That way I can have all my parts ready to bolt on without putting the bike out of service. My plan is to have the spare 200 cylinder punched out to the next oversize and rework the head. How can I tell for sure what I have? Will the jug from a 200 fit on a 185 bottom half? How about the heads? Can I put a 200 head on a 185 cylinder or visa versa without having compression problems? I also have a 200S engine in pieces in a box, or at least the guy I got it from said it was a 200. Which ever motor it is, 185 or 200, it is in need of a top end rebuild among other things but it does run.

That may or may not be true and carbs can be easily swapped but it has given me reason wonder. The Honda dealer said the carb appears to have come off a an older 185S because of the push in verses screw in idle jet.

I have an 1984 Honda 200S which may or may not have a 185 engine on it.