I am looking for some insite on a tough crank for an 06 800 summit. I used to race snow cross with an 04 440 and i could not kill it, now I am riding primarily in the mountains with the 06 800 summit. My crank bearings failed at 4001km and i am know looking for a well buitl crank, something that can stand up to some fairly agressive riding! Does the crank case have to be line bored for my 06 800?? What are my options for a tough crank/ bearings. Any information would be greatly appreciated!! Thanks