Cylinder Head And Valves; Valve Seat Inspection - Royal Enfield Bullet Classic EFI Service Manual

Remove the piston rings carefully. For
cleaning the groove in the piston, a piece
of broken piston ring thrust into a wooden
handle and filed to a chisel point can be
used.

CYLINDER HEAD AND VALVES

VALVE SEAT INSPECTION

Clean both Inlet & Exhaust valves and
thoroughly remove the carbon deposits
Apply light coating of Prussian blue to the
valve seats.
NOTE :
Ensure proper valve seat contact by
taping the valve in the valve seat
without rotating.
Remove the valve and inspect the width of
each seat.
The seat contact should be within the
specified width and even all around the
circumference
Standard : 0.9 - 1.1 mm
Service Limit : 1.5 mm
Valve seat width is not within specification,
reface the valve seat.
CAUTION :
If a valve face is burnt or badly worn or if it
contacts the seat unevenly, replace the valve.
Inspect the valve seat face for :
Damage face :
Replace the valve and reface the valve
seat.
Uneven seat width :
Bent or collapsed valve stem.
Replace the valve and reface the valve
seat.
Contact area is too high or too low. Reface
the valve seat.
03-21