1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 162Get this manual
CRANKCASECRANKSHAFTTRANSMISSION GEAR TOOTH CONTACT PATTERN CHECK Remove the output shaft assembly and apply Prussian Blue to the output shaft gear teethInstall the output shaft assembly and rotate the countershaft several times in both directions of rotationRemove the output shaft assembly again, and check the gear tooth contact pattern
Contact is normal if Prussian Blue is transfered to the approximate center of each tooth and slightly to the side
(3) FACE (4) FLANK
(6) TOE (7) COAST SIDE
(5) DRIVE SIDE
If the pattern is not correct, remove and replace the countershaft adjustment shim (page 10-21)Replace the shim with thinner one if the contact pattern is too high