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UPDATE #2 Gearing & Mods: While the 12 tooth front sprocket has a lot of benefits it is too tall for some extreme climbs. Turns out the CS splines on this bike & the Beta 80 are identical. I fitted a 10 tooth front & 59 tooth rear in 428 from the Beta along w/126 links of 428 chain. That puts me right in the middle between 9/60, too low & 12/60 too high. Now, first allows me to climb anything slowly, or nearly anything in second very aggressively. Down side is some loss of top speed in high gear & the suspension is back to feeling nearly as harsh & dead as w/the stock 9 tooth. The Betas stock 11 tooth would be an option for a smaller rider & will just fit w/out modifying the rubber guide as necessary to fit the 12. A second small mod was switching from the quick turn throttle tube (white) to the ultra quick throttle assembly (part # 70129) from the Gold. I ordered the throttle assembly only & not the fancy bearing end cap ($) that supports the end of the tube. Instead I used the S3 End-5 bar end set. Since the first 4000 rpms are unusable, making whiskey throttle & herky jerk moves near impossible, this is a further improvement in responsiveness & rideability.