M Series Secondary Fitment

[Radar78]

I need to replace the secondary on my daughters 07 M6. I assumed the secondary from any M would fit but there seems to be many different part numbers. What are the differences?


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[boondocker97]

There was a change to the sheave diameter from 10" on the 05/06 to 10.4". Not sure if that was in 2007 or not until 2009 when mechanical reverse went away. Not sure if the mechanical reverse models are built different than other years in general as I never owned one of those. 10.4" sheaves are considered an upgrade over the 10", but I recommend changing the belly pan if you do the conversion to get enough clearance under it. I did on my M7 anyway. 10" vs 10.4" also takes a different belt and alignment bar to set the offset. Tape measure should give you a quick check on diameter of what you have currently.

 

[Old & slow]

The 05 and 06 had the adjustable spring in the helix. That makes the helix different but they are still interchangeable. One thing i remember is to get some allen head bolts to replace the torx screws that hold in the helix. They have blue loctite on them also, using heat will help with removal. In 07 they used a 36 degree helix and the same spring on all the mountain machines so there is room for improvement.