Jump to content
Sign in to follow this  

03 yz40f running lean?

Recommended Posts

My new to me bike is running poorly. Wont kickstart(have to jump it), has a huge hesitation, and pops off throttle. All leading me to believe it is running lean. Now how can I fix this? I tried the adjustment screw on the bottom of the carb, and whether in or out and everything in between it still ran horrible.

Mods:

Full DR. D exhaust

Swiss cheesed airbox

Boyesen acc. pump bowl

I cleaned the carb, reset timing, checked valves, and did an oil change/spark plug swap and it got me nowhere.

Share this post


Link to post
Share on other sites
Sure the valve clearences are good?

Fuel is fresh?

What happened, no matter how insignificant, sionce it ran properly?

Valves seemed ok, a little tight on the intake side. If that is a possible culprit I drop the bike off at a shop to have them do it as I tried to figure it out and had a bit of a tough time when thumbing through the manual

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  

×