CB72 compression - what are GOOD readings?

bbraun · Post by **bbraun** » Tue Sep 18, 2012 4:04 pm

What would be considered good compression on a CB72? I could tell mine is tired but I've been putting off a motor rebuild. L. is 100 and R. is 120 using the kind of weak battery/starter in it.

Thanks

brewsky · Post by **brewsky** » Wed Sep 19, 2012 4:25 am

That is plenty especially if the readings are cold.

I believe the spec is 120 psi for a c72.

Check when warmed up, throttle held open, choke off, good battery or several kicks.

Readings could be a little closer.

bbraun · Post by **bbraun** » Wed Sep 19, 2012 6:27 pm

brewsky wrote:That is plenty especially if the readings are cold.

I believe the spec is 120 psi for a c72.

Check when warmed up, throttle held open, choke off, good battery or several kicks.

Readings could be a little closer.

A C72 is a 250 Dream. A CB72 (Hawk) compression certainly should be more.
Thanks for checking though -

brewsky · Post by **brewsky** » Wed Sep 19, 2012 8:02 pm

Sorry...I misread the model.
Still wouldn't be worried about those numbers unless they are warmed up and consistently that much different.