2007-2009 Honda TRX300EX TRX300X service manual, Page 165Get this manual
CLUTCH Temporarily install the clutch outer guide and clutch outerInstall the special tool between the primary drive and driven gears as shown
TOOL: Gear holder, 2.S
077240010100 or 07724-001 100 (U.S.Aonly)
The lock nut have left-hand threads
Tighten the primary drive gear lock nut using the specia tool
TOOL: Lock nut wrench, 17 x27 mm Extension bar
07716-0020300 or equivalent commercially available in U.S.A07716-0020500 or equivalent commercially available in U.S.A