Yz426f 4th gear problem

When I'm riding n hit 4th it's like it's in neutral but when I'm wot in 4th it like jumps. And if I down shift just coasting 4th gear slows me down but if I hit the gas it does nothing?? I'm confused any thoughts on what it might be ? Thanks ImageUploadedByThumper Talk1423674750.177837.jpg

Damaged 3rd and 4th gears on the main shaft and a bent forward (#2) fork.

How much $ in parts u think? Just a ball park

Probably about $300 if no bearings are replaced.  It requires a complete tear down, so you'll need at minimum two gears, a fork, and a full gasket set, oil, coolant....

Ok thanks for the help

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