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
Beta_Man

colorless header pipe

6 posts in this topic

I just picked up my wr 450 and noticed that the header pipe has absolutly no color to it any more. my 2001 yz 426 header pipe is still gold or what ever color it is suppose to be. has any one noticed this. i know it is running lean on the bottom because if i let it idle to long it boils over. do you think any harm as been done.

Share this post


Link to post
Share on other sites

Do you mean it is silver...?

If it is silver, that is normal... it is only with heat and use that they turn gold/blue...

Don't worry about it, ride it and it will change colour...

David

Share this post


Link to post
Share on other sites

I would'nt let that beast boil over to many times, you stand a very good chance of burning a valve or two. A blue ring of the pipe is a very lean condition, too much heat. Cool it down with alittle more gas. These Yamy thumpers are not designed to idle, run them hard, a cool down lap and shut them down. Helps if you use a small stick-on temp gauge on the water jacket to record heat temp. Mine runs around 160deg. steading, 13.5 to 1 comp. piston, 4000ft.

Share this post


Link to post
Share on other sites

Just re-reading your post, and I have to add, you cannot say it is lean because it boils over when idling for long periods... no matter how rich you made it, it would still boil over... the radiators have a limited capacity, and no fan to draw air through them at standstill like a car... you're better off shutting it down if you are going to idle for more than a minute... they start up easy enough...

Don't let it idle for more than a minute or so... once you start moving again, and the air gets through the radiators, they cool down soon enough...

David

Share this post


Link to post
Share on other sites

I agree. These bikes will boil over when they are allowed to idle for any more than five minutes. However I do like to bring mine all the way to 145-150 degrees (water temp) before I take off with it. When the bike is cold my jetting is way way too rich. Bike runs like crap until it gets warm.

Share this post


Link to post
Share on other sites

Hey just remember that the pipe on the 426 was stainless. The wr450 is titanium. :D They will stay grey or blue. Good luck :):D :D

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