My 01 MM 700 has 10,000 km on it. I use it as a general purpose sled - trail riding, mountain riding, tripping around, hauling lumber, felt, oil, etc to our cabin. I lost the original yoko track at 69 km, replaced it with a camo 2" agressor and ran that for 6000 km without damage, then went to a 144" with 10 tooth drivers for 2000 km (track was off a summit and had three lugs damaged when installed), and now I am running a yamaha 1.1".
At 9000 km one hand warmer failed. I am on my second belt, and a fresh set of plugs each fall.
Hyfax were changed each fall when I was running the 2" tracks. I have not change them since I went to the lower profile treacks.
In adition, I changed drive shaft bearings when I installed the yami 1.1" track (bearings had not failed but the shaft was out) and replaced the suspension bushings at the same time.
It is only now that the I am concidering rebuilding the clutches.