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I'm thinking of getting my primary sheave milled and a better spring on the secondary... but will doing this void my warranty?

I want to do this as i found out it will increase the low end and they mill it in such a way that i will still have optimal top end speed. the low end will help with it bogging in the deep water i believe as well as make it pull wheelies easily. so am really interested in doing this, just concerned about the warranty. anyone know? i suspect it'd void it...
 

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Milling the stock sheave may be an issue. Any spring or weight calibrations should be fine. If you switch out the primary weights for 18 gram weights, you will have the same calibration as the Grizzly which should be more than enough for most "normal" sized tires and riding. People mill sheaves when they need to pull really big tires in really muddy bogs. Shimming is the poor mans way to achieve what cutting a sheave will do. If you really want a cut sheave, I would go with this outfit. They give you a milled out sheave, weights and spring. You get everything in one package and you can keep your stock sheave stock and in the tool box. A setup like this shouldn't have any bearing on warrantee IMO. Again, unless your trying to accomplish something in particular, I'd try some Grizzly weights first, then go from there. I'm sure you would get a wheelie machine and save a bit of coin.
http://www.jbsperformance.com/yamaha/clutching
 

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