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Chain and Sprockets.

By BIGchiefKODIAK,
in WR400F/426F/450F

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BIGchiefKODIAK

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My chain was worn out and I hit a rock and bent my chain guide, the one in front of the rear sprocket. I purchased a moose guide and block kit, Regina o-ring gold chain, and 15 48 Renthal sprockets. I installed everything and the tab was bent for the guide. I bent it back until chain went in center of guide. went for a long ride and got this.

100_1074.jpg

100_1075.jpg

100_1076.jpg

100_1077.jpg

It is wearing everyother tooth on rear sprocket,stange. and wearing evenly on both side of new chain guide. The chain is also rubbing on tire and subframe. I could understand if somthing was bent it would wear out one side of sprocket and one side of new guide. I do not know where to start. bent hub, motor bolts are tight and do not look like shifted. do not know where to start. I guess i will get a straight edge. Unless somone has had this problem. Thanks for any help.

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CRF45OX

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tension your chain correctly and frequently while it is still new

when i got my bike the chain rubbed on the sub frame, i then tensioned it correctly and it stopped rubbing although i had to tension it about 3 times after each ride of a couple of hours because it was pretty much a new chain and it stretched alot at first.

a good way i like to tension the chain is lift up the back wheel so its off the ground and push the bottom of the chain up against the chain slider end where the bolt holds the chain slider on - then if the top of the chain is strait and tight then its right.

anyway tension might not be your problem but give it a try

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BIG HAL

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tension your chain correctly and frequently while it is still new

when i got my bike the chain rubbed on the sub frame, i then tensioned it correctly and it stopped rubbing although i had to tension it about 3 times after each ride of a couple of hours because it was pretty much a new chain and it stretched alot at first.

a good way i like to tension the chain is lift up the back wheel so its off the ground and push the bottom of the chain up against the chain slider end where the bolt holds the chain slider on - then if the top of the chain is strait and tight then its right.

anyway tension might not be your problem but give it a try

Yeah you'll have to tighten that regular chain every single time after a ride.. Why did'nt you get an O-ring chain?? This will fix the problem!! Do not buy an aluminum rear sprocket either unless it's an 80.00 good 1, I would get the Renthal Oring and the best sprocket you can buy.. If you get the cheap stuff then this is the prob you will get!! DID, Renthal

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GCannon

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You Have a Problem! Time for you to get on your knees. You have an alignment/tracking problem. The wheel is misaligned, the swingarm is bent,the chain guide is bent, i don't know wash your bike and find the problem.

Seek and Destroy! then post and tell us what the problem and the fix was!

Where is Bamster when you need him his chain is looser than that.

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bandit99

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It could be your wheel bearings are worn out and the wheel is wobbling when you ride. This could explain the every other tooth being worn and the chain wearing one side of the the chain guide. Just another thing to check. Check the swingarm bearings and shock bearings too. You my have too much play in the rear.

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BIGchiefKODIAK

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All my bearing do not seem to be worn out. The front tire is though. I put the new parts on and did about 150 in the desert and 120 on the freeway. I adjusted my chain. Just picked up a steel sprocket. Going to put it on tonight and see how thinngs go. I could not straight edge the sporckets, swingarm is in the way. The only thing I can think of is the chain had no groove in the new block and on the freeway at the right rpm kicked it all over. Does not seem to be doing that now? I will see what happens to the sprocket.

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wr450rideruk

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right just been studying these pictures,

hhas the sproket worn the other side (spoke side) the same as the outer ? if it has and it is the same tooth that has worn it sounds like wrong chain sproket combunation causeing the chain to stretch to the sprocket or sprocket wearing to chain asalloy is a softer metal then this is where most of the wearing will happen, check your front sprocket allso for wear but this should be a steel one so no wear, check the rear sprocket hhas 520 stamped on it and not 530 and check your chain matchs, thay could have been packaged wrongly.

not sure if the last picture is just camara angle but it does not look inline to me. try swapping or even just checking that the rear wheel spaces are the correct size (equal) as iv known one wear with a knackerd wheel bearing ,only takes 1 or 2mm and with you having the rear wheel off to fit new sprocket they could have been swapped causeing wheel to be shiffted over 1 or 2mm to the right or left wich also could be the cause of your chain to tyre rub or the incorect thickness of the rear sprocket pulling thhe chain closer to the hub bringing the chain closer to the tyre

check these and let us know how you get on

regards dave

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BIGchiefKODIAK

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Yes it was wearing on the tire side the same as the outside. I have a steel countershaft with no wear. everything seems to be fine now. The steel sprocket is thicker than the aluminum one. The only thing I have not replaced yet is the chain guide brackets. Figured I would keep it until I hit another rock.

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Fullbore4

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Thankyou BigChiefKodiak for posting the pictures and everything else in this thread. Its guys like you that make this site so valuable.

I had a similar problem with my chain and rear sprocket but not quite as drastic. My chain eventually came apart at the master link (I did have the master link on correctly), and luckily it didn't take out the casing by the countershaft. I have concluded that I did not have the 6 sprocket bolts tightened evenly. Hence the sprocket wandered side to side. I have a more solid steel sprocket that I will put on and I will make sure all bolts are torgued to 36 ft-lb in a criss-cross pattern. Then I will report back like you did.....thanks again.

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texas_hippie

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When you put those sprocket bolts in, don't forget to use some locktite! Retorque after a short ride, then again every few hours until you're sure those damn things aren't coming loose. Loose bolts are the quickest way to destroy that hub, and they're damn expensive. I use a product called torque stripe, that we use on helicopter bolts to insure critical torqued items are not moving. Basically, it allows use to see movement, when the stripes crack. The cheaper method is a blob of fingernail polish. Apply it to each bolt, and carry it onto the sprocket where you can easily see it, and if you observe a crack between the bolt and sprocket, you're loosing torque.

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Bamster

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Where is Bamster when you need him his chain is looser than that.
:applause:

Looks like your wheel is pulled to far on the sprocket side.

100_1077.jpg

Measure the distance from the swing arm pivot to the axel.

Don't go by the little marks on the adjusters.

Does mine look that loose?

IMG_1456.jpg

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