1. Dismiss Notice

PW 50 No compression???

Discussion in 'General Tech' started by mthalt10, Mar 27, 2011.

  1. mthalt10

    mthalt10 PR Member

    Ashley, Oh
    i recently picked up a 94 pw 50 for my son and it has no compression at all. i took the top end off to look at the piston, rings, and cylinder and they all looked perfectly fine. i now cannot figure out why it does not have any compression. do you think it is something to do with the kick-starter internally or what? does anyone know what may be going on?
  2. GeorgiePorgie

    GeorgiePorgie PR Founding Father

    Ohio the 440
    Racing Number:
    Kick starter could be stripped or not tight...maybe missing some teeth...?
  3. baxterj787

    baxterj787 PR Addict

    Xenia, OH
    Dumb question time: does the piston move up and down in the cylinder (with the head off) when the kickstarter is pushed? Note: I ask with the cylinder on because if you try this stunt with the cylinder off, the rod / piston will move at a surprisingly high RPM off of the kickstarter. It is possible to damage the rod or the piston (assumng the piston is OK) as they go flailing about.

    You say the piston, rings and bore "look" fine. What are the clearances? Can your eyeballs tell the difference between a .002" piston-cylinder gap and a .003" gap? How about ring end gap and ring profile? Does the cylinder have a fresh hone to de-glaze the cylinder walls?

    Once you establish those specs as OK (per the manual), then maybe look at the auto clutch system. If the autoclutch is slipping, that might cause the kickstarter to not fully engage.

Share This Page