86 xr 600 bad 3rd gear

My buddy put a 660 kit from White Bros.in his 86 600. Fun power but he has had a bunch of problmes most recently a bad gear that broke and damaged the pison and cylinder. I'm just wondering if this transmission has any history of failing due to big bore kits?? Anybody have any experience with a 660 kit??

Thanks,,

hart

Early model XR600's had problems with 3rd gear. This is common.

Riding with Trailboss Tours I've seen lots of trany problems on high milage XR600's. When I rebuilt my engine I had to replace 6 gears thats 3x2. It cost about $100 each.

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