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  1. 9

    1990 Yamaha 250 VX 76. Power drops off.

    but have you monitored the fuel pressure while this is happening at the fittings to the carbs? sounds to me like there is not enough fuel in the carb bowls so it cannot spool up or the main jets are plugging up
  2. 9

    1990 Yamaha 250 VX 76. Power drops off.

    a complete model # would help find what motor you have . I do not see a 1990 VX250 listed the 1990 250STXD I see has carbs, Fuel pressure would be a good thing to check if you think the carbs are running out of fuel.
  3. 9

    (1987) 70 HP yamaha 2 stroke won't stay running, slowly goes to idle

    not many 33 year old motors that are still good
  4. 9

    Low RPM on 2002 F9.9ELRA

    well apparently I was wrong on the WOT RPM all you can do is get a smaller prop to up the RPM. too much load on a small motor. a 50 hp would be a lot better on that boat
  5. 9

    2000 Yamaha 115 4 stroke won’t go to full throttle

    testing is better that just throwing parts at the motor to see if that helps.
  6. 9

    Low RPM on 2002 F9.9ELRA

    I thought 4 strokes were suppose to run 6K not 4-5k. has this set up ever ran higher RPM? 16 ft boat running only a 9.9 hp is under powered. what is the boat HP rating
  7. 9

    2000 Yamaha 115 4 stroke won’t go to full throttle

    what is the rail pressure doing when it falls on it's face? have you used a timing light to see what spark timing is doing when the problem shows up? what is a smoke test of the fuel system?
  8. 9

    Yamaha 150 4 stroke - change of rotation

    props are a lot easier to find than lower units, and I see no reason for the motor to be louder or choppier, what ever that is
  9. 9

    spark plugs

    back in the good old days I think they put resister plugs on cars motors to help reduce the radio noise I am not sure why they went to R plugs on boat motors
  10. 9

    1985 Yamaha 9.9SK

    points worked so well that even when you set them with a feeler gauge you still had to check and readjust with a dwell meter to get the set properly. also had to replace them every year and maybe even more often if the cap went bad and caused the points to arc too much and pit. not to mention...
  11. 9

    alarm when turn the key on

    it is always best to drain the main tank before removing the level sensor to keep any bad stuff from going into the pump. and always replace the gasket/strainer with new when putting back in, getting trash into the oil pump is bad
  12. 9

    Lack Of Power Under Load

    110 is good enough. testing the peak voltages into and out of the CDI will be the best thing to do to tell if one of the components is a problem. timing light will show if all 3 cylinders are getting spark and if the timing is in spec and advancing properly draining an in board tank may not get...
  13. 9

    2017 Yam ran fine then near stall, now runs and idles rough. WHY?

    when problems show up it is good to check compression or leak down on all cylinder, spark to all plugs, timing of the spark, and fuel pressures. doing what testing while the problem is there should lead you in the direction to fix the problem. hard to believe the shop did no testing as all
  14. 9

    What is this tube for on a Yamaha 60LB

    is there a hole in the end piece or is it a solid plug? if a hole, need to plug or water will come out underway carries water pressure from lower unit front edge to indicate speed
  15. 9

    Fuel mixture WOT 1986 Yamaha 30 hp 2 stroke

    back when I was fighting an over rich condition at high rpms on my C40, I never found any info on measuring the size of the jet holes. so I bought a new one and measured it and my old ones with different drill bits to find out someone drilled out the main jets
  16. 9

    Yamaha 115 4 stroke, starting problem

    if it is already in neutral to start, why are you trying to put it in neutral
  17. 9

    2007 DF 300 HP Suzuki has 1 beep every 5 seconds

    I did not ask if tach lights showed anything. I asked what was beeping, because you said the motor is beeping. I do not remember seeing any motor that has a device on it that would beep. ignition switch or a tach could have a device that makes noise. Suzuki some times have beeping to notify the...
  18. 9

    2007 DF 300 HP Suzuki has 1 beep every 5 seconds

    is the engine beeping or the tach itself? Could it be a maintenance time warning
  19. 9

    Worth fixing 1998 Yamaha 25HP 4-stroke?

    compression or a leak down test will tell if the cylinders seal properly. pulling the stat and head to inspect will give you an idea of how bad the cooling passages are
  20. 9

    1996 Suzuki DT65. SEIZED!

    some have no idea the crank and rods come as a set. and there are very specialized tools needed to take apart and put back together. getting the pistons out of a motor that will not turn/rotate is not an easy task
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