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Kevin makes a good point about the 1.00 ratio, evenly divisible, each of the same teeth see contact with each other every revolution. This might cause a fast wear pattern on the teeth. But in 4th gear seems OK compared to having a 1.00 in 5th gear position. You stay in 5th under load way longer that all the other gears. And yes, QQ 4th (1.00) was a stock gear in some of the 915's.
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Mark Jung
Bend, OR
MFI Werks.com
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