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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Wide ratio gearbox
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[QUOTE="Hick, post: 799295, member: 19514"] I don't have the '03 specs, but if they are the same as the '04, and I think they are, (stock gearing is 14/49) your YZ probably will not go much over 70 mph, if that (but opinions will of course vary). You should be able to easily find 48 & 47 teeth sprockets. Smaller than that aren't as popular but they do exist, I run a 45 on my CRF in some races. You should also be able to fit a 15 tooth counter sprocket on your bike... An easy calculation on the gearing changes is dividing the # of teeth changed by the original. So if you go from 49 to 47, you changed gearing (and top speed) by 2/49, or slightly more than 4%, going to 15 from a 14 counter is a much bigger change, 1/14 or about 7%. If you wanted to find the max. top speed your YZ is capable of 15/45 gearing will probably get you there, this is almost 17% taller and should get you into the 90mph range (but opinions will vary on this also). Hope this helps. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Wide ratio gearbox
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