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  1. 9

    I have a 30hp Yamaha 2 stroke 3cylinder 1991 2nd spark not firing any ideas?

    only a bad spark plug can do that. back in my younger days working at an automotive dealership ,I ran across a few new plugs that were bad
  2. 9

    I have a 30hp Yamaha 2 stroke 3cylinder 1991 2nd spark not firing any ideas?

    it is not easy that is why you test everything else to make sure those are good before chasing fuel
  3. 9

    I have a 30hp Yamaha 2 stroke 3cylinder 1991 2nd spark not firing any ideas?

    copression test, and then use a timing light to see if each cylinder is sparking at the correct time. if no good spark on one or more cylinders, measure the peak voltages into and out of the CDI I see it has a charge coil and Lighting coils, but the pulser coils signals to tell when to spark...
  4. 9

    2006 Yamaha 250 VMAX SHO

    the gauges should indicate what the alarm is from. a light or some other indicator, depending on what gauges you have
  5. 9

    2006 Yamaha 250 VMAX SHO

    guessing at what is causing the alarm is no good, and running the motor with the alarm sounding for 45 minutes is a bad Idea. what do your gauges tell you is happening when the alarm sounds?
  6. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    is there a switch that operates the solenoid or maybe pushing in on the key switch would operate the solenoid? are there butterfly plates in the front of each carb that the linkage is tied to? if so what operates those. they should not be closed when running
  7. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    all the motors I have messed with did not have chokes if they were prime start or Fuel injected, so I am very confused
  8. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    can you run the boat with the cowling and silencer off so you can see what all is moving and opening/or not opening as you open the throttle when the problem shows up. something is affecting all 4 carbs /cylinders
  9. 9

    Waterpump housing purchase ,missing parts???

    good to hear it is going well now
  10. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    so what does the solenoid do? is it connected to all 4 carbs? what does that linkage attach to and move? almost looks like a choke plates in the front of carbs. and the linkage in the parts breakdown call the linkage choke linkage. is it possible those are not opening back up like they should?
  11. 9

    Yamaha 130 hp idle adjust

    setting to spec is the correct way, and check to see what the timing is doing with a timing light. timing can change the idle speed also
  12. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    pull the stat and test in a pot of water as you heat it up, make sure it opens according to spec. The only other thing that I can think of that could affect fuel to all Cylinders would be the prime start enrichment system. make sure it is allowing the extra fuel when motor is cold and then...
  13. 9

    Waterpump housing purchase ,missing parts???

    there is no pic, but I now see a link to another web site with a pic of housing and the dampener yes you need to put those in or water leaks out around the tube where it comes out of the pump housing heading up to the power head
  14. 9

    Waterpump housing purchase ,missing parts???

    pic of what you are talking about might help
  15. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    your right, forgot it was a 4 stroke. but what would affect all 4 cylinders if that is what is happening each one have its own carb
  16. 9

    4 stroke 50hp 1997 Yamaha outboard black smoke rough runnning

    do all cylinders/spark plugs show signs of over rich? ( black carbon build up) if just some which cylinders? how many fuel pumps does this thing have and what cylinder crankcase does it get its pulse from
  17. 9

    yamaha f150 running problem

    if the fuel system leakes before the lift pump on motor, it can suck air in. pumping the primer bulb would fill the VST so the pump inside of it could pump the rail up. running the VST pump without fuel in the VST to pump, cannot cool and lube that pump and harm it. but if the problem shows...
  18. 9

    yamaha f150 running problem

    1st thing you need to do is find out if the rail pressure is in spec when the problem shows up
  19. 9

    yamaha f150 running problem

    My only thought is the motor runs fine with no load on the motor, but with a load there is not enough fuel to handle the load make sure the fuel rail pressure is in spec
  20. 9

    Yamaha 130 2 stroke oil injection question

    I would think your service manual would have a testing procedure on the volume of the oil being produced to those outlets. But you could premix some fuel to run on and monitor the level on the motor tank that is lowers to see that the proper ratio get used for the gallons of fuel used. double...
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