1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 119Get this manual
RECOIL STAR ERALTERNATOR CAM CHAIN TENSIONER STARTER DL ER GEAR
Check the starter idler gear and shah for wear or damage,LEFT CRANKC COVEA SPACER
Check the starter reduction gears, shaft and shaft bores in the left crankcase cover and spacer for wear or damage