Valve Seat Refacing - Royal Enfield Bullet Classic EFI Service Manual

VALVE SEAT REFACING

Valve Seat cutters, a grinder or equivalent
valve seat refacing equipment are
recommended to correct worn valve seat.
If the contact area is too high on the valve,
the seat must be lowered using a 32 degree
flat cutter.
If the contact area is too low on the valve,
the seat must be raised using a 60 degree
inner cutter.
NOTE :
Reface the valve seat with a 45 degree cutter
when a valve guide is replaced.
Use a 45 degree cutter to remove the
roughness or irregularities from the seat.
Using 32 degree cutter, remove top 1/4 of
the existing valve seat material.
Using 60 degree cutter, remove the bottom
1/4 of the old seat.
Remove the cutter and inspect the area.
Install a 45 degree finish cutter and cut the
seat to proper width.
Make sure that all printing and irregularities
are removed. Refinish if necessary.
Standard seat width : 0.9 - 1.1 mm
03-22