CFMOTO
05-98
Valve stem diameter
Exhaust valve
New
4.955 mm~4.970 mm
(0.195 1in~0.1957 in)
Service limit 4.930 mm (0.1941in)
Intake valve
New
4.965mm~4.980mm
(0.1955in~0.1960in)
Service limit 4.930mm (0.1941in)
Valve Bevel and Valve Seat
Inspect valve bevel
2
and valve seat
1
for being burnt or sunk. Replace valves or
cylinder head if necessary.
Apply some grinding agent on valve bevel.
Grind valve with grinding tool (refer to the
following valve guide section).
NOTE: Make sure valve seats are
qualified. Apply some identification
agent to inspect valve contacting area
condition.
Grind the valve until the sealing between
valve and seat is qualied.
NOTE: The remained grinding agent
has to be cleaned.
Measure valve bevel width
1
and
contacting width
2
.
NOTE: The contacting area should be
at the center of valve seat.
Measure spring seat width.
Spring seat contacting width
Exhaust valve
New
1.20 mm~1.40 mm
(0.047 in~0.055 in)
Service limit 1.80mm (0.071 in)
Intake valve
New
1.10 mm~1.30 mm
(0.043 in~0.051 in)
Service limit 1.70 mm(0.067 in)
If the valve seat contacting width is beyond
service limit or has dark spots, replace
cylinder head.
1 2
055401
© CFMOTO Powersports, Inc. This manual is subject to all applicable copyright laws.
Reproduction or duplication in any form, whole or in part, is strictly prohbited.
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