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    90 HP 4 stroke Mercury is not firing on the 2 bottom plugs

    I have a 2005 90 HP carbureted mercury that's not firing on the 2 bottom plugs. New plugs and wires. Could the coils be bad or the ecu be bad?
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    2005 Mercury 90 HP 4 stroke cranks but won't stay running

    I have a 2005 90 hp Mercury 4 stroke carbureted engine that won't stay running. I have cleaned all of the carbs , installed new plugs and have hooked up fuel supply from a separate fuel tank. The engine runs for a few minutes and shuts off. It does have a little bit of a rough idle. I can put...
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    2006 DF 150 Suzuki VST leaking fuel out of overflow hose into engine

    My 2006 DF 150 Suzuki engine is over flowing some fuel into my engine. I cleaned the vst tank and replaced the float needle and seat. I ran a clear tube from the vst tank overflow to a plastic bottle while running my boat today. When I got home there was about a 1/2 ounce of fuel in the plastic...
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    2005 DF70 Suzuki VST tank has constant power

    I have replaced 2 HP fuel pumps on a 2005 DF70 Suzuki. The last one I replaced I also had to replace the top part of the vst tank. The plug looked like it had shorted out. I checked the plug going to the vst tank and it has a constant 12 volts. I thought it was only supposed to have power for a...
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    2004 Df 70 Suzuki 4 stroke crankcase getting extra level of oil

    My Suzuki df70 had 6.5 quarts of oil in it when I drained the oil.. Only 5 hours on motor since last oil change. The oil was real thin almost like it had gas in it. Also the vent pipe from the crankcase has to be off before the motor will Idle smooth.. Check engine light came on 3-1...
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    2004 DF 70 Suzuki 4 stroke lowerr unit shifter seal replace

    I have attempted to change the lower unit shifter seal on my 70 HP 4 stroke Suzuki engine. I have the 3 bolts out of the shifter housing. I have the housing loose but it won't come off. I lift the housing up but it goes back down like its got a spring or something under it.. I don't want to...
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    Old Tach works fine but new Tach don't work 140 HP Evinrude Looper

    I have 2 140 HP Evinrude loopers 1989 year I think on my boat. One engine the tach works (starboard)on but the other engine the tach don't work.(port). I've changed the rectifier regulator.. Not getting any pulses from the gray wire on the port motor.. I have hooked the tach up at the motor to...
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    Tach not working on 140 HP Evinrude looper

    I have replaced the rectifier with 2 used ones and the tach still don't work.. I have 2 motors so I took the working tach and hooked it up to the motor that the tach didn't work.. It still don't work.. I have verified that both tachs are good but don't know if my rectifiers are good or not. I...
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    Suzuki 40 HP 4 stroke won't start

    I have a 2003 suzuki 40 HP 4 stroke that won't start. When I turn the key to the on position the buzzer don't come on but the engine will turn over.it acts like its not getting any fire.
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    40 HP Suzuki 4 stroke 2003 won't start

    My motor will turn over but won't start.The buzzer won't come on either. I removed the ECM relay and jumpered out one side of the plug and the buzzer came on and the engine started. Is there any way to test the ECM relay? Also 3 of the terminals on the relay plug shows 12 volts and the other...
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    70 HP Johnson will not start

    I have a Johnson 1993 70 hp outboard motor that will not start. It don't appear to have any fire at the plugs. Is there some way I can bypass the switch, shifter and kill switch to make sure these things are not holding me out from starting? Or any other idea will be greatly appreciated...
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    Rough Idle on 1998 200 HP Johnson

    My motor when slow trolling runs rough. The radio box even vibrates and shakes. The motor runs good any other time except when at idle speeds of 500 -900 rpm's. Any help on this problem will be appreciated.
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    Rough idle

    I have a 1998 Johnson 200 HP ocean runner. When i'm slow trolling the motor don't run smooth. My radio in the radio box vibrates along with everything else in the console. What could be causing this problem. My wife says it sounds like the boat is getting ready to fall apart..
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    Tilt & Trim not working

    I have a 1998 Johnson 200 HP. The motor will tilt down but will not tilt up. I have changed both trim relays and it still don't work. The trim switch on the shifter and the one on the motor seem to be ok. The wiring connections also seem to be ok unless i'm missing one somewhere..I'm out of...
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    1994 15 HP Mariner

    Does anyone know what a good price is for a 1994 15 HP Mariner motor. I have found one and it looks brand new and has only 4 hours on it.Its a tiller handle with manual start 20 inch shaft.The guy is asking 850.00 for it..
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    Low rpm's 90 Yamaha

    Thanks Rodbolt for sending me to a real mechanic. I had my 2004 Yamaha 2 stroke 90 HP motor dyno tested like you told me to do and it tested good. The service man at Page's Creek Marine told me that the motor ran perfect but the prop which is an after market ss prop looked to be to big, the...
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    Low Rpm's

    I have just purchased a 2004 90 HP yamaha 2 stroke. At wot I can only get 4200 rpm's.The prop is a SS 17 inch . What is a recommended size prop for this engine. My boat is only 17 feet long and weighs approximately 600 lbs.
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    Lower Unit Jumping out of Gear

    1998 Johnson 200 HP. My mechanic says that my lower unit is jumping in and out of gear. How does this happen at 4000 rpm's? The motor sounds like its back firing through the exhaust when i'm running but the Johnson mechanic says its jumping out of gear.He also said he has adjusted the linkage...
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