Benelli 2014 BN600, Service Manual

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ENG
VALVE CHECK
Replace the valves one at a time, taking care not to mix the
parts. Each valve needs to be inserted into its own seat, as mar-
ked before it was removed.
NOTE
The seat (A) on the valve head cannot be ground; if necessary,
replace the valve
It is possible to apply some abrasive paste, although it is prohibi-
ted to grind a valve at the end of the valve stem.
Remove the combustion residues from the valves.
Check the seat (A) on the valve head with a straight edge rule
Fig. A
The seat surface must not be concave;
if necessary, replace the valve .
Check the clearance between the stem and valve
guide:
Valve Stem - guide clearance
Inlet 0.05 ~ 0.075 mm
Discharge 0.04 ~ 0.065 mm
NOTE
In case of sizes not listed in the table, replace the valve guide.
Check the eccentricity of the valve stem Fig.B, using the table
below.
If outside specifi cations, replace the valve.
Valve Eccentricity
Inlet
0.1 mm
Discharge
NOTE
If installing a new valve, always replace the relevant guide
If the valve is removed or refi tted, always replace the oil seal.
HEAD TIMING GEAR
A
A
B