its prolly just the juetting!!! the brutes come 650's come from the factory REAL lean!!! i had to rejet one of my friends 08' 650 shim the needle .020 and go from a 40 to a 42 piolt jet AND back the fuel mixture screws out 1.5 turns!!! hope this helps ya out...but now his runs like a raped ape

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2009 Can-Am 800R XT
Ricochet Skids
HMF
26" BH on ss312's
stealth snorked
PC III
whelen D4 and 2 tir3 strobes
Gade Pegs
Kimpex rear box