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  1. 9

    Lower unit leak

    did you smell it to see if it was lower unit lube or oil from the power head?
  2. 9

    Yamaha 90 2 Stroke No Spark

    might try looking here https://www.cdielectronics.com/support/ if not the switches then maybe the wiring has a intermittent grounding of the wire that kills the spark I have never tried taking AC voltage readings ,so I have no idea how that would compare to specs
  3. 9

    Yamaha 90 2 Stroke No Spark

    need a peak voltage reading meter made to test these CDI systems or a DVA adapter and regular meter set on DCv look up CDI electronics trouble shooting guide on line to see if reading that helps you understand some of the stuff in your manual the key switch turned to off and/or the man...
  4. 9

    2008 90TRL need more power!

    yeah, I would like to be able to find all those old 2 stroke performance Bulletins myself. I have no idea what they did with all of those we use to be able to look at.
  5. 9

    2008 90TRL need more power!

    did it hit the speeds listed on the performance Bulletin? I just looked and that one you posted showed a F90TLR. And it would run 41.2 MPH at 5900 RPM. is that what the 13 pitch does?
  6. 9

    2008 90TRL need more power!

    very strange that you had to drop down to a 13 pitch if the performance bulletin showed an 18. you need to find out if the motor has a problem or if boat does. See if any of the shops around you have a test prop for that motor. they should be able to test it in a tank to see if the motor will...
  7. 9

    Yamaha 2-stroke 50HP 1980's bogs and not reaching max RPM

    it is the hole on the backside of the pump into #3 crankcase that furnishes the pulse to the pump diaphragm
  8. 9

    Yamaha 2-stroke 50HP 1980's bogs and not reaching max RPM

    usually just remove the pump from the block and pump the bulb to see if any fuel come out the pulse port not along the edges. with the bolts removed you might see leaks between the parts
  9. 9

    In-water testing for overheat. How hot is too hot on your hand?

    so you are saying the water pump is 20years old? replace it before it falls apart and sends pieces into the block that causes problems and you will need to go find. replace the parts broken, missing, or just need replacing due to age. use an infrared gun to get temps, everyone has different...
  10. 9

    OX 66 - oil vent hose hanging , Where does it go

    complete motor ID helps other know what you are talking about. but I guess you have no idea what you have so it is what it is. I am sure Yamaha did not cap off the drain, but I could be wrong I guess
  11. 9

    OX 66 - oil vent hose hanging , Where does it go

    I thought that the drain hose from the bottom of the oil tank hooked up to the top of the tank when you were not draining the contaminants out of the bottom of the oil tank on the motor. but that may not be true on what ever OX 66 motor you are talking about
  12. 9

    How much water is too much in water seperator

    any free water in the filter is too much, means you have a lot more in the tank. drain completely and clean the tank of all water and other debris.
  13. 9

    Yamaha F150 overhauls?

    the only mention of outboard on that site was the lower units
  14. 9

    Yamaha 2-stroke 50HP 1980's bogs and not reaching max RPM

    how about not enough fuel to the air going in
  15. 9

    Yamaha 2-stroke 50HP 1980's bogs and not reaching max RPM

    have you tried cleaning the carbs? does it help to use the choke when the problem shows up? have you checked compression on all cylinders? restricted main jet or maybe something floating around in the carbs plugging things up. even water down in the bottom of bowls could cause problems from...
  16. 9

    70HP YAMAHA 1990 only runs on 1/3 cylinders!

    not enough fuel due to plugged/restricted passages or a vacuum leak. something is not letting getting the proper fuel to air ratio into the 1 & 3 cylinders. heated sonic cleaning machine helps when the carbs are taken completely apart and soaked/ cleaned properly.
  17. 9

    Yahana 200hp txrr stumbles at idle

    in post #14 I asked if you linked all carbs with throttle plates completely closed. was that not part of the link and sync procedure?
  18. 9

    Low compression on top cylinder.

    I have done small heads myself at home before, but something the size you are dealing with may be best to take it to a shop to have it resurfaced.
  19. 9

    Low compression on top cylinder.

    no, the whole head needs to resurfaced until flat
  20. 9

    Yamaha 50 tlr prime start test

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