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
tmgolden

Countershaft Sprocket Seal go bye-bye

5 posts in this topic

Anyone had there countershaft sprocket seal blow within 50 hours of use? Symptom: just rev the bike and watch the oil stream out from behind the seal retension plate!

I'm hoping its just the seal. If not, does this mean pressurized crankcase = something is blown = $$$?

Share this post


Link to post
Share on other sites

The first and most common question is How tight do you run your chain?

Seems to me everytime this question is brought up, that is the answer.

Share this post


Link to post
Share on other sites
If not, does this mean pressurized crankcase

Check to make sure air is coming out of the crankcase breather hose. It comes out of the valve cover and drains down along the left front frame rail just in front of the ignition cover... it's the one that usually leaves a few drips of oil in the back of your truck after riding. As long as that is clear and flowing then you don't have any pressure problem and you probably just picked up a little piece of debris that got stuck under the lip of the seal.

Share this post


Link to post
Share on other sites

I ran the stock chain until the chain adjusters were about 3MM from full rear stop. Figured it was time to replace. Put on a new gold series O-ring chain and adjusted per factory manual checking for tight spots all the way around. Rode bike and blew seal. Checked the breather - it appears to be clear.

Maybe just a blown seal. I'll order part and replace.

Share this post


Link to post
Share on other sites

I read an article in Dirt Rider on time where they raced the 400 in one of those long desert races and the only thing that failed was the contershaft seal. They figured a stick (in the desert?) must have punctured it or something.

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