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Everything Dirt Bike
Make / Model Specific
Yamaha
1999 WR400F
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<blockquote data-quote="ossagp" data-source="post: 219224" data-attributes="member: 1650"><p>I have often wondered how it held up so well considering it is really just the same and as the 250 two stroke and gets "hit" much harder than the two stroke ever would on each successive power stroke. in this case, ones would a heavier flywheel get the extra hit when changing gears.</p><p></p><p>I am not convinced any of that has anything to do with shift forks, other than the natural reaction of the gears themselves trying to separate dog from socket under force. In the higher gears where the gears are closer to the same size and torque amplification at it's smallest you would think the separation forces would be at their weakest as well. (ever notice they don't place the lower range gearsets in the center of the shafts?) But the force goes somewhere, and bent forks have always shown up more by popping in and out in the middle ranges for me. On the 5 speed yamahas and Honda 4 strokes I have had, it has been 3rd gear that pops in and out the most, as they age.</p></blockquote><p></p>
[QUOTE="ossagp, post: 219224, member: 1650"] I have often wondered how it held up so well considering it is really just the same and as the 250 two stroke and gets "hit" much harder than the two stroke ever would on each successive power stroke. in this case, ones would a heavier flywheel get the extra hit when changing gears. I am not convinced any of that has anything to do with shift forks, other than the natural reaction of the gears themselves trying to separate dog from socket under force. In the higher gears where the gears are closer to the same size and torque amplification at it's smallest you would think the separation forces would be at their weakest as well. (ever notice they don't place the lower range gearsets in the center of the shafts?) But the force goes somewhere, and bent forks have always shown up more by popping in and out in the middle ranges for me. On the 5 speed yamahas and Honda 4 strokes I have had, it has been 3rd gear that pops in and out the most, as they age. [/QUOTE]
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Everything Dirt Bike
Make / Model Specific
Yamaha
1999 WR400F
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