1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 147Get this manual
CRANKCASECRANKSHAFTTRANSMISSION NOTE
The shih fork marks are marked: for left, for center and for rightInstall the shih forks with their marks facing up
Install the shift drum and align each shift fork guide pin with the guide groove in the drumInsert the shift fork shah through the shift forks into the hole in the left crankcase with the threaded I.D toward the right side Aher installation, apply oil mainshaft and countershah, and check each gear for smooth rotation