Jump to content
Sign in to follow this  

'03 YZ450 w/ 13.5:1 piston

Recommended Posts

I ahve an 03 yz450 with a 13.5:1 piston that I just installed in it. The carburetor is completely untouched other than a MSR fuel screw. When I fired the bike up for the first time after the rebuild, it appeared to be running very lean. It would backfire out of the pipe every time I let off the throttle. What would be a good baseline to start my jetting from when switching to a hi-comp piston? The bike also as a full pro-circuit exhaust, and a powernow. My elevation is around 1100 to 1200. Thanks


Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this