Check your carberator pilot jet. Also check your electrical like the coil, ground wires, stator, check for good spark, etc. Cold starts are rough and hard for fourstrokes like the raptor 660, but can be tuned to work better. I don't know anything really about the Yamaha Raptor 660R, but I'm just trying to help. Maybe give you something to look at.
2004 Yamaha YFZ450-Parting out
Last edited by 2004mxyfz450_racer; 10-22-2010 at 08:46 PM.