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crf450r chain noise

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Just changed sprockets and chain on my 07 crf450r. new JT sprockets, Parts Unlimited o-ring chain. Went 2 teeth up on the rear sprocket 13/50. Im getting a weird noise now that wasnt there before. Sounds like its coming from front sprocket or chain. Almost like a buzzing sound or constant clicking when riding. No noise when sitting still and idling. Can here it really good when going slow. Put the bike on a stand and cant recreate the sound. Chain is adjusted correctly and lubed, the chain is not hitting the case because theres no marks. Everythings torqued correctly.

I didnt know if this was normal for o ring chain. With stock sprockets and non o ring chain (that was streched out) i had no noise, didnt know if the o ring chain needed to break in or seat right. Racing next weekend, any advise will help.

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Just some guesses, basing on the only thing that change was the new chain/sprockets (asume everything else is ok like the lower roller).

look for a bind in your master link. Also, check that the wider 0-ring chain is not rubbing the engine case at the countershaft sprocket area, it could also be the wider chain is wearing into the lower chain guide.. OR, your chain is short enough that moving it forward, your chain/sprocket is now cutting into the back of the lower chain guide as A) the sprocket is bigger around and/or :smirk: it moved forward..

Flip the sprocket around if it's hitting the case, and if it is wearing on the lower guide a bit, i wouldn't worry too much. Upon the 1st time ya adjust the chain you should be ok, and by then some plastic will have worn from the guide.

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I took the chain off and looked for marks on the case because thats what I thought it was. There were no marks. I was thinking the same about the chain guide, I hope thats all it is, when I put the new bigger rear sprocket on, my chain adjusters are now towards the front. Before they were almost all the way out. I was worried because I thought it mite be my tranny or shaft bearing.

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I took the chain off and looked for marks on the case because thats what I thought it was. There were no marks. I was thinking the same about the chain guide, I hope thats all it is, when I put the new bigger rear sprocket on, my chain adjusters are now towards the front. Before they were almost all the way out. I was worried because I thought it mite be my tranny or shaft bearing.

Yup, I tried putting a 51 t on at a harescramble recently and without adding a link it would have been a no go. Was jammed into the back of the guide pretty good. Can add a 2nd master link (use an inner link from what you cut off the new chain) or, just spin by hand to be sure it isn't totally f-in things up, and ride till it wears in and you move the axle back when the chain needs adjusted after a couple rides..

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Thanks for the replies, I'll just put some time on it and then readjust. Makes me feel a little better. Should I just go ahead and race it? Im racing harescramble in Indiana

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Thanks for the replies, I'll just put some time on it and then readjust. Makes me feel a little better. Should I just go ahead and race it? Im racing harescramble in Indiana

I don't wanna tell you what to do in that respect. If your confident nothing else is damaged and the only thing that changed since the last ride is the new chain/spkts, I can't see any issue with racing the bike. spin the rear tire on the stand, and see how bad it is rubbing in the guide. Pics would be nice..

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