I was trying to remove the flywheel nut while providing resistance to the pto coupler, now if I spin the flywheel and provide resistance to the coupler the coupler remains in place while the flywheel (and pistons) rotate. When I spin the flywheel without resistance to the coupler they all spin normally.... Is it possible I damaged something? Yamaha 650 engine on a Boston Whaler Rage.

  • Does the PTO remain engaged all the time normally? Commented Aug 19, 2018 at 19:00
  • Yep. When I started, I had enough resistance from the coupler that when it went loose, I had though it was the bolt freeing... the bolt is still in there good.
    – Calvin
    Commented Aug 19, 2018 at 19:02
  • Anyway to stop it via the starter ring directly? Commented Aug 19, 2018 at 19:29

1 Answer 1


More than likely you've just backed the PTO sprocket off of the drive shaft of the PTO itself. I'd suspect if you dismount the PTO (if you can easily) from the engine, you'll be able to see what you'd need to do to fix it. Bottom line, if things gave way easily, there shouldn't be any damage, but you may have to put things back together again. Like I said, you'll have to take the PTO itself away from the engine before you'd be able to tell.

  • 1
    Yep, silly me. I reversed direct and spun the PTO until it was torqued down again.
    – Calvin
    Commented Aug 20, 2018 at 11:37
  • @Calvin - That's awesome. Easy fix :o) Commented Aug 20, 2018 at 17:21

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