HELP 250f 5th gear problem

My buddy has a 05 yz250f we where riding yesterday and he said his bike was slipping and surging. I first thought he was missing some teeth on one of his sprockets but they where fine. I took it for a ride it went through the gears fine untill I hit 5th. It was like it was missing teeth in 5th gear, is 5th shot requiring a trans rebild or should I check something else? any help will be great. Thanks

My buddy has a 05 yz250f we where riding yesterday and he said his bike was slipping and surging. I first thought he was missing some teeth on one of his sprockets but they where fine. I took it for a ride it went through the gears fine untill I hit 5th. It was like it was missing teeth in 5th gear, is 5th shot requiring a trans rebild or should I check something else? any help will be great. Thanks

does the engine race then re - engage ?

only on fifth sounds like time to split the case .. bummer

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