Trying to identify the engine model as the bike has a different engine than the original. We were told it was out of a 91 model. Haven't looked into it before now, need a cam chain & want to make sure I get the right one. The engine No. is 1HX227424 I think it might be a 3LN1 ? All the tables refer to the chassis numbers not the engine numbers or is it supposed to be the other way around. It's in a 89 chassis according to the compliance plate.