Yoshi Pro Series

[400exrider989]

my buddy just bought a yoshi pro series slip on for his kfx
its an 06 brand new, this is the only upgrade.
i was wondering what new jets he should run?
hes at 4000ft and running at 20 degrees celcius

thanks for help

[JAYKNIGHT]

if it just a slip-on he wont need to jet it at all if he removes the airbox lid then he will

[suzukiray]

At the LEAST pull the carb & drill & remove the plug blocking the mixture screw & adjust the mixture screw! Ray.