Compression

[Drewsky]

Is 145psi to much compression or is it ok on my i guess there called 66cc motored bike

 

[Deleted member 12676]

I consider 135psi the limit.

 

[butre]

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

 

[Drewsky]

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

 

[butre]

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