1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 43Get this manual
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MAINTENANCE
Inspect the condition of the a-rings and replace any that are worn or damagedInstall the valve adjusting hole coversInstall the following:crankshaft hole cap (TRX300)reduction shaft