MOTOX888

Member
Dec 3, 2005
100
0
how many lbs of compression should an 03 rm125 have on the cylinder? I recently took a compression test and it came out as 155lbs. Do you think that I should replace the top end? What can happen if you let the top end go too long?
 

marcusgunby

LIFETIME SPONSOR
Jan 9, 2000
6,450
2
If you leave the top end too long the piston breaks and can take the entire engine apart, i would invest in a cheap piston kit rather than guess.
 
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