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The new motor is very impressive, walks away from 09hcr & my 09m8, all are stock. I did swap track on cf from 1.5 cobra to the powerclaw. As far as cats high altitude clutching(9000- 11000ft) it needs some work. Peak rpm is on the money at 8300, but it engages at almost 5g's, more than 1000 too high. It has 58g for weights & black/orange spring. It's a different kind of power than the 09 motor, not as smooth, quicker rever always ready to scream. If anybody has any clutching ideas I'll try it. The m sleds are set up way different than the 141 crossfire for 2010. Belt wise the cf runs the 60 when the m's run the 46, why?