2007-2009 Honda TRX300EX TRX300X service manual, Page 210Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Apply molybdenum oil solution to the inner surfaces and guide pins of the shift forksInstall the shift forks into gear shifter grooves with each identification mark facing up (right crankcase side)Apply engine oil to the shift drum guide grooves and install shift drum into the left crankcase
Apply engine oil to the shift fork shaftInstall the shift fork shaft through the shift forks and into the left crankcase