I spent 7000 miles with an M-10 on an MXZ 670.
Yes, an M-10 is HARD on a track. You can get about 5000 miles out of a studded track with an M-10 that is used hard like mine was. And yes, an M-10 slows you down. It's not about the track or the rear wheels, it's the angle of attack on the slide rails. I lost
8 mph with my M-10 that I couldn't get back with porting, pipes, 44mm carbs, etc.
I learned more than I care to remember about my M-10. What I learned, I learned from Brad Finkbeiner of Brad's A/C Performance and the inventor of the BLT Front End that FAST sold for a while.
When FAST's pathetic customer service (kids!) couldn't figure out why my M-10 rode like crap after one weekend, and when I couldn't either, and after they soaked my for multiple shock rebuilds and extra "updated" parts Brad knew what it was right away.
The cords in the track were breaking and the track is an intergral part of the parallelogram workings of a sled skid. Sold Brad sold me a new track CHEAP! And all was well.
Last thing he told me was to set the track tension loose as I could, to the point of the drivers stripping, then tightening it up until they stopped stripping. He said to IGNORE any written info on it.
Brad is the only guy I know that has an M-10 in a Firecat, he had to narrow it down to fit :div20:
He has some other M-10 tricks up his sleeve too. He's the only guy I ever seen that could get a good wheelie with an M-10