If my records are right the Polaris Blue/Green spring is rated at 5-117, which is a stall speed of 5 and a shiftout speed of 117. If it were me I would look around and try something with just a little more stall and shiftout speed.

From my experience when you start getting into higher compression ratio domes, cylinder porting, bigger carbs, stroker kits, different size tires and different exhaust systems then you're going to benefit the most from clutch mods. Whatever you decide to do be sure and post your results.

 

What would be a good spring to go with? White, pink? Red?

 

I don't really like to suggest parts that I haven't tested with on a quad, but if it were my money and my quad I would try an EPI gold (part# PATV9) or EPI red (part# PATV1) first and then maybe an EPI bright green (part# PATV7) if I wasn't seeing the results that I expected with the other two primary springs.