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
sp43

YZ timed ?

7 posts in this topic

Is there an easy way to see if my 2001 wr426f has been timed to YZ specs? The bike had a lot of mods done to it by the previous owner and I am not sure what all has been done. I listed the ones that I know have been completed. Also can someone tell me the size of the stock gas tank?

Share this post


Link to post
Share on other sites

SP,

Take the cam cover off, rotate to TDC and the punch marks on both cams should be at 9-12 & 3 oclock. The YZ timing will have 12 chain pins between the 12 oclock marks, WR timing will have 13. Try this web site, all free mods are explained very well. Site is for the WR250 but its all the same.

www.garlic.com/~rdkienle/wr250f_free_mods_2.htm

Share this post


Link to post
Share on other sites

thanks for the help! It sounds pretty involved. Do I need to take the top of the engine off to look at the timing?

Share this post


Link to post
Share on other sites

remove the tank and seat and y'll see the cam cover remove that and the two screw plugs in your left side engine cover to rotate the motor, refer to your manual for the position for TDC then count the pins as mentioned further up the page.

Share this post


Link to post
Share on other sites

SP, You take the cam cover off. This involves two breather tubes and two allen head bolts. Once the tank is off its only 5 minutes to get the rest off. Keep in mind that on a 4 stroke it hits TDC every other turn of the crank. The punch marks on the cams will be at 9-12 & 3 oclock and the cam lobes will be pointing "out" on both cams. While your in there also check the valve clearances. The clearance is important and should be checked before problems start. Its a good idea to wrap the frames crossbar with Glad wrap etc. to keep dirt from falling into the open engine top. Have fun, easy process and a good way to get to know the bike.

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