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I've got an 1999 rmk chassis I was thinking about building up if things go salty with my '98 powder special I just got. Now I've heard about dropping a rotax motor (670 and so on) into a polaris chassis I'm just not sure which chassis this motor can be transplanted into with ease. So would a rotax motor from the '90's and up be an easy swap into a gen II '99 rmk chassis. I don't know much about ski-doo and the rotax motors in general but I've heard they have less problems with their bottom ends than polaris did in that era. I'm not against dropping a polaris motor back in, I would just like to explore my options especially if the rotax motor cost less and wouldn't take a whole lot of work to drop in. Thanks
 

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Forget about a early-mid 90's 670 rotax and put in what was meant for it. The pre VES "bigblock" 600 or 700 polaris mill. (where i'm from putting a rotax motor in a polaris is punishable by death i think)[:D]
 

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What you "heard" is conjecture and not factual, most likely came from some backyard wrench juggling drunk. Save yourself alot of stress, time and money and get yourself the correct motor for the sled. Domestic twins can throw down some serious power with some modding and still be reliable if done right.
 
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