Didn't get a chance to look at it yet - i just managed to pick it up today from where it broke down. The only suggestion I've gotten so far has been that maybe the chain jumped the primary sprocket and bumped the case hard enough to break it...I'll look tomorrow and see but, the chain was a bit loose when I got it today so that might just be it.. Still looking to get a replacement though, come on guys! Someones gotta have something for cheap, right?