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2013 RMK Pro 800 Engine Swap?

Long time lurker and brand new member! I've been borrowing sleds a good bit over the last few years for ski access and have an open offer of a buddy's 2013 RMK Pro 800 155 if I repair it... He roasted the motor last spring and it has sat outside a sled shop since then - quoted $3500 for a complete rebuild. He believes that the mechanic said the issue is that he threw a rod/piston through the block (he isn't into wrenching so that may not be the correct engine failure). My questions for you good folks are:

1. How involved is a motor swap? (I'm comfortable car mechanic but haven't touched sleds before... let alone a motor swap... and any specialty tools required?)
2. What should I expect to pay for a rebuilt motor and are there any sources you'd recommend? Or should I try to find a used one?
3. Anything else I should do while I'm in there for longevity's sake?
4. Is it worth it?

I've got access to a dry garage to do the swap in and if it can come in below $3k plus a little sweat-equity to have the sled up and running for another few seasons it seems like it'd be worth it? Lemme know and thank you for sharing your knowledge!
 
it's an easy swap 4 or 5 hrs at most be sure to add oil to the first tank of fuel and burp the cooling system
 
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