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  1. 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
  2. 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
  3. 9

    Waterpump housing purchase ,missing parts???

    good to hear it is going well now
  4. 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?
  5. 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
  6. 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...
  7. 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
  8. 9

    Waterpump housing purchase ,missing parts???

    pic of what you are talking about might help
  9. 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
  10. 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
  11. 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...
  12. 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
  13. 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
  14. 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...
  15. 9

    Did I knock lower unit out of neutral during water pump service?????

    yes the prop shaft should move freely when in neutral
  16. 9

    Did I knock lower unit out of neutral during water pump service?????

    just drop it again and set the lower into neutral along with the controls and then reinstall
  17. 9

    2001 Yamaha 50hp tlrz 2 stroke with prime start system starts and dies

    should have used the old one when he put the new carb on, old is better than none
  18. 9

    2001 Yamaha 50hp tlrz 2 stroke with prime start system starts and dies

    who replaced that center carb? you or someone else? hope it is that simple of a problem
  19. 9

    Aren't my ignition coils defective?

    My thoughts ,if you were getting water into a cylinder you would see signs of it on the spark plugs.
  20. 9

    40 hp 2 stroke open/close switch?

    run it in the normal mode. open is to help get the motor runing if you cannot get it to start when in normal due to plugged up automatic system once started in open you should turn it to closed or it will run too rich
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