compression test.

[mart]

I have just rebuilt my CB750F DOHC engine,, reseated the Valves and clearance,, honed the barrels New rings Genuine Honda ,, I have not fitted the Carburettors yet But i have done a ( COLD ) compression test, and i am getting 130 PSI on all cylinders ,, Does anyone think these numbers will increase much when bedded in and another test done on a HOT Engine,,Martin.

 

[ClitCommander]

These numbers will most likely go up 10-20 psi after 500km's

 

[dirtdigger]

They will go up some but 130 isn't terrible but not good either.

 

[FordDOHC79]

Did you replace the primary chain tensioner? If yes, where did you it from?

 

[amc49]

Normal is 170 psi and 130 is not that great at all. If the work done right the rings may go up 10-15 psi but new rings really seat pretty much in five-ten minutes of running (they better). They seat a little more over time but you need like 150-155 at the very start to be right. I'd look at the valve work first; easily can be trouble there.

Suspect your compression gauge as well, you have no idea how much trouble those things can give. Many are utter crap for quality.