Last year on my 380 I put about 4000kms in about 2-3months, and I drove the p!ss out of it, jumped, pinned to try and keep up with other people for miles, through deep snow swaps, on lakes, poker runs, through that I had trouble on the rewind(to much arm muscle I guess, lol) and I blew the right side piston, I don't know why the right side, that is the side closer to the fan. But I figure if a sled can last me that long, it is tough and reliable.
503 fan and 583. I'm betting they are as reliable or better than any 4 stroke. I have a 503 with 20 000 km and never touched the motor, It's my work sled and you wouldn't believe what punishement it goes thru. The 583, tons of power, incredible millage and will easily last 15 000 +km before anything is looked at.
I once had a skidoo safari 377 fan. That thing was a blast 10500rpm on the tach this is not a lie needle was always pinned. Beat that motor and sled to sh!t and she still ran excellent. Never had a problem with the engine. Two words bullet prove and I am a Polaris man so this is very hard to say. I still miss that old girl she was a blast to ride. ???
My Doo 600 twin has almost 9000 km's on it and still runs flawless. Never ever fouled a plug. Used regular oil for break-in and after that nothing but amsoil ever since. Always ran premium gas and always ran it hard. So far indestructable!
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