1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 65Get this manual
COOLING SYSTEM
OIL COOLEROIL HOSES
INSPECTION
Remove the front fender (page 16-1)Inspect the oil cooler soldered joints and seams for leaksBlow dirt out of core fins with compressed airIf insects, etc are clogging the oil coolerremove them with low pressure waterCarefully straighten any bent fins
REMOVAL
Drain the engine oil (page 2-2)Remove the oil hoses from the oil cooler by removing the mounting bolts
Remove the oil cooler, oil hose guard, clamp and set piece Disconnect the oil hoses from the crankcase cover