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
quadtrac

2003 450, 4th gear problem??

5 posts in this topic

I have an 03 yz450, and it runs and drives perfect until I get into 4th gear. Then it seems like it jumps in and out of gear, kinda like if you were pulling the clutch in and out while on the throttle. It is really bad if your about 3/4 throttle. Does anyone have an idea? Thanks

Share this post


Link to post
Share on other sites

The locking lugs on the gear pair that locks the trans into 4th (3rd and 4th pinion gears, on the mainshaft) are worn, and have lost the undercut that makes them hold in gear. In fact, the undercut has worn into an overcut, so that the two gears actually push apart from one another against the shift fork, causing them to become momentarily disengaged until the shift fork springs them back into engagement, producing the jerking feeling you get here.

The shift fork will have been bent by this condition, and need replacement as well as the two gears involved.

Share this post


Link to post
Share on other sites

Just wondering about what you said about the problem with my tranny. Is this a job that the average person could fix by themselves, or would I need to take it to a shop? If I did take it in, what would you guess that it would cost to do? Thanks alot

Share this post


Link to post
Share on other sites

It's a major tear down; engine out, top off, cases split. A capable home mechanic can do it without too many special tools, but it's fair to say it calls for skills that are above today's average. No guess on prices. You'll have to call around. Won't be cheap.

Share this post


Link to post
Share on other sites

You may want to consider going up a generation to an 06+, I know that on alot of the older bikes you have to begin to think about the value of putting 1000+ into busting open a bike that might not be worth it in the end.

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