Discussion in 'Bicycle Repair' started by Drewsky, Jun 24, 2015.

  1. Drewsky

    Drewsky New Member

    Is 145psi to much compression or is it ok on my i guess there called 66cc motored bike
    Last edited: Jun 24, 2015

  2. jaguar

    jaguar Well-Known Member

    I consider 135psi the limit.
  3. butre

    butre Well-Known Member

    145 is on the high side of what you would do without doing anything special to keep temperature down. with a fred head or similar, higher octane fuel, and a colder spark plug you could feasibly get to 175 without troubles. beyond that in my experience puts too much stress on the chrome plating.

    I know one guy who's running 220 with one of Bert Rod's sleeved jugs and a puch hi hi head. that bike is a real screamer
  4. Drewsky

    Drewsky New Member

    145psi is wait my china girl is putting out. For some reason this motor runs like a raped ape. Better then my jet80.
  5. butre

    butre Well-Known Member

    more compression no doubt means more power, but it can also lead to decreased reliability.