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  1. 9

    Pretty sure I found at least one of the leaks.

    with the cowling off, listen and visually check to see if anything happens when you push the key in. may be those 2 devices on the carbs 1& 3 operate when pushing the key, but that is not the way the prime start works on my C40 2 stroke. just because you can push the key switch in does not...
  2. 9

    Pretty sure I found at least one of the leaks.

    also running too rich or too cold will cause fuel to get in oil, because not all fuel is being burned in the cylinders it leaks by the rings. rea dup on motors making oil and what causes it I mentioned this prime start system to you in one of your other threads you started on this motor...
  3. 9

    Pretty sure I found at least one of the leaks.

    you need to think about what could cause all 4 cylinders to run rich. prime start system not shutting off, or someone has jacked with the carbs and have wrong settings or wrong jets is all I can come up with
  4. 9

    Pretty sure I found at least one of the leaks.

    a 2 stroke fuel pump gets its pulse from the crankcase itself, if there is a leak in the diaphragm, that leaking fuel hits the crankcase and is sucked into the combustion chamber of the cylinder that delivers the pulse to be burned with the other fuel. I do not see how that would hit all...
  5. 9

    Pretty sure I found at least one of the leaks.

    so, have you verified the fuel pump is leaking and is the problem. or just guessing again? I do not see how a 4 stroke would run too rich if the pump diaphragm leaked. a 2 stroke yes I could see that happening, but not a 4. how is the fuel getting into the combustion chambers?
  6. 9

    Pretty sure I found at least one of the leaks.

    what are you calling a coil pack? maybe the CDI? and how did that cause all plugs to be black?
  7. 9

    Suzuki DF175 year: 2013. Tilt goes up to stop limit without touching control button!

    has to be a short in the cable/harness
  8. 9

    Nervous and anxious

    fire it up and see if it needs more attention
  9. 9

    Pretty sure I found at least one of the leaks.

    OK I will bite, what are you trying to show us a a leak?
  10. 9

    Yamaha 8 HP 4 stroke oil collection in cowling, housing

    clean up the motor, put oil back in, run it, and look for where the oil is coming out at
  11. 9

    Yamaha F300 Cylinder Head Pressure Testing

    never even heard of this before. why would you need these plates?
  12. 9

    2003 yamaha 50 4-stroke runs rough

    YAMAHA OEM PRIME STARTER | 62Y-14380-10-00 there is one on #1 and #3 carb they add fuel to the cold motor and should shut off the extra fuel as the motor warms up. at least that is how the unit on my C40 works
  13. 9

    2003 yamaha 50 4-stroke runs rough

    how many of the plugs are black, and if not all of them which ones are black? sounds like too rich to burn properly, not sure it that could be from spark timing not firing plugs far enough advanced or not. never seen that before. make sure the prime start systems are functioning properly. is...
  14. 9

    Question before I start tearing apart carburetors.

    you can guess at things for as long as you want. taking reading proves if something is in spec or not. do you even know what controls the timing on that motor? or do you have a service manual? On my 1999 C40TLRX the CDI does it electronically. It had a problem with timing, and I had to buy a...
  15. 9

    Question before I start tearing apart carburetors.

    spark timing can be seen with a timing light. if the timing does not advance when the throttle is advanced the motor will not burn the fuel properly, so there is not the proper power. your service manual will have the specs, and it will also tell you how to check the cam timing
  16. 9

    Question before I start tearing apart carburetors.

    my troubleshooting starts with good compression on all cylinders, good spark to all plugs, proper timing of spark to plugs and on a 4 stroke proper cam timing if all is in spec then deal with fuel to air ratios. too little fuel to air(too lean) or too much (too rich)to each cylinder to burn...
  17. 9

    What size socket wrench fits my spark plugs?

    3/4" deep socket should fit, might need to grind down the walls if too thick. saying all of them does not say anything about what sizes you tried
  18. 9

    What size socket wrench fits my spark plugs?

    what size plug sockets did you try?
  19. 9

    2005 Yamaha 150 boat motor and trim unit issue

    take apart the connections and clean them properly, and lube them up. moving the nut a small fraction is not a good long term solution
  20. 9

    Retrofitting a trim sender (2021 Yamaha F25LC)

    just stand up and look when adjusting, then sit back down , life is not that hard
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