1985-1987 Honda TRX 250 Fourtrax 250 Service Manual, Page 132Get this manual
CRANKCASECRANKSHAFTTRANSMISSION Clean the output gear case in solvent and blow open the oil passage with compressed eir
OUTPUT DRIVE GEAR ASSEMBLY
Place the shim and output drive gear into the caseNOTE
(1) OUTPUT DRIVE GEAR
When the gear set, driven gear bearing holder, driven gear bearing andor gear case has been replaced, use shim of 1.00 mm (0 .039 inl thickness for initial reference