[Willy]

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

 

[bigblock]

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)[]

 

[CanadianXCR]

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.

 

[f5arcticat]

It might take so work but will be worth it, that would be the only polaris i would ride.

 

[OldCatRider]

It has been done.
A 670 into a XC.
Called a Rotaris.

 

[edtesto7719]

It has been done.
A 670 into a XC.
Called a Rotaris.

I own a rotaris

 

[edtesto7719]

I own a rotaris

Got it from vruwink industries

 

[billallen1116]

I own a rotaris

I still have the front half of my old mod-sled hillclimber, it was called the Pol-Cat, Polaris wedge chassis with a 650 Wildcat twin cylinder, supposedly built to a 720cc with twin pipe's, I never cracked the engine apart, but it always ran great, and other thing's people who I know have bought other stuff, and he wasn't lieing about those other part's, but who knows 🤔..lol..from Wyoming USA 🇺🇸🤠

 

[edmondpogi]

It is possible to transplant a Rotax motor into a Polaris chassis, but it may not be a straightforward swap. The compatibility of the Rotax motor with the 1999 RMK chassis would depend on various factors such as engine mount points, electrical connections, and fuel and cooling systems.

It's true that Rotax motors generally have a good reputation for their durability and reliability, but it's important to note that any engine transplant requires careful planning and execution to ensure it functions correctly and safely.

Before attempting any modifications, it's advisable to research and consult with experienced mechanics or enthusiasts who have undertaken similar projects. They can provide guidance on the necessary modifications and any potential issues that may arise during the transplant process.

The decision to swap engines depends on your specific goals and preferences. If you are willing to invest the time, money, and effort into an engine transplant, it may be a viable option to explore. However, it's essential to weigh the costs and benefits and consider whether the investment is worth it for your specific situation.