While a fuel system problem may make it impossible to start an the engine, outboard cooling system problems have the potential to destroy an otherwise healthy motor as overheating can lead to a blown cylinder head gasket, or even complete seizure of the engine. Checking Compression On An Outboard Engine. The Theory of Air-leaks. Our Yamaha Outboard Head Gaskets are at the lowest prices and same day shipping!. Bear in mind that not all leaks are visible, so if the vacuum lines are hard to the touch, it is more than likely that air is leaking past the joint or connection. The ignition coil is the source of the spark that ignites the air-fuel mixture in the engine's combustion chamber. The engine ran like a top until a few weeks ago. Testing For Vacuum Leaks. Contact Supplier. Find Optimax 25hp Stroke for sale. Outboard Motors service and repair manuals. I have a 2013 Suzuki 250ss on 2013 BlueWave Purebay, about 200 hrs on it. Could I spray some carb cleaner around the carb flange like you would on a 4-stroke to see if it's sucking air there without damaging the motor. The Repair Clinic troubleshooting system was designed to help you with small engine repair, starting with accurate diagnostics. 2 strokes use the oil in the gas to lubricate the lower end of the motor,as well as the cylinder walls,and rings. Having recently purchased a new external tank and had it, and its immediate successor, leak because of faulty construction, I am a convert and store our external fuel tank in the dinghy-with the its pressure relief valve cracked open. Parts were excellent. Purchasing these together will save you money over purchasing components individually. Also, Keep in mind that these symptoms are not exclusive of a vacuum leak; A bad EGR valve; Poor compression; Ignition timing problems; May cause one or more of these symptoms as well. Outboard Stalling. This season and last, I cleaned the plug (new plug) drained the old fuel from the tank and the carb and refuelled with new fuel, mixed about 80:1. Unlike all 4 cycle engines, the two cycle engines in all two-stroke engines must have a completely air tight lower end. A download JetSki repair manual is a book of instructions for learning how to maintain, service, troubleshoot, and overhaul the waverunner to factory specifications. A few hours later it was still running rough at idle, then stalled altogether when I punched it, and was done. While a faulty intake manifold gasket will produce symptoms that quickly alert the driver of an issue, there can be instances where a leak is difficult to detect. I have a 2013 Suzuki 250ss on 2013 BlueWave Purebay, about 200 hrs on it. The leak can result in air that is not properly measured entering into the engine. How exactly does a two-stroke leak d. New 2 Stroke 3. If a vehicle is behaving intermittently and is giving its driver some trouble in a smooth driving, then it could indicate that the ignition coil of that vehicle has gone bad. There are various signs and symptoms of vacuum leaks, some subtle and others not so subtle. A 2-CYLINDER 25 HP YAMAHA OUTBOARD 1. We installed a new water pump impeller, pressure and vacuum tested the lower unit, filled with new gear lube. Plus it's a lot lighter. One of the vacuum leak's signature symptoms is that it seems to go away under full throttle conditions, particularly at high rpm. What happens when initially starting a 2 stroke with leaking rings is when the piston is going up it creates a low in the crankcase drawing air and fuel into it. We aim to cater for a wider range of tastes here from Hot Rods & Street Rods all the way through to Bikes and Trucks. While you cannot get a torque wrench at all the bolts,you can get a feel for tightness with a regular box wrench. One obvious sign is a loud hissing sound under the hood, sometimes accompanied by a whistle during deceleration. Fix the leak. Like I said before, if there was evidence of a vacuum leak (stalling, high, unadjustable idle) then of course that would be the first place I would look. Find 2 Stroke Controls Earlier for sale. Symptoms: Blistered, white insulator, eroded electrode and absence of deposits. Maintenance on these engines is relatively straightforward, and many of them sit for an entire off-season without being started. Rough or noisy starts and stops. The normal vacuum in the 2 cycle engine's lower end will draw a mixture of fuel and air from the carburetor though the intake manifold. Outboard Stalling. Often, bikes will develop intake leaks from a rubber hose that was run to actuate an item, but the hose deteriorates. This is my very first outboard/boat, so Im not sure what to expect. know that spring is a pain when the cable is worn a lot too. Can a bad crank seal cause rough idle in a mercury outboard boat motor I have a 1982 9. It is imperative that you establish a solid baseline with proper assembly and an air leak free engine. The most common symptoms of a vacuum leak are rough/high idle, misfires and a check engine light. Mercury Outboards – Durable. Manuals contain step-by-step repair procedures, illustrations, pictures and advanced troubleshooting. I have Been tracking down a fuel problem on a 03 yamaha 115 tlrb. Rich fuel mixtures resist detonation while lean ones do not. One of the symptoms of leaky fuel line is that the engine does not start as soon and may stop in the middle. Can a bad crank seal cause rough idle in a mercury outboard boat motor I have a 1982 9. Air leaks can disrupt the way the engine works so it is important to replace the gasket if you notice symptoms such as rough or erratic idle, then it is best to replace the gasket. What is the function of the outboard carburetor? The outboard carb has a number of functions that make it a vital part of your boat. Buy and Download COMPLETE Service & Repair Manual. Download a 25HP Yamaha, Suzuki, Evinrude, Mariner, Johnson, Mercury outboard repair manual in seconds. 24 0586544 438081 Vacuum Switch Kit for Evinrude Johnson Outboard. 9 HP two stroke stalling at low idle merc 9. 8 merc that just started running rough. half way between those two spots is where you want it. The piston rod turns the crankshaft, converting the back-and-forth (reciprocating) motion of the piston into round-and-round (rotary) motion. It threw a rod. If the seal on this side goes bad, you’ll get air leaks. Re: Testing 2 stroke crankshaft seals. A blocked outboard fuel line prevents fuel from getting to the motor. Finding a Vacuum Leak in an Outboard Motor In this video I investigate whether the Yamaha 20 HP has a vacuum leak causing it to go lean I do this by spraying LPG over the crank case and then also blocking off the exhaust and doing a pressure test on the crank case. The motor is dying for no reason mainly after a long idle in no wake zone I goto get on plane and it dies. All models, and all engines are included. But the symptoms are not consistent with an air leak, but with a carb that is in need of adjustment. Best THERMOS NISSAN JMQ400P 14-OZ STAINLESSSTEEL VACUUM INSULATED LEAK-PROOF TRAVELMUG WITH CARABINER - 2. of compression. Know your Options for your lower unit!Speak …. it can cause any number of problems including powerpack failures, dead batteries, intermittent and weak spark. The symptoms point towards the carbs. Marine Engine Diagnosis How to Doctor Your Outboard Inboard or Stern Drive Marine Engine. Injection oil pumps. I think a powerloss would be very noticialbe with leaking head gasket as when the piston comes up past the exhaust port and starts compressing the fuel/air/oil mixture from the carb you are going to have lower compression because of the leaking head gasket. Thanks Crowley. Most outboard motors are petrol-driven, two-stroke engines although four-stroke engines are becoming more common. We Flow , Test and Service all Outboard / Marine Fuel Injectors. Reassembly (Design 1 and 2) Disassemble by removing 2 hex-head bolts; remove/disassemble fuel pump parts. Injection oil pumps. Maintenance on these engines is relatively straightforward, and many of them sit for an entire off-season without being started. Have a problem with my Mercury 40HP outboard motor. The Vacuum that a motor produces comes from the intake stroke of the motor where the crankshaft draws down the piston and air is pulled or “sucked” into the motor. If you hear sputtering, then you know that there is a leak somewhere. Four-stroke dirt bike oil comes in a variety of weights like 10w-40, 20w-50 and so on. Remove the 2 nuts that hold the carburetor on. Second reason is the age of the impeller. If you are having problems with the charging system, you may need to test the rectifier for functionality. It mixes fuel with air to create a suitably combustible blend. Any coolant leaks should be addressed as soon as possible to prevent the possibility of serious engine damage occurring due to a bad intake manifold gasket. Record your outboard motor serial number in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or for reference in case your outboard motor is sto-len. This kind of piston damage can also be found on a saw that was run with the carburetor set too lean or one that was run with an air leak. Bore wear creates a loss of governor pressure, which affects shift timing. Open the tap no more than about one-quarter of maximum water pressure (full water pressure from a city water system could damage the internal seals in your outboard motor). Choke it a couple of time and it will re-start and run awhile, then quit. The problem goes back to motors built before that time, yammie has an ISSUE with this balancer and they know it. Download a 90HP Yamaha, Suzuki, Evinrude, Mariner, Johnson, Mercury outboard repair manual in seconds. It is most noticeable at idle and low speed. Choke knob 12. If an inspection of the dipstick shows the oil to be bubbly, watery or chocolate milk-like in appearance, the engine is indeed showing symptoms of a blown head gasket, the likes of which could be due for emergency maintenance. I got it changed there a few months ago and shortly thereafter my car started to overheat and the heater stopped working. A little too rich is better than too lean. If you didn't know this saw had been run with no oil in the fuel, how would you know it wasn't a heat seizure? To fully understand the cause of this failure, it is important to look at the rest of the piston. If the rings aren't sealing (or the crank seals are worn, or a leaking barrel gasket, or the crankase itself) not all of the "mixture" in the crankcase that will end up being burnt in the cylinder has come from the carburettor, meaning a weak or lean mixture. What happens when initially starting a 2 stroke with leaking rings is when the piston is going up it creates a low in the crankcase drawing air and fuel into it. Any leak in the air hose, fuel tank (around screws), tank cap or pressure relief valve (46) will release pressure. Yamaha does not recommend gasohol containing If the recommended engine oil is not avail- methanol because it can cause fuel system able, another 2-stroke engine oil with an damage or engine performance problems. From 1998 to about 2004, they installed a tempermental engine made by Rotax in a line of high performance watercraft. In the 1890's Joseph Day designed the lightweight 2-stroke engine where the crankcase is used as a pumping chamber for the fresh mixture. The piston creates a vacuum in the cylinder above it, and this suction sucks the air in through the carburetor. Jon Boat 14' with 15hp Outboard - $2250 (Mebane, NC) 14' Jon boat for sale with trailer. I've got a bad, bad feeling about this. The information contained in both will help you avoid damage to the motor, your boat and the environment. Not Running - Revs high then dies. For those of you modifying your engine, I think it makes a lot of sense to make sure your engine is in top notch shape before spending money on modifications. When the concentration of water molecules in your fuel tank reaches just 1⁄2 of 1%, the water molecules will bond with the alcohol and sink to the bottom, where your fuel pick up is. In some cases it may only happen under certain conditions, for example only after the mower gets hot, or only when the fuel level gets low. To perform a compression test without a compression gauge, turn the outboard over by hand (utilizing its recoil start at normal starting pull speed), and gauge the amount of bounce you feel as each piston passes top dead center (TDC) position of its stroke. The fuel line assembly can get old after some years of use, may deteriorate, get cracked and can start leaking the fuel. I was in the outboard repair business for 17 plus yrs certified by merc,omc and yammie. 2 is the fact that they have fewer moving parts, which decreases the constant load on the engine, allowing it to burn the air-fuel mixture more efficiently, and reach. There's a good thread or article on eric gorr's site about this. The leak can result in air that is not properly measured entering into the engine. 99 821371A2 Mercury Mariner 30 40 Hp Outboard 2 Cyl Induction Manifold 1994-2006. Evinrude that runs for five minutes at times, then just quits, may run more or less than that then quits. All that is needed is a quick shake, and you are ready to go. Allow the motor to run up to operating temperature, so the thermostat will open and allow water to circulate through the cooling system. If there is not enough compression, the engine will fail to start. IMPORTANT: If the boat is to be water tested, the operator should be familiar with the operation procedures in the Operation and Maintenance Manual. 1981 75 hp Evinrude has some two stroke oil from the fuel oil mix dripping from the lower unit at the prop, no fuel just oil. Carb is a very typical Japanese made 2-stroke carb with the idle-air low speed jet circuit on the right side of the carb. Easily find the parts you need using our free online parts catalogs. Oil Service including filter ~ Fuel Filters ~ Spark Plugs ~ Anodes as Needed ~ Replace Timing Belt & Belt Tensioner ~ Oil Change ~ Fuel Service (VST Filter, High Pressure Filter, Re-manufactured or New Fuel Injectors) ~ Replace Impeller, Plate & Housing ~ Lower Unit Flush & Fill w/Synthetic Fluid ~Inspect Steering System for leaks. Boat Parts For Repair. Since two stroke engines work both sides of the piston, air leaks at either end have an effect on fuel ratios. Feed your outboard a steady diet of clean, high-octane gasoline. They always loosen up for me. Have a problem with my Mercury 40HP outboard motor. This caused problems like fouled spark plugs and plugged mufflers. Included in each Purchase: 1x 1-109 1x 3-144 1x 3-138 1x 3-101. But as time goes by, watch out for NO smoke! The auto-oiler can fail. My 87 Mercury 35 now runs great and has no water leaks. Cylinder 4 is much stronger than 1, 2, and 3. Guys maybe you can give me a little help before I take this motor into the shop. Four-stroke dirt bike oil comes in a variety of weights like 10w-40, 20w-50 and so on. A vacuum leak tricks the air-fuel meter and will result in a lean mixture; A vacuum leak tricks the throttle body and will result in a high/low idle RPM. I have Been tracking down a fuel problem on a 03 yamaha 115 tlrb. Manifold Absolute Pressure MAP Sensors. Since two stroke engines work both sides of the piston, air leaks at either end have an effect on fuel ratios. Another sign and symptom is a rough idle. When an engine failure occurs, the piston is likely to take the brunt of the damage. While this particular boot was not cracked all the way through, it was replaced as preventative maintenance. Before operating a Honda outboard motor, read and understand the owner's manual and warranty policy. ) Symptoms of an engine vacuum leak include: check engine light, low idle, high idle, poor acceleration, cylinder misfire and stalling at idle. The less-common item is a cracked vacuum hose. Other Leaks Coolant and air leaks can develop at the head and base gaskets or at the airboot and manifold. Mercury Marine is an international motor boat company based in Lake Forest, Illinois, providing motors for private, commercial and government craft. Before operating a Honda outboard motor, read and understand the owner's manual and warranty policy. Lead Fouling. The condition of the engine is determined by measuring the degree to which a cylinder with valves closed leaks air. Parts were excellent. Have you ever tried to tune an engine only to find it won't idle or run right? Or have you ever been confronted with an engine that just doesn't seem to run right no matter what you've done or replaced? You may be dealing with an engine vacuum leak. I have a 4hp 2 stroke mercury short shaft outboard, 2003 model. Upper Valve Body No. test kit for testing crankcase pressure & vacuum leaks in 2 stroke chain saws, trimmers, blowers 2 stoke equipment, must use a vacuum/pressure pump with the rubber block offs and adapter, note: the adapter supplied are 10mm &14mm, be sure to check out my ebay store for more parts and accessories. If you just use your eyes and ears to find the leak, it will. 2 12 10 6 11 24 21 20 25 15 0 10 5 30 VACUUM TEST See page 3 for test area IDs, transmission symptoms and recommended repairs. A wonderful vintage sign for a gas station near the water. I have a 2004 yamaha 60 hp 2 stroke buzzer would go off troubleshooting yamaha 4 stroke motors eric s outboard motor yamaha oil tank ion boating and boat fishing surftalk 5 mon oil pump failure symptoms doityourself tilt and trim troubleshooting for your outboard southernHelp Yamaha 2 Stroke Oil Reservoir Issue The Hull TruthYamaha […]. To perform a compression test without a compression gauge, turn the outboard over by hand (utilizing its recoil start at normal starting pull speed), and gauge the amount of bounce you feel as each piston passes top dead center (TDC) position of its stroke. If a reed is broken, fractured, or missingit is like having a hole in your engineand fuel cannot be properly delivered to the affected cylinder. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury-Mariner, Johnson-Evinrude, Suzuki, Honda, Yamaha 90 horsepower outboard engines were designed primarily for factory service 90 horsepower outboard technicians in a properly equipped shop. This kind of piston damage can also be found on a saw that was run with the carburetor set too lean or one that was run with an air leak. Exhaust Fumes. The symptoms are changing. A carburetor is a carburetor - if you're comfortable w/the carbs from your old 2-stroke outboards, this one shouldn't be a problem. That means twice the power strokes of a 4-stroke. 42 Wooten Cove Road Suite 2 Weaverville, NC 28787 · USA. To perform a compression test without a compression gauge, turn the outboard over by hand (utilizing its recoil start at normal starting pull speed), and gauge the amount of bounce you feel as each piston passes top dead center (TDC) position of its stroke. Model name F115AET LF115AET, USA and Canada name F115TR LF115TR. Block valve outboard with. If you are having problems with the charging system, you may need to test the rectifier for functionality. Electric High Pressure Fuel Pump for Mercruiser Mercury Mariner and Yamaha Outboards with Filter Fits the following motors: Mercruiser: Used on Mercruiser 4. Domestic V-twins suffer intake leaks, too, but usually for different reasons. Optimax 115 Outboard Motor pdf manual download. Fuel and Oil Pump Fuel Pressure Gauge Fuel Filter Fuel Vacuum Gauge Clear Fuel Line Carburetors Fuel in. Other possible causes could be low compression, vacuum leak, overly retarded timing, or improper spark plug heat range. Check out the. Check the carb fittings (at the air cleaner and manifold). Story And Photos By John Tiger. Grateful for thoughts on the following. Engine pistons create vacuum on their downward stroke which allows the air/fuel mixture to be delivered into the combustion chamber. The procedures listed below will help you correctly diagnose a low speed miss caused by a vacuum leak, burned intake or. This Texaco sign is in great condition and was never used. Your description sounds like fuel-starvation at idle. I want to make this a DIY YZ250 Leak down tester thread. It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. A leak down test will pinpoint exactly where the two-stroke engine is leaking. Reference to a shop a manual will list the correct rpm to set the idle to when vacuum balancing (typically around 1800 rpm). To perform a compression test without a compression gauge, turn the outboard over by hand (utilizing its recoil start at normal starting pull speed), and gauge the amount of bounce you feel as each piston passes top dead center (TDC) position of its stroke. I have changed the fuel filter due to the old one looking very bad. Vapor lock is the bane of summer for boaters. Southcentral Outboards 4 North Main • Altamont, IL 62411 Website Built By. Parts of an outboard motor's fuel system are cooled or vented to prevent or break up the bubbles in fuel lines that cause vapor lock. Ok now big difference in a BACKFIRE and POPPING sound, a backfire is just that sounds like a gun POW POW, POPs is just that it makes a POPS sound or a BRAT sound so you have to tell me which one it is and WHEN IT does it, WHEN YOUR ON the throttle or LET GO of the throttle. INSTALLATION MANUAL 75, 90 AND 115 HP (4-Stroke) NOTICE TO INSTALLER: After completing assembly, these instructions should be placed with the product for the owner’s future use. 1968 For Sale. Yamaha 115 2 stroke fouling plugs at idle; A 115 hp Suzuki outboard I also had was the same way with the smoke and oil pressure. Having a leak down tester is very useful for diagnosing any leaks on a two stroke and you will use it often enough to justify making it. There's something wrong in the fuel system IMO. We all know about taking engine compression readings from the spark plug hole but a lot of people seem to forget that a two stroke engine must have a sealed bottom end that will hold both compression and vacuum. This threaded cap had a float and two wires connected and I traced them to their connectors and wala , fixed. Find blade outboard y132519la available for buying now. Turned it off for a few minutes and it started hard. One of the vacuum leak's signature symptoms is that it seems to go away under full throttle conditions, particularly at high rpm. Contact Supplier. Mercury Outboards – Durable. Clogged fuel injectors does not need to be replaced. Get the best deal for Mercury Boat Outboard Intake and Fuel Systems from the largest online selection at eBay. When an engine failure occurs, the piston is likely to take the brunt of the damage. New 4 Stroke Mercury Outboard Fuel Pump Issues the only way i know they are stuffed they would start leaking either from the back of pump or fill your oil sump up. Rough or noisy starts and stops. Tiny amounts of raw fuel also leak into the crankcase on the compression stroke, potentially diluting the oil and raising the level on a cool-running motor. The seal on the magneto side (left side) prevents air from getting into the combustion chamber. The internal throttle linkages on the Honda outboard motors are all mechanical pushrods & bellcranks with no cables to kink or bind. What are the likely causes? What should you check first? Second? Third? It doesn’t matter what brand of outboard you have or whether it’s 2-stroke or 4-stroke. This causes a loss of reed petal reaction and reduces the consistency of peak horsepower. The fact that you are losing coolant says that there is definitely a leak within your cooling system whether it be a bad head gasket, leaking heater core, leaking freeze plug(s), or a cracked block. Just a thought. Also Permatex type 2 is a little (lot) thicker and helps with some warpage. 9hp 2 stroke that ran very well all summer. Osgood Company for RV and Upper Midwest Marine Sales Representation Oct 4, 2016 Balmar Welcomes Frank Ahlbin To Lead Sales & Marketing Jan 1, 2016 Balmar Announces AltMount® Patent Award and Price Reductions. It was a hot (90+ F) day. EXAMPLE With the speed screw set at no more than (1 1/2) turns in after contact with the stop lever; and the best idle occurring with the mixture screw set at 3 turns from bottom, indicates the need for a larger Idle jet. Checking Compression On An Outboard Engine. Oil leaks are the most common symptom of a problem with the crankshaft seal. The Theory of Air-leaks. Buy 8MILELAKE 21pcs Handheld Vacuum Pump Set Tester Compatible for Automotive with Adapters Brake Bleeder Test Kit: Brake System Bleeding Tools - Amazon. The Mercury Outboard Repair Manual is a comprehensive guide for Mercury/Mariner Outboard models as it lays out all the service procedures for DIY enthusiasts and mechanics. I was also curious in your first post why you thought it acted like it was running too rich rather than too lean. Symtoms caused by leaking REGULATOR DIAPHRAMS point to: Bad Injectors Bad Fuel Pumps Leaking VST Air in Fuel Lines Bad Gas Bad TPS Rubber Regulator Diaphrams dry and crack because of today's fuel content. So, your outboard won't start. Browse props, boat stabilizers, boat gas tanks, gauges & controls, motor oils & much more at basspro. Clogged fuel injectors does not need to be replaced. It kinda sounds like you are still riding the bike with a leaking head gasket. That upsets the balance and the result can be the automobile having some difficulties. Starts cold fine. 1956-1989 90-300 HP Mercury Outboard motors repair manual Application: Covers all Mercury Motors from 1965 to 1989 90-300 hp Inline 6 and V6, 2 stroke models fuel injection and MR Drive: 90 95 100 115 125 135 140 150 150XR2/150 HP 155 HP 175 HP 200 HP 220XRi/200 HP 225 HP 275 HP 300 HP 850XS/90 HP, 4cyl 900/90hp, 6cyl 950/95hp, 6cyl 1000/100hp. Related Questions. But blockages don’t cure themselves. ), for cracks and/or holes. Since the carburetor was recently removed, I would check the flange gasket to make sure it isfitting as it should. When I first turned it over, I had. Contact Supplier. If you didn't know this saw had been run with no oil in the fuel, how would you know it wasn't a heat seizure? To fully understand the cause of this failure, it is important to look at the rest of the piston. Effective Method to Clear Flooded 2 Stroke Crankcase? #2 You didn't say if it ran good before this, or what year it is, or what recent work was done, compression test result, was the plug wet, so I'll assume it did run prior to this. Mercury Outboards – Durable. If 2 cycle won't hold vacuum then pressurize crankcase and submerge crankcase in some liquid like parts solvent and look for bubbles. Also if I accelerated to quickly it would act very sluggish. Reassembly (Design 1 and 2) Disassemble by removing 2 hex-head bolts; remove/disassemble fuel pump parts. Well that is not your diaphgram. Electric High Pressure Fuel Pump for Mercruiser Mercury Mariner and Yamaha Outboards with Filter Fits the following motors: Mercruiser: Used on Mercruiser 4. Honda used two basic types of carburetors, CV and slide both made by the Keihin company. This is how to do a cylinder leak down test. Outboard Motors. Finding a Vacuum Leak in an Outboard Motor. Inspecting Outboard Motor Reed Valves; Inspecting Outboard Motor Reed Valves In this video I take the reed valves out of the Yamaha 20HP 2-stroke to see if they are damaged and causing a lean running condition. It also controls the speed of the engine. 1 is the displacement, they generally have smaller combustion chambers, which means less fuel burned. For 2 stroke engines, you must mix the proper amount of the correct 2 stroke engine oil (outboard motor oil or whatever is recommended by your engine's manufacturer). 880890T1 Mercury Mariner 75-115 Hp 4 Stroke Outboard Fuel Pump. While you cannot get a torque wrench at all the bolts,you can get a feel for tightness with a regular box wrench. I have Been tracking down a fuel problem on a 03 yamaha 115 tlrb. The motor will run but I need to manipulate the choke to keep it from stalling. If an exhaust valve leaks during engine operation maverick air is drawn into the combustion chamber causing a lean air-fuel mixture. generally a 2-stroke will run with 90 lbs. Electronic ignition conversion upgrade kits to replace contact breaker points in 2-cylinder Marelli non-vacuum-advance distributors, Fiat 500, Loop-Frame Moto-Guzzi Motorcycle V700, Ambassador, Eldorado. (Horsepower - Horse Power) Outboards Marine Engine Johnson/Evinrude 2Stroke 2-Stroke Two Stroke & 4Stroke 4-Stroke Four Stroke models. The engine's idle speed is usually the first indicator of a manifold leak, preventing the engine from starting or creating an erratic engine idle speed that shifts between 500 to 2,000 rpm. A wonderful vintage sign for a gas station near the water. 6hp Heavy Duty Outboard Motor Boat Engine Wwater System Us Stock. Oil injection is a nice convenience and offers some performance advantages over a straight 50:1 ratio (or as recommended by your Outboard Manufacturer) especially if trolling for extended periods. The leak can result in air that is not properly measured entering into the engine. Take the exhaust pipe off of the head, and ride it around for a few minutes. Outboard Motors. Depending on the amount of water ingested into your outboard, this can result in everything from running problems to catastrophic damage. How to Find a Vacuum Leak Air leaking into your car—not out of it—can be a problem. Outboard Spares Blog - Troubleshooting 2 Stroke Ignition Industrial output growth sputters at 2%, rate cut likely on Why Your Boat is Beeping and What it Could Mean. The plugs on the left would be OK for a 4-stroke, but in a 2-stroke they are lean, hot, and dangerous. Leaving a petcock vacuum line off can create a lean condition on 1 cylinder but normal on the rest. So after even a few weeks the lighter molecules evaporate leaving behind sticky fuel that gums up carburetor float bowls and clogs the narrow jets and passages. 42 Wooten Cove Road Suite 2 Weaverville, NC 28787 · USA. Yamaha Outboard Service Manual, Repair Manual, Shop Manual, Owner’s Workshop Manual, Engine Repair Guide, Handbook, Book, Learning Guide, Study Guide, Factory Engine Rebuild Manual 1998-1999 98-99 40HP (40-HP) & 50HP (50-HP) 40W 50W Yamaha Marine Outboard 2-Stroke LIT-18616-01-81, LIT186160181, 186160181. Failure of the Water PumpOne of the most common reasons behind overheating in outboard motors isfailure of the water pumps. an Outboard Motor Carburetor Rebuilding an Outboard Carburetor Step-By-Step. I bought a 1990 Mercury 25 hp outboard motor and started it for the first time today. I removed the carb and had it rebuilt for an external leak at the intake area, put it on and ran good but with an engine firing miss. 17 Block valve outboard with. This INSTANT DOWNLOAD 8 horsepower Mercury, Mariner, Yamaha, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. Like I said before, if there was evidence of a vacuum leak (stalling, high, unadjustable idle) then of course that would be the first place I would look. On 2 stroke dirt bikes, there is a rubber seal on either side of the crankshaft. It kinda sounds like you are still riding the bike with a leaking head gasket. 1968 For Sale. 2 24 15 19 Seal port on back. 880890T1 Mercury Mariner 75-115 Hp 4 Stroke Outboard Fuel Pump. Any ideas of what this could be??. Long bolts,many gaskets and covers. † denotes indent items. These injectors are provided with a constant supply of fuel delivered to the fuel rail. It is most noticeable at idle and low speed. DOWNLOAD 2004, 2005, 2006 Yamaha Outboard 115HP 115-HP Service Manual 4-STROKE Service Repair Manual Application: 2004, 2005, 2006 Yamaha Marine Outboard 115HP (115-HP) 4-Stroke Engines. Anybody have Erin Brockovich's cell number?. know that spring is a pain when the cable is worn a lot too. Remove the vacuum modulator hoses from the VRV; install a vacuum gauge on the lower (output) port and a vacuum pump on the upper (input) port. such as ultrasonic cleaning. If there is a leak anywhere in this connection you will lose prime (or vacuum as I said before) and the motor will stall out. When I first turned it over, I had. Also for: Optimax 135, Optimax 150, Optimax 175. Common Symptoms of a Leaking Aortic Valve. Depending on the amount of water ingested into your outboard, this can result in everything from running problems to catastrophic damage. Carefully examine this joint all the way around the engine. The symptoms run the gamut from mild detonation to terminal piston-to-cylinder-wall scuffing. It mixes fuel with air to create a suitably combustible blend. Finding a Vacuum Leak in an Outboard Motor In this video I investigate whether the Yamaha 20 HP has a vacuum leak causing it to go lean. Outboard Stalling. Re: Is your 2-stroke BACKFIRING? This could help good to know did a rebuild and was at a loss for parts to replace with something major, was thinking a bad install but knew myself better than that. Look for signs of metal discoloration or buildup of black deposits as these can indicate places where the head gasket is leaking. This check valve or the fuel tank vent is connected to the fuel tank in the following products: hedge trimmer, leaf blower/vacuum, chainsaw, edger, engine, tiler, auger, water pump, chipper shredder, sprayer, and brush cutter. From the symptoms. 327229 Evinrude Johnson 2. The seal on the magneto side (left side) prevents air from getting into the combustion chamber. You may have to register before you can post: click the register link above to proceed. Overheat warning lamp 13. 2 Stroke; 4 Stroke; Suzuki Suzuki. Vacuum Regulator Valve--C-6 Remove the throttle cable and return spring. The following is a summary of the symptoms, causes and corrections from section workshop manual page 24 - 21. What are the main symptoms of a leaking head gasket on a 4 stroke dirt bike engine? Update Cancel. This will repeat a number of times and then will run ok untill I get to where I am going. In just 3-5 minutes you can know if an engine is healthy or not. Their primary function is to deliver the right amount of fuel/air mixture at a given throttle opening (as selected by the rider). The symptoms point towards the carbs. At idle, fuel pressure regulator 2 is used to maintain the desired fuel pressure. Rough or noisy starts and stops. You build 29 inches of vacuum, just not quickly enough to keep up with several applications of the brakes. A 2-stroke engine requires a properly sealed block to run right because it uses the crankcase vacuum created from the rising piston to pull the incoming charge into the crankcase; the downward stroke of the piston pressurizes the charge, pushing it into the. Follow the Maintenance Schedule recommendations to ensure that the motor is in peak operating condition and the emission levels are within the standards set by the your states/county Resources Board. thanks for the indepth post manfunsalow. 2 Stroke Engine Troubleshooting - Air.