compression?

[Lake]

Whats normal compression on a 2001 cr 125, and how low should it be before i put a new piston in?

[tughill283]

i had a 2001 yz125 at 1,500 ft elevation it had 180 psi. i did a rebuild as soon as it dropped to 150,just that much of a difference was a huge power loss. at 8,000 ft elevation in wyoming it had about 150 psi when it was on a fresh top end.elevation changes 3% less per 1,000 ft your cr should be similar to the yz

[trx]

i would not got under 140 on a 125 becouse the faster rotationing mass becouse smaller flywheel so it wears out faster

[flotek]

should register somehwere around 170 pounds

[Lake]

alright, thanks. (Y)