Wild Mango
Member
IMHO, and bitter experience: Keep in mind that if you buy a used gear, it must be in a set. Once a crown wheel and pinion have done a few miles together they are married for life. The only risk free way is to buy a new gear set. Unless you can trust the vendor 110% to sell you a true set, don't do it. By the time a mismatched set have started being noisy there is already all through the rear case a fine oil suspended grinding paste made up of the hardening wiped off the gears.