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
msteele

2006 YZ450F Chain Tension

9 posts in this topic

I just moved from a Honda CRF450 to a 06 YZ450F. The Yamaha book says to run the chain tension between 1.9 inches and 2.3 inches. Honda recommends between 1 inch and 1.5 inches for the CRF450. What is everyone running on a late model YZ450F? 1.9 to 2.3 seems like an awful lot of slack. Everyone at the track keeps telling me to tighten it, but I tell them I am running it at the recommeded spec. If there is already a thread on this, I apologize, but the searching was disabled.

Thanks

Mike

Share this post


Link to post
Share on other sites

Yea, there are alot of threads on that subject. I think it is too loose so I tighten it just a bit. Make sure you check the chain tension by rotating the rear wheel one revolution. Good choice red to blue!

Share this post


Link to post
Share on other sites

Sit on the bike until the swingarm is level and see how tight the chain is. The manual is most likely correct but this method will ease your mind if you are worried. Too tight is not good, stretches the chain and loads bearings on jump landings.

Share this post


Link to post
Share on other sites
Do what the manual tell you to do. I run mine at about 2-2.1 inches, and never had any issues with it. The Yamaha isn't a Honda.

ditto...

check out the manual all the specs are in there....

Share this post


Link to post
Share on other sites

I run my chain at 2 inches slack. If you tighten it much more than that when your rear suspension compresses, the chain will tighten up too much. Plus if you keep your chain tighter than spec, it will stretch twice as quick.

Share this post


Link to post
Share on other sites

The manual is correct, 1.9" is the minimum. To go tighter than that is to invite a broken rear hub. With the rear suspension fully extended, it does look as if it's looser than it should be, but it's the right amount of slack for the exact reason that mxracer206 brought up; there needs to be a minimum of 5/16" actual free slack at the point where the centers of both sprockets a nd the swing arm are aligned.

Share this post


Link to post
Share on other sites

I use the 3 finger rule at the rear of the top chain slider - my fingers measure approx 2.1 inches

If you go too loose - you will get wear on your frame - above the chain slider

Share this post


Link to post
Share on other sites

To find the perfect adjustment you should remove the shock and lift the rear wheel up and down through the complete travel. when you find the position that the chain is tightest adjust the proper amount of free play. Then reassemble the bike and check your slack. That would be the optimum adjustment for your chain. The only variance would be if you were riding in muddy conditions, then you would need to give the chain more slack.

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