Posts
4
Joined
3/11/2017
Location
Red Bluff, CA
US
I have 03 RM 250 and it feels like it losing power . I recently put a new head on it because my old one had been cracked from previous owner . It also has newer piston and rings I put in when I bought it . I compression checked it today and it has a 120 psi . I can not find anywhere what my compression should be . I never checked when I did the new piston to see what it was then so I trying to figure out maybe it's time for new piston and rings ?
Are you sure you have the correct head?
Paw Paw
The Shop
Every YZ 250 I've owned had been well over 200psi when stock. My Harris Performance YZ 250 which was ported with the head shaved (unmodified dome) tested at 238psi...
Post a reply to: 03 RM 250 compression supposed to be at ?