1999-2004 Suzuki King Quad LT-300 300F ATV Factory Service Manual, Page 84Get this manual
GEARSHIFT FORK AND GEAR
GEARSHIFT-FORK-TO-GEARSHIFT-FORK GROOVE CLEARANCE Measure the gearshift fork clearance in the groove of its respective gear using the thickness gaugeIf the clearance exceeds the specification, replace the fork, its respective gear, or bothThe clearance for each of the six gearshift forks plays an important role in the smoothness and positiveness of the shifting action
'MOt, 09900-20803: Thickness gauge
09900-20102: Vernier calipers Standard Gearshift fork-groove clearance: Transmission (No.1, No.2 and No.3): 0.10-0.30 mm (0.004-0.012 in) Sub-transmission (No.1 and No.2): 0.05-0.25 mm (0.002-0.010 in) 0.10-0.30 mm (0.004-0.012 in) Reverse: Service Limit: 0.50 mm (0.020 in)