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  1. 9

    2001 Yamaha 8hp 4 stroke

    looks like it heads to this part whatever that is. maybe intake manifold
  2. 9

    2018 Yamaha 40 HP, Poor top Speed

    do you have a tach or are you just guessing at RPM? you keep saying speed, so I have no idea if you mean boat speed across the water or RPM. there is no reason I can think of that a motor would make a loud noise like a muffler fell off when it just lowered RPM. motors make more noise at higher...
  3. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    then check what the timing is doing so you know what is going on
  4. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    If the timing does not stay in spec at idle on the proper mark or WOT there is a problem. someone has jacked with the linkage to get it to even run and probably not in a good way. my guess is the CDI is bad
  5. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    only way to know what timing is doing is to hook up a timing light and see what it is doing
  6. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    extra fuel and advancing timing is needed when throttling up. test what you can and then chase fuel
  7. 9

    Decompression valve

    trade it in on a electric start model
  8. 9

    Decompression valve

    I would at least talk to the dealer to see if that motor has a decompression valve. I have no clue if they do or don't
  9. 9

    2018 Yamaha 40 HP, Poor top Speed

    when the loud noise shows up, does the RPM go up or down?
  10. 9

    2018 Yamaha 40 HP, Poor top Speed

    you need to figure out where that loud noise is coming from and does the RPM slow down also or just the speed is reduced?
  11. 9

    2018 Yamaha 40 HP, Poor top Speed

    what does this mean .sounded as if a Muffler fell off exhaust goes out the prop under water so it should be not loud. maybe the motor is too high and the sound comes out above the water
  12. 9

    Please help with HPDI issues

    if everything is in spec but still running too rich, then you may need to try another ECU did you have the injectors tested/cleaned and make sure they are the correct ones
  13. 9

    Please help with HPDI issues

    you still have not said what the rail pressure is at or if the ECU knows when the motor is in gear
  14. 9

    Suzuki DF200AP will not idle

    are you sure? I thought all injected motors controlled the air and the injector on time to get them to run at idle properly
  15. 9

    2001 8hp Yamaha wiring

    Pic might help know what you are saying all I have seen are plug in connectors
  16. 9

    Yamaha 115 stroke flush line clogged

    I would use some Rydlim Marine descaler to see if that helps unblock it before tearing up stuff
  17. 9

    Suzuki DF200AP will not idle

    OK, thought they normally ran higher. saw Yamaha runs 38 to 40 and Mercury 58 to 60
  18. 9

    Suzuki DF200AP will not idle

    Not a Suzuki guy, but I would think the injector rail pressure would be higher than 36 PSI. is there a electric high pressure pump inside the VST?
  19. 9

    2 vent plugs?

    it is my understanding that it is spring loaded to forward. you have to compress the spring to put it into neutral anf reverse
  20. 9

    Please help with HPDI issues

    the stator has the charge coils, pulsar coils and lighting coils. your service manual should give you the minimum peak voltage readings for each going to the CDI. I am thinking this is a CDI controlled motor
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