Might have 2 change to 4 stroke :(

My Plan is to swap in a 660 , and add a 4 gallon tank , tons of power , electric start and extended range with the extra gallon of fuel . I know its a 4 poke engine , but its still a blasty frame . Plus the reverse will be cool too ....

waste of time and money, just get a raptor, it'd be a better bike all around, not just the motor imo. and if you can find one, get the 700 :) I've had my 660 for a month now and have been trolling the raptor boards now and can comfortably say I'd throw my 660+ cash for a 700... reverse is probably my favorite part of the bike currently lol. I like my ltr better for the most part lol and it clearly doesn't have reverse lol

as for the original topic, sounds ify to me. I'm personally happy with pump gas. and the gas is rated 105oct on a different scale and is gonna be lower when rated on the same scale as pump gas ;)