I think there was a Zeel for the 250R before but it wasn't as advanced. Not trying to make a pun eitherSo this is all new just came out last week. For what I want I don’t want the smaller flywheel I’d rather have the better low rpm luggable engine and slightly less of a hit for the loose hard pack desert and Rocky trails but I can see where other ppl might want less flywheel weight to. Also the fact that I will be running lights, battery and possibly a small fan. I will be doing an update on what I think of it here very soon as long as I get my other motor running perfect so it will be a fair comparison to OEM.