1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 67Get this manual
CVLlNDER HEADIVALVES
Drain oil from the engine
Remove the tensioner sealing bolt, washer, tensioner
spring and push rod
TENS IONEA SEALI
Remove the timing mark hole cap
Turn the crankshaft with the recoil starter until the cam sprocket "0" mark and cylinder head index
mark align
Remove the can sprocket bolts and remove the cam shaft