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  1. J

    Compression test to diagnose rod knock or rattle?

    Hi all, I have a 2000 Yammy F15ESHY that I have finally gotten back up and running. It's been performing well with no hesitation, sputters, etc. However, in WOT, I've noticed a "pinging" noise that actually causes the engine to move, like if you were standing next to it and gave it a little...
  2. J

    Valve Clearance

    Hi again everyone, I'm in the process of adjusting my intake and exhaust valves on my Yamaha F15ESHY. The manual states that the intake valve should be set to .20 mm and the exhaust to .25 mm. I'm having a hard time understanding the diagram. At what point do I measure this? Thanks!
  3. J

    Intake valves slightly open on 4 stroke Yamaha 15...normal??

    Hi guys, Just wanted to start by saying thanks to everyone for all of the great advice that I've gotten so far. I've been through hell and high water with my 2000 Yammy F15ESHY lately and I think I've almost got it fixed. However, when I went to rebolt my cylinder head back on after replacing...
  4. J

    Both pistons simulataneously at TDC on Yamaha 2000 15 hp 4-stroke???

    Hi all, I have a 2000 Yamaha F15 4-stroke that I have been knuckle deep in for quite sometime. The problems first began when my head gasket blew. So I replaced it and when I went to go fire it back up...nothing. It would turn over, but it wouldn't actually fire, not even a pop. I had fuel and...
  5. J

    Yamaha F15 won't start after replacing head gasket

    Hi all, Ok, so i replaced the head gasket on my 2000 Yamaha F15 (F15ESHY) after noticing "milky" engine oil and power loss. I put it back together and got nothing. Engine turns over, has good compression and good spark. I just cleaned the carb and replaced all my fuel lines, filters, and fuel...
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