Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 141Get this manual
CARBURETION Component Effect vs Throttle Opening
DECREASING
INCREASING
THROTTLE OPENINGTYPICAL MIKUNI
Throttle Valve Cut-Away Jet NeedleNeedle Jet Polaris TM-38TM-40 Mikuni component effect versus throttle opening chart