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
r6roadracer

Manual Cam Chain Tensioner

2 posts in this topic

Just an interesting piece of info...

My 98 WR400 engine has been jumping time on me recently. It appears as if the cam chain has stretched. While studying my problem I noticed the stock cam chain tensioner. I have always thought about putting a manual cam chain tensioner on the bike (as on my fzr1000 vintage racer)to replace the stock one.

Not sure how the stock ones hold up on the 400's, but the design on the yamaha 750/1000 street motors was lacking. It was possible for the automatic tensioner to momentarily retract (it would jump past the ratchet mechanism) and possibly allow timing to jump. Hence most hopped up 750/1000 engines went with the manual cam chain tensioners.

Guess what... the manual cam chain tensioner from those bikes fits the wr400 (and 426 I would assume) without any modification whatsoever, same gasket and all.

I know the manual tensioner is higher maintenance, but it always gave me piece of mind knowing it couldnt back off momentarily.

The one I used is made by APE. Any year FZR1000 will work.

Share this post


Link to post
Share on other sites

My trusty old 98 WR also got a sloppy cam chain after about 6500 miles. While the cam chain did have wear the main problem was the guides wearing out. If you do a major overheat with the coolant blowing out of the catch tank chances are the guides are cooked and no longer in their original shape. This is what made my cam chain a rattle monster.

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