I have close to 7K miles on my 2020 850 XC currently that came with the factory 4 year warranty, I bought the sled a year old so had the remaining 3 years on it. I used warranty once on a Quebec trip when the jackshaft bearing came apart on me. I bought a '25 9R XCR in the Spring off the dealer floor & got a 4 year warranty with it, 1 year Polaris & 3 year aftermarket more for peace of mind on trips & the fact that I can't rebuild these sleds anymore. I would guess you'd be over $4k for motors these days at a dealer to either rebuild or buy a new block & install. 

Your case I wouldn't worry about it. I personally think if anything going to go wrong, it would have happened by now. Mines out of warranty too. Between two probably save enough to rebuild one if it ever happened. These engines for two strokes  are very reliable. Not many having trouble besides odd manufacturing defect. 

Wife gave me this for christmas. Testing follow mode.  

Under 1k. Heading back to work on Sat, not home until the 21st for a week, then gone 2 weeks and off 2 weeks to end my season up north. So if we have local riding then maybe get it up to 2500 this year. Local riding is a crap shoot.

Wow. Back when I was riding 6k kms per season a warranty would be worth it, then again a 4 stroke would be the best option if keeping it.