1986-1988 Honda TRX 200SX Fourtrax Service Manual, Page 64Get this manual
CYLINDER HEADV Al VES Apply thin coating of Prussian Blue to the valve seatPress the valve through the valve guide and onto the seat to make lear pattern NOTE The location of the valve seat in relation to the va lve face very imponant for good sealingIS
(11 CONTACT TOO HIGH
(21 OLD SEAT WIDTH
If the contact area is too high on the valvethe seat must lowered using 32 degree flat cutter
If the contact area is too low on the valvethe seat must raised using 60 degree inner cutter
( 11 CONT ACT TOO LOW
,(2) OLD SEAT IDTH
Refinish the seal to speCificat ionsuSing 45 degree finish cutlerAher cutting the seat, apply lapping com pound to the valv"! face, and lap the valve using light pressure After lapping, wash all res idual compound off the yl inder head and va lve NOTE Do not allow lapping compound to enter the gUides