2003 Yz450f help needed

i just bought a yz450f in september and this last weekend when i was in this indoor place...i noticed after i was done riding that the tire really rubbed on the exhaust...so i looked and i noticed that looking from the rear of the bike on the left hand side on the chain adjuster it has a big notch in it and i was wondering if that counts as one of the notches for the adjustment because i think the right side had one more notch compared to that side but idk. please help i am going riding this weekend and would like to fix this soon. Thanks for your help

:thumbsup:

Don't put a lot of faith into the axle blocks for chain adjustment. Use them to get you close and then step back and take a look down the chain. It should be straight from the rear sprocket to the front sprocket. If not, then adjust it so that it is and you still have the tension you want. Hope this helps.

Josh

Also, did you dump hard enough to bend your rear swing arm? That can also cause the tire to rub the exhaust.

no i only did one run and its brand freakin new bike i only bought it from a guy who put 5 hours of riding around his house...never saw a jump... I came up short on a double a bit and my front tire just barly caught and it sent my body weight forward and i just kinda went over and to the right side when i fell.....i dont think i could have bent the rear swing arm....it barely got hit.....it never did it before that day either...it was my first time at an indoor place.....also i took it out the other day and i noticed it did it again so idk....what do ya think just the adjustment might be out b/c the tire in between the swing arm doesnt look centered so i think i might have set it to that little notch....im ganna go out and check a bit here so yeah...what else could it be?

One of 4 things. Chain not adjusted correctly allowing the axle to be cocked to one side in the swingarm. Swing arm bent causing wheel alignment to be out. Wheel bearings bad allowing wheel to move enough to rub the exhaust. Or the exhaust got pushed into the tire and now it is bent enough to allow it to rub. Let us know what you find, and if you can post some pics. Hope this helps.

Josh

Don't put a lot of faith into the axle blocks for chain adjustment. Use them to get you close and then step back and take a look down the chain. It should be straight from the rear sprocket to the front sprocket. If not, then adjust it so that it is and you still have the tension you want. Hope this helps.

Josh

DITTO!!!!!!!!!!!!!!!! :thumbsup:

Is it just your tire rubbing on the exhaust? When i first got my 03 it was bottoming like crazy and there was all sorts of scratches from my tire. The scratches where kind of in a circular shape. What really scared me was the big dent in the can but i was told on here its room for the brake caliper. Do you have a picture?

If it really bothers you, you can always buy and aftermarket slip on; i recomend the fmf factory 4. :thumbsup:

You probably bent the subframe or just the exhaust bracket.

I will try to get some pics of it...I found i tonite that i did tweak the sub fram and the right side needs to go over 3/32 of an inch and the exhaust is just tweaked a little...what would be the best way to bend it back...the way i thought would be in a vice or a rummer mallet....please help.....

PLEASE HELP AS OF THE BEST WAY TO BEND IT BACK WITH OUT IT SNAPPing........some of my freinds have had them snap in the past so what would be the best way to preven that since they are 326 BUCKS NEW!!!!!

I don't know if you will be able to bend it back, aluminum doesn't like to do that. However, I just checked Yamaha's website and the 250 and 450 for 2003 use the same subframe. I also looked on e-bay and there are several subframes on there for much less than new. Hope this helps.

Josh

where did u see those because i cant seem to find them under either listing????????

I just searched for "yz subframe" there were about 30 of them.

Josh

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