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  1. 9

    Yamaha F300 Cylinder Head Pressure Testing

    never even heard of this before. why would you need these plates?
  2. 9

    2003 yamaha 50 4-stroke runs rough

    YAMAHA OEM PRIME STARTER | 62Y-14380-10-00 there is one on #1 and #3 carb they add fuel to the cold motor and should shut off the extra fuel as the motor warms up. at least that is how the unit on my C40 works
  3. 9

    2003 yamaha 50 4-stroke runs rough

    how many of the plugs are black, and if not all of them which ones are black? sounds like too rich to burn properly, not sure it that could be from spark timing not firing plugs far enough advanced or not. never seen that before. make sure the prime start systems are functioning properly. is...
  4. 9

    Question before I start tearing apart carburetors.

    you can guess at things for as long as you want. taking reading proves if something is in spec or not. do you even know what controls the timing on that motor? or do you have a service manual? On my 1999 C40TLRX the CDI does it electronically. It had a problem with timing, and I had to buy a...
  5. 9

    Question before I start tearing apart carburetors.

    spark timing can be seen with a timing light. if the timing does not advance when the throttle is advanced the motor will not burn the fuel properly, so there is not the proper power. your service manual will have the specs, and it will also tell you how to check the cam timing
  6. 9

    Question before I start tearing apart carburetors.

    my troubleshooting starts with good compression on all cylinders, good spark to all plugs, proper timing of spark to plugs and on a 4 stroke proper cam timing if all is in spec then deal with fuel to air ratios. too little fuel to air(too lean) or too much (too rich)to each cylinder to burn...
  7. 9

    What size socket wrench fits my spark plugs?

    3/4" deep socket should fit, might need to grind down the walls if too thick. saying all of them does not say anything about what sizes you tried
  8. 9

    What size socket wrench fits my spark plugs?

    what size plug sockets did you try?
  9. 9

    2005 Yamaha 150 boat motor and trim unit issue

    take apart the connections and clean them properly, and lube them up. moving the nut a small fraction is not a good long term solution
  10. 9

    Retrofitting a trim sender (2021 Yamaha F25LC)

    just stand up and look when adjusting, then sit back down , life is not that hard
  11. 9

    Retrofitting a trim sender (2021 Yamaha F25LC)

    if trimmed to high at speed the bow will bounce up and down or the motor will rev up as the prop loses bite. can you see your tell tail from where you sit? that tells you if the water pump is pumping water,
  12. 9

    Retrofitting a trim sender (2021 Yamaha F25LC)

    I got to ask, why do you need it? I just rim until the boat is running well. too far and you bump it back down a little
  13. 9

    Yamaha 20 fourstroke no power

    there are check valves in the fuel pump, but they just keep gas from flowing back out of the motor not to the motor. so yes fuel will flow out of the tank thru the pump if pressure builds up in the tank
  14. 9

    Why o' why?

    there should be a trap and drain line on the bottom of the oil tank that water would collect in ,if you want to drain just some oil out to see if any water was in the bottom
  15. 9

    Why o' why?

    drain the oil tank to make sure there is no water in there, but I do not see how over filled with oil would cause running issues
  16. 9

    2005 Yamaha 150 boat motor and trim unit issue

    there should be a manual release screw on the T&T unit, hole thru the bracket to get to the screw would be my guess if that big motor is like my 40hp. but I do not know how you can do any manual lifting with boat sitting in the water
  17. 9

    2005 Yamaha 150 boat motor and trim unit issue

    test light lighting up does not mean there is a good enough connection to run a T&T motor or turn the starter. use a voltmeter to measure on the battery posts them self, and then on the cables(both ends of pos and neg) while you hit the T&T switch key switch does not affect T&T operation
  18. 9

    Trim/tilt system stopped working; can here clicking from the relays.

    to the wires you disconnect from the relay
  19. 9

    200 hp Saltwaterseries lift motor engaging on its own.

    how many T&T switches do you have? friend has had his dog lay down on the bow and operate the T&T several times while I have been in his boat . you can always disconnect on switch at a time to see if the problem goes away
  20. 9

    Yamaha f40bet overheating

    you might try using a chemical descaler like Rydlime marine descaler. or take the motor apart farther to find what is plugged up
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