DAELIM B-Bone Service Manual page 150

CYLINDER HEAD / VALVES
CONTACT TOO HIGH
CONTACT TOO LOW
10-10
55
SEAT WIDTH
45
37
55
● Using a 55 degree cutter, remove the bottom ¼ of the
old seat.
● Using a 45 degree cutter, cut the seat to the proper
width.
● If the contact area is too high on the valve, the seat
must be lowered using a 37 degree flat cutter.
Refinish the seat to specifications, using a 45 degree
finish cutter.
● If the contact area is too low on the valve, the seat must
be raised using a 55 degree inner cutter.
Refinish the seat to specifications, using a 45 degree
finish cutter.