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  1. 9

    Please help with HPDI issues

    get the proper test equipment to measure the out puts of the different coils
  2. 9

    Evinrude or Suzuki

    I think the 4 stroke motors should be able to turn 6500 WOT. your prop is probably too much for this motor and boat setup
  3. 9

    2018 Yamaha 40 HP, Poor top Speed

    mark the prop and hub/shaft. run the boat to make the problem happen again and then check to see if the marks are still lined up
  4. 9

    2018 Yamaha 40 HP, Poor top Speed

    need to talk about RPM also, not just speed
  5. 9

    2 vent plugs?

    if you read his #2 post, the top hole is labeled fill level. I see OP posted while I was posting, and he covered what was said
  6. 9

    2 vent plugs?

    I would like to know what the middle one is there for.
  7. 9

    2 vent plugs?

    A pic of what you are talking about would help. sounds like you have a drain, vent, and fill level, and I never heard of this. giving the motors complete model info might help look up what you are seeing
  8. 9

    1986 Suzuki DT75

    good to hear. I am sure there is a pilot mixture adjustment screw on each carb somewhere just like on my Yamaha you can fine tune the idle some. all 3 throttle plates need to be closed completely to lock the linkage together So all are opened exactly the same amount, and then adjust them to...
  9. 9

    Please help with HPDI issues

    the O2 should tell the ecu if it is running rich
  10. 9

    1986 Suzuki DT75

    I am not a Suzuki guy, but you need to find a service manual for your motor. You should have a service manual for all motors you own if you plan on working on them
  11. 9

    Please help with HPDI issues

    what tells the ECU the motor is getting proper fuel on these motors? does it have an O2 senser? maybe nothing. it depends on the High pressure pump regulator to have the correct pressure. did you make sure the ECU knows when it is in gear yet?
  12. 9

    Please help with HPDI issues

    those motors limit RPM in neutral by cutting off more cylinders that just the 2 it drops in neutral make sure the motor knows when you put it into gear. it may not be getting the signal it is in gear
  13. 9

    Please help with HPDI issues

    if that is true, then I would be looking at fuel pressure being too high or what is telling the ECU that it is running lean making it turn the injector on too long
  14. 9

    Yamaha S200TXRU

    The U says it is a 96. not sure what you mean by plug and play with a injected motor
  15. 9

    25 HP Yamaha 4 stroke backfire

    so moving the throttle does not move the plunger? it was just a guess since I have not worked on that motor myself. sometimes running the disassembled carb thru a heated sonic cleaner can get stuff out you cannot other ways
  16. 9

    25 HP Yamaha 4 stroke backfire

    I guess you removed the plug so you could remove, clean, and adjust the pilot screw. that plunger mechanism has me thinking that maybe it is not injecting enough extra fuel while accelerating
  17. 9

    25 HP Yamaha 4 stroke backfire

    is this a carbed motor or injected? giving all motor model ID info helps heck we have no idea what year even
  18. 9

    2009 yamaha 225hp no power

    as always, start with compression, then test spark and the timing of that spark if all of that is good then you are left with a fuel issue posting all the motors model info would help others know what motor you are dealing with. I would think this is an injected motor, so testing fuel rail...
  19. 9

    F115 - no signal to #2 injector

    sounds to me like Boscoe says the injectors should have power all of the time but the ECU fires them by furnishing the ground
  20. 9

    Yamaha F20 no spark.

    yes they are some of the coils under the flywheel. so are the pulsar coils there are also lighting coils under there that create the power to charge the battery
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