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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
What causes Broken Gear Teeth?
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[QUOTE="darringer, post: 1095649, member: 26849"] Shifting under extreme load (pinned) without either a quick clutch pull or momentarily letting off the throttle is very hard on the transmission. Over time, the gear dogs round off a bit, and the gears don't fully engage. The end result is teeth break. Regardless of engine rpm, when shifting through the gears, the transmission main shaft and countershaft are spinning at different speeds, and without pulling in the clutch and/or letting off of the throttle to cushion the impact, there is a violent shock between the gears as they change speed. A good example of this was when I was a kid racing my '74 cr125, I would shift as you described above. The bike would shift great, even under full throttle. Needless to say, until i changed my shifting technique, I got very good at splitting the cases and changing gears. [/QUOTE]
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What causes Broken Gear Teeth?
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