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  1. 9

    Yamaha 15 mounted too high

    4 strokes are usually rated at a higher RPM than the 2 strokes is why I asked what the motor is 6K may be fine if it is a 4 stroke,
  2. 9

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    Yamaha mechanical fuel pumps use the pulse from one of the cylinder crankcases to operate the fuel pump. most are mounted on the side of crankcase, but this one is mounted on the bottom carb so I assume it is still ported to either the crankcase or the the reed chamber to get the pulses. if the...
  3. 9

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    I am not sure what you are trying to say. are you saying that one fuel pump will flood all carbs? the other poster was talking about if the pump diaphragm leaks, it will flood #3 crankcase and not affect all 3. which is correct.
  4. 9

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    no worse than metal tanks back in the day
  5. 9

    Yamaha 15 mounted too high

    is this a 4 stroke or a 2 stroke 15? seems not many post up the true motor's model # anymore so it is hard to tell
  6. 9

    Carburetor question on restoration I’m working on 1992 40 hp MSHQ Yamaha

    Tank pressure should not flood a motor. I had an old metal tank before on a 35 hp Evinrude that the primer bulb blow up on when I stopped at my parents house and let it sit in the sun for a few hours, but it never flooded the motor
  7. 9

    Yamaha F60TLRH 2009 Model - Doesn’t Start on 1st Turn of Ignition

    I had thoughts in the past that the lift pump comes on when key is turned to the on position on these motors, but I was told different. Just the pump inside the Vst comes on pressurizing the rail. the lift pump only runs when the motor is running. I have no idea what motors that is true on, but...
  8. 9

    2009 Yamaha 15hp 2 stroke pull cord problem

    what does a bunch of blobby deposits mean? Have you pulled the spark plugs to look at them and what comes out of the plug hole if you spin the motor without the plugs in? You need to find out if water is getting into the combustion chamber , before worrying about what to do if it is. Could the...
  9. 9

    Yamaha F60TLRH 2009 Model - Doesn’t Start on 1st Turn of Ignition

    from what I have read about injected 4 stroke motors, the IAC resets to 100% when you turn off the motor so it will be ready for the next start up. when started it will be at high idle until the ECU tells the IAC to slow RPMs to normal idle speed maybe your IAC was sticking and not closing...
  10. 9

    Yamaha F60TLRH 2009 Model - Doesn’t Start on 1st Turn of Ignition

    how long have you owned this motor? has it ever started faster than 3 key on cycles? where are you located in the world? I do not see a 2009 F60TLRH listed here in the USA
  11. 9

    Using hose flush to cool engine.

    I have read as long as there is very good water pressure there will be some water getting to the pump lubricating it. if you are really worried about it inspect the pump yourself
  12. 9

    2009 Yamaha 15hp 2 stroke pull cord problem

    that sounds a lot like water getting into a cylinder to me
  13. 9

    2009 Yamaha 15hp 2 stroke pull cord problem

    something is stopping the motor from turning. if water gets into a cylinder it will act like that. pull the plugs and inspect the next time it does that. or see if you can turn the motor/flywheel by hand the next time it stops moving with the rope
  14. 9

    Yamaha 15 mounted too high

    I agree, a new motor and it is not running properly needs to be taken back to the dealer
  15. 9

    1989 DT4 out of control idle speed

    I do not see how a plugged jet could make RPM scream. hope it is fixed
  16. 9

    2005 Yamaha 70B running rich

    check that the prime start heater unit extends the needle when 12 v is put on it for s few minuets which should close off the extra fuel needed only during cold start and make sure the fuel pump diaphragm and prime start diaphragm are not leaking fuel into the crank case causing too rich of a...
  17. 9

    RPMs out of control

    what do you mean it seems way faster now? boat moves faster across the water? or just motor RPMs seem higher when it revs up sometimes while under a load? these Yamaha's are normally spring loaded into forward, and have to compress the spring to go to neutral and reverse. you need to find out...
  18. 9

    2009 Yamaha 15hp 2 stroke pull cord problem

    if you are positive the start in gear preventer is not the problem I would pull the spark plugs if removing the plugs helps the motor to spin free, inspect for water intrusion. another thing to look into is the lower unit locking up. drop the lower unit to see if that will allow the motor to turn
  19. 9

    2018 Yamaha 25 hp. 4 stroke will not run at slightly above idle.

    sometimes a heated sonic cleaner is needed to get everything cleaned properly. sounds to me like the off idle ports have a problem
  20. 9

    2018 Yamaha 25 hp. 4 stroke will not run at slightly above idle.

    exactly how did they get cleaned 5 times? not everyone thinks cleaning the same way
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