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sprocket-chain on '03 rm 125???

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i currently have a 520 ERT2 DID chain (120 link) and a 52t, sunstar rear sprocket. I was wondering if a 49t (stock size) sunstar sprocket would fit on with the same chain? The 52t is probably the largest one i could squeeze on it if that helps.

One of my friends is moving up from his cr85 to a 09 crf450 so i might try to gear it a little tall to keep up with him when i go over to his house but want to be able to smack on the 52 when i want to hit the trails at my local riding place.

Thanks:ride:

-Zach

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the 49 may be ok if you run the sprocket back all the way in the adjustment...if your chain is stretched much its prob gonna be to loose...but give it a try, you can always buy another chain if you like the 49 that much, but its gonna take alot of grunt away from a motor thats low on grunt already

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One of my friends is moving up from his cr85 to a 09 crf450

Thanks:ride:

-Zach

your friend better be ready for a huge jump in power!

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ohh yeah, he is. He also be ready for the weight change! hes 15-16 though so i'm sure he is.

Maybe i should go with a 50t instead of the 49 to keep a little more of the grunt and the same chain.

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you could also try and change the front sprocket i believe its one tooth change in the front is equal to about two in the rear and by changing the front you could probably get away with the same chain

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not a bad idea, especially since that means more chain contact on the sprocket and loads cheaper.

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just remember its the opposite of the rear...for more bottom its down in the front....more top end its up in the front.....and the opposite for the rear sprocket

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