2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 87Get this manual
LUBRICATION SYSTEM 8e careful nor to damage the all cooler fins
Remove the two mounting bolts and the oil cooler out of the frame
INSTALLATION
Install the oil cooler onto the frame with the mounting bolts and tighten them securely
Take care not to pmch the O-rmg between the hose jomt and oil cooler