HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
bill petitt

HELP !! 08 yz 450 f

10 posts in this topic

Got to the track. Bike started 2nd kick, as usual. took off on track. Hit the first jump. Felt like a bog on take off. Almost like something was blocking the exhaust pipe . 1/2 a lap, coasted in. Bike died. I changed plug. Plenty of fire. Tore down carb(3 times:bonk: ) Nothing. Bike wont start at all. I checked timing, by looking at the mark on the cam and it was TDC. ANY CLUE? Any where to start? What about the sensor for the carb? I am new to Yamaha and I am not sure if they have a notorious issue or not Any ideas before I start tearing it dow? Thanks

Share this post


Link to post
Share on other sites

spark would be good to start with?

sounds to me like the valves

you either have a major or radical change in valve spec

tear the top off and check them

Share this post


Link to post
Share on other sites

Checked the fuel breather line and the gas cap(just in case). I would think if it was a valve issue, it would make some sort of noise, don't ya think? That dang honda would make a noise if the valves were out by .001!

I appreciate you guys taking the time to try to help me. If I ever get to the bottom of it, I will let you know.

Thank you again

Bill

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0