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  1. 9

    1989 70hp Yamaha cooling system flush

    Pull the thermostat and leave the housing off so you can see what all come out when you (while you have the lower off ),hook a hose to the pipe heading up to the powerhead turn on the water and hope you get most of the pieces out of the cooling passages. On a motor that old you may end up...
  2. 9

    Yamaha LCD meter wiring diagram

    that is correct but the meter will indicate what the problem is so you don't have to guess
  3. 9

    Yamaha F225 ECU Upgrade

    from what bosco wrote in post #14, it seems the harness will no to be a 51. but you can wait for him to say so
  4. 9

    Yamaha 50hp rebuild ?

    I sent in my C40 crank to have it rebuilt some years ago. they just sent me one that they put all new bearing into and seals, for around $400 me and a friend put it together in my den inside my house ty raps work once you get the 1st piston into the block the ty raps slide off the piston and...
  5. 9

    Yamaha 50hp rebuild ?

    I have used ty-raps before to get the rings orientated correctly and a little compressed and just cut the ty raps as the pistons go in
  6. 9

    Help with #1 cylinder location- 2007 df250

    I would venture to say all the outboards I have seen the very highest cylinder is #1 even on vehicles the farthest forward was #1
  7. 9

    Please help with HPDI issues

    I have never seen an air filter on any outboard motor. could that have something to do with no one mentioning one in the thread, except for Mr. Obvious?
  8. 9

    2001 Yamaha 8hp 4 stroke

    man o man if that help offends you, you must have a tough time going thru everyday life
  9. 9

    2001 Yamaha 8hp 4 stroke

    there are cooling passages everywhere did you notice it hits a tee and heads to other places also
  10. 9

    2001 Yamaha 8hp 4 stroke

    looks like it heads to this part whatever that is. maybe intake manifold
  11. 9

    2018 Yamaha 40 HP, Poor top Speed

    do you have a tach or are you just guessing at RPM? you keep saying speed, so I have no idea if you mean boat speed across the water or RPM. there is no reason I can think of that a motor would make a loud noise like a muffler fell off when it just lowered RPM. motors make more noise at higher...
  12. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    then check what the timing is doing so you know what is going on
  13. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    If the timing does not stay in spec at idle on the proper mark or WOT there is a problem. someone has jacked with the linkage to get it to even run and probably not in a good way. my guess is the CDI is bad
  14. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    only way to know what timing is doing is to hook up a timing light and see what it is doing
  15. 9

    Yamaha 40 hp 3 cylinder wont accelerate

    extra fuel and advancing timing is needed when throttling up. test what you can and then chase fuel
  16. 9

    Decompression valve

    trade it in on a electric start model
  17. 9

    Decompression valve

    I would at least talk to the dealer to see if that motor has a decompression valve. I have no clue if they do or don't
  18. 9

    2018 Yamaha 40 HP, Poor top Speed

    when the loud noise shows up, does the RPM go up or down?
  19. 9

    2018 Yamaha 40 HP, Poor top Speed

    you need to figure out where that loud noise is coming from and does the RPM slow down also or just the speed is reduced?
  20. 9

    2018 Yamaha 40 HP, Poor top Speed

    what does this mean .sounded as if a Muffler fell off exhaust goes out the prop under water so it should be not loud. maybe the motor is too high and the sound comes out above the water
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