2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 102Get this manual
ENGINE REMOVALINSTALLATION
DRIVE SPROCKET INSTALLATION
Inslelilhe drive sprockeilo the drive chainInstall the drive chain guide pielaInslalilhe drive sprockello the countershaft
Install the drive sprocket setting plate onto the COlin
lersheft end align Ihtl boll holes on he plele with Ihe holes of th sprock et