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Discussion Starter · #1 ·
i bought a used 2007 yfz and had it for a few months and i was driving it down the road and the transmission locked up. took it apart to find the 2nd gear was welded right to the shaft. got all new parts and had it put in by a friend of mine and we made sure it was 100% right. got it back rode it for another 10 min and the gear welded itsself right back on the shaft again. anyone have any ideas what it could be at 400 a pop for parts i dont wanna put it back together again for the 3rd time to have it happen again.
 

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Sounds like an oiling issue. There is an oiling shaft that goes right above the tranmission gear set. I'd make sure that isn't clogged.

While the motor is apart, make sure everything is clean and, there isn't any shavings in there.
 

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Discussion Starter · #3 ·
i checked that before i put it together the first time and checked it again when i took it apart this time and it was clear. but it did notice that my oil pump was all scored up and whatnot.
 
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