Aim your huckleberry Rotax 440, I have one from k&t I love how there’s a lot of people speculating on this motor hit me up at [email protected] for any questions i would not trust many on this built. I have been out of the game for a good 15 years and mine has been sitting this long I hope this thread is not old. Out of Utah Kim from K&T racing is one of the few builders I would trust Dennis Packard Ent. Has had one of the fastest cingle cylinders on this set up there was a person out of Oregon by the name of Pete that also had one of this engines, another person by the name of sunny out of pismo beach California had one of this engines another was the wrinkles out of palm desert ca also had this engine set up they race in dome valley az so if I can help I be glad I have a spare cylinder and a blank dome to be cut to your specs.Does anyone know anything about the Rotax 800cc snow-mobile cylinder swaps onto the 250R? I think Packard and a few others have built them. Considering building one...interested in knowing what year machines the cylinders come off of, pv or non pv, what rod to use, original engine stroke length, etc. etc.