Yamaha Sport ATV Forum

Rear sprocket size

This is a discussion on Rear sprocket size within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; I ordered a very good condition used rearend off e-bay. I recieved it today and it has a 43 tooth rear sprocket. my question is ...


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Old 05-11-2011, 07:09 PM   #1
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Default Rear sprocket size

I ordered a very good condition used rearend off e-bay. I recieved it today and it has a 43 tooth rear sprocket. my question is what effect will the 43 tooth have versus the stock 40. Thanks for the help!
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Old 05-11-2011, 07:16 PM   #2
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it would be about the same as a 12/40 setup. You'll have more low end but will lose top speed. And with sprockets you should use your old one, and when changing sprockets change both and the chain at the same time. They wear together and swapping them will cause the sprockets and chain to wear out faster
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Old 05-11-2011, 09:30 PM   #3
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Thank you. Thats exactly what i needed to know. I'm going to replace all three.
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Old 05-13-2011, 05:17 PM   #4
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greetz... hi guys... i have a question i have a yfm 350 2008 & the rear sprocket is also not good need to change this. Which brand is a good one & also which chain should i buy? do i have to leave the sprocket like it is or change it?
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Old 05-13-2011, 10:48 PM   #5
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.......

Last edited by elwood; 02-08-2014 at 10:55 PM.
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Old 05-14-2011, 01:20 PM   #6
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thx man....will take a look at those...
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Old 05-14-2011, 02:53 PM   #7
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I use this chart at work all the time thought it might be handy for anyone wanting to look up sprocket gearing.
Gear Ratio Chart | ProTaper
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Old 05-14-2011, 07:15 PM   #8
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Nice chart Thanks
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