Compression What Should It Be?

[rippin]

I JUST GOT A NEW COMPRESSION TESTER LAST NIGHT AND WAS GOING TO CHECK MY CR125'S COMPRESSION BUT THE HONDA MANUAL SAYS HONDA DOESNT POST BASLINE A COMPRESSION.MY QUESTION IS WHAT FIGURES SHOULD I BE LOOKING AT HERE ? I HEARD ABOUT 120 PSI BUT WANTED TO NO WHAT U GUYS ARE READING AT?

 

[marcusgunby]

With a Honda piston kit i got about 145psi but with a wiseco it went up to 170psi as the honda piston has a large ring gap.

 

[steve125]

The last few race motors that Eric has set up for me the compression has been in the 190-200psi range. Set up for race fuel and they were big bores to 144. I use a Snap On tester, with the throttle held wide open and kick the engine over quickly until the gauge stops riseing.:eek:

 

[rippin]

ok i just checked both my cr's my dads and mine my dads came out to be 175 and mine was 150 so it seems these are in your ball park although mine seems a little low