Crf450 chain occasionally slaps tire

[red_rider5]

I have a 07 crf450 and the chain tends to rub the rear tire. I basically tighten the chain after every ride which is annoying. And I also checked the offset of my warp9 wheels. And the chain and sprockets have lots of life left. I built a small chain guide out of aluminum which has helped big time. Would going from a 120 tire to a 110 be best? Any suggestions would be greatly appreciated.

[gimped up]

Probably installing wheel bearings would help!

[Groves238]

I have a 07 crf450 and the chain tends to rub the rear tire. I basically tighten the chain after every ride which is annoying. And I also checked the offset of my warp9 wheels. And the chain and sprockets have lots of life left. I built a small chain guide out of aluminum which has helped big time. Would going from a 120 tire to a 110 be best? Any suggestions would be greatly appreciated.

Are you running a oring chain or a non oring chain? The oring chain is wider and will hit your tire easier under deflection. You can also see at the front sprocket the the chain rjbs on the cases a little bit.

[FORMA MOTO]

If you are 'tightening the chain' after every ride, you will be putting way too much stress on the countershaft and countershaft seal, if you over tighten it.....

There is only one correct chain tension, per the manual.

If your wheel is not perfectly aligned in the swingarm, the chain will 'snake' and wear out quickly, and start hitting the tire.

You cannot trust the adjust marks to be accurate.

Edited June 7, 2013 by Krannie

[adam8781]

takes a large amount of chain slop to hit the tire.

what chain is it? if you have to adjust it every ride to keep it within spec than sounds like its time to throw it out and get new chain/sprockets.

[capt justin]

chain sounds worn out to me.

[ramjetV8]

my 06 was doing the same thing and hitting the shock protector flap. put on the new Rk X-w Ring and only had to adjust once after first ride. has 3 rides now and still has not needed adjusted again. Put on new shock protector and tire and all is good using the marks to adjust. the old original DID non oring chain was garbage.

[myth]

I have the same problem on my 07. Every chain Ive had has done it. Ive been through the stock cahin, a Renthal works and now Im on a Regina non o-ring.

[teamgreen]

Your chain is done.

Go get a new one (and sprockets while you're at it).

[BraaapOn]

the 120 tires are known to get in the chain. I run the 110 for that reason and I like the handling and tracking of the 110. my chain was rubbing the inside of the frame at one point but that's because it was too loose. those oring chains are also a bit wider than regular ones.

[red_rider5]

I run a rental works chain. Non oring. They are fairly new and in great shape. It's just frustrating.

[red_rider5]

Also, I don't know if this means anything or not. I put a black renthal sprocket on the rear wheel. And the paint is worn off the inside from the lower swing arm chain guide.

[red_rider5]

Been working on the bike a little. The chain alignment is perfect. Is it possible the the shaft the the small sprocket is on be bent upward, causing the chain the slap over. I'm just out of ideas. Thanks for any suggestions.

[edge22]

Pretty sure the honda's are known for this. My 11 does it also. The 13 has a different wheel offset and I bet it helps with this.

[TX-SANDMAN]

I am having the same issue on my 07 Crf450r ... chain hitting my tire and chewing off the left side of a brand new Michelin S12 130/70-19.

is anyone using a swing arm slider that has a shoulder to keep the chain in line?

 

[ramjetV8]

Chain not tight enough. Set it per spec. I keep mine right at lose end of range stopped hitting

[ramjetV8]

1 3/8" bike on stand pull / push hard on the chain to get accurate measurement.  I think spec is 1 1/4" to 1 3/8", once you hit 1.5" or more it hits tire 110 size.  and the Michelin 130 is same as other 110 they just measure at different point or some such nonsense.  Mine will do it new RK chain, new sprocket and same Michelin 130 size or 110 Dunlop if chain gets past 1.5" slack.  Or just Ricky Bobby and only turn left LOL....  And trust me 90% of people do not push pull hard enough on the chain when checking the slack, so often the chain is just not tight enough.  Given the already tight clearance it doesn't take much and it happens on deceleration not on acceleration.  Little chain whip goes far enough to hit.  Try pushing/pulling hard when you measure, I guarantee your not pushing pulling like your engine does, I bet your more like 1.5 to 1.75"

Edited June 21, 2017 by ramjetV8

[SlowDinoDog]

I've never had a problem on my '05 running Dunlop and Maxxis 120's and DID o-ring chains.

As was mentioned, needing to tighten your chain after every ride is a symptom something is wrong.

Seems like after installing a new chain, I have to adjust it after the first ride, then its just periodic maintenance.

Have you tried new a swing arm chain guide, rollers, and bottom chain guard? How old/worn are they?

Also, don't over tighten the chain...it will keep stretching and you could damage the countershaft bearing...

 

[TX-SANDMAN]

many bike like some KTM use a swingarm slider with raised rails --- supermoto guys use theses too. 

[TX-SANDMAN]

HERE IS THE ONE WE ALL NEED TO GET:

http://tmdesignworks.com/index.php?main_page=product_info&cPath=36_37_38&products_id=86