Well I did here back and they wanted pictures of the sprocket so I sent them a couple showing the chain not fitting right then i got a return auth# but they wanted it reassembled so they could send it back to manufacture so I did and boxed it up for shipping, Post office wanted $40 shipping, wont fit in there cheaper flat rate boxes being reassembled . BMI would not send a return shipping label. Finally I told them I was done with it, spent to much time and money all ready, to get it taken care of or I would turn it into paypal . The to cover there rear responded with after they inspect it if it is bad they would refund shipping and send a new one . Interesting they could not say and do that to begin with instead of wasting my time . At this point I just dont trust them to to the right thing, I think I would be out more money they would have the gear box and give me a bunch of bull that with and engine hooked to it it would spin past the bind .