125 1st gear knocking?

I just bought an '07 125L. It's really clean and starts up on the 1st kick, but it has a weird noise in 1st gear. The seller said it was chain slap, but there is less than 2" of slack and it doesn't make noise in any other gear.

Could it be worn gears? If so, what am I looking at spending on parts? 



Does it slip or jump in first? 

Nope, just makes that noise. 

Check out this thread out, my son's has this issue and I'm looking to tear it down this winter to fix.


That sounds just like mine.

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