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
426yota

Yz426f help!!!!

4 posts in this topic

2000 YZ426F HELP!!!! < SnakesRus > 04/11 17:43:15

My bike is impossible to start.....

I just put a new plug in it and adjusted my carb back to stock specs besides the idle screw, cause i need the bike running to get that right.

Ive heard it might need a valve job.

Ive also heard that it might need to be rejetted due to my FMF Powercore 4 exhaust.

It has great compression, its impossible to kick over at the top of the stroke and I know it gets spark because Ive got it started once and rode it around for a while. When I did ride it I noticed it popped when decelerating, it ran hot enough to start overheating (coolant was coming out of the over flow) and to start melting my side panel at idle (however it didnt have a heat shield like it is supposed to).

Any ideas..

Share this post


Link to post
Share on other sites

ok so i think i figured out the problem

To me, it looks like my cam sprockets are misaligned or they spun a little

DSC00422.jpg?t=1271139937

The right cam gear looks to tilted just a little bit at TDC and the left one looks to be way off.

How can i tell if they spun versus someone just mis-aligning them on the last valve job?

Share this post


Link to post
Share on other sites

Need a pic of your TDC mark on the crank - people tend to get that part wrong.

Apart from that - it looks pretty good - definitely NOT enough out to make it not start.

Your cam chain might be a bit stretched too - this can cause the dots not to line up perfectly.

Both OUTER dots only need to be level with the top of the head at exact TDC.

Turn it a mm or two forward to get the intake dot up a bit and exhaust dot down a bit (they should both come to level with the head surface) and then see what TDC looks like...

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