When you have the secondary apart, please brake clean it, get the rollers to move freely and if you have the time to remove the rollers from the axles and check for abnormal wear on the axles “shiny spots that don’t look symmetrical compared to each other”
Have a look at the roller surface for cracks and see if the rollers have been rubbing against the clutch wall casing.  That 07 secondary has been a dose for some people the rollers have failed and or they crack but keep on running however cause disaster
backshift.  Must keep that secondary clean every 3 or 4 rides.
 
Some primary clutch tidbits
2009 - What's new - Heavy Duty Bushing (sliding sheave)
Why - New material has excellent resistance to wear from heat and vibration and is well suited for the extreme use in the mountains.
BRP# 417223086 - Cushion


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2009 Technical Update - Page 35
What's new - Spring cover
Why - Bushing is "pre sized".  Bushing is more securely located in cap to ensure retention.
Update to BRP#417222759 - Spring Cover Ass'y
 
If your primary clutch wear parts are not that good of shape, then update to the 2009 xp primary clutch spring cover and the sliding sheave bushing.
Some of these covers have been too tight and almost bind on the fixed sheave.  Clean the burrs with emery cloth to facilitate an easier sliding fit of the cover over the fixed shaft.


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2008 Roller BRP#417223035
2009 Roller BRP#417222947 - If needing new rollers, then get this updated roller.

One of the best rollers out there is the original replacement roller for a 2006~0lder model that can be got from;

Canada http://www.cvtech-aab.com  (manufacturer of the BRP fiber/resin bushing roller)
#S417 003 900 - Roller Assembly

USA
http://www.fettbrosperformance.com/store/products.asp?cat=25&pg=2
#SKR155: Stock replacement TRA roller set

http://howardsinc.net
Bionic TRA replacement rollers

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Some crank tidbits
800R known for bad crankshaft wobble that contributes to excessive clutch wear and short belt life.
Get the clutch off the engine.
Get a dial indicator on the end of the crankshaft stub to check for crank end excessive runout. Crank taper may be out of spec and this will certainly cause excessive premature wear of new clutch components.

Put dial indicator 1/8 inch in from end of crank stub.
Maximum deflection PTO side is 0.06mm (.0024) engine type = ALL

I have had a customer who warantee a crank on an 08 and it took 4 crankshafts from BRP before a spec crank showed up - crank came in, checked runout,(.003+) sent it back   Nuther crank come in, again (.003+) sent it back, nuther crank come in (.0025) sent it back. 4th crank come in and (.002) The 4th crank came with less than out of spec runout.