2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 167Get this manual
ALTERNATORSTARTER CLUTCHCAM CHAIN TENSIONER Install the flywheel by aligning the key way in the flywheel with the woodruff key on the crankshaftThen turn the flywheel counterclockwise to install it fully
Apply engine oil to the flywheel nut threadInstall the washer and flywheel nut
Hold the flywheel using the flywheel holder, then tighten the nut to the specified torque