2-4 PERIODIC MAINTENANCE
MAINTENANCE AND TUNE-UP
PROCEDURES
This section describes the servicing procedures for each item in
the Periodic Maintenance Chart.
VALVE CLEARANCE
• Remove the fuel tank. (!4-3)
• Remove the frame head covers. (GSF650 !5-5)
• Remove the cowling. (GSF650S !5-5)
• Remove the PAIR valve. (!3-97)
• Remove all the spark plugs.
• Remove the cylinder head cover and signal generator cover.
(!3-12 and -13)
The valve clearance specification is different for both intake and
exhaust valves.
Valve clearance adjustment must be checked and adjusted 1) at
the time of periodic inspection, 2) when the valve mechanism is
serviced, and 3) when the camshafts are removed for servicing.
" Valve clearance (when cold):
IN.: 0.10 – 0.15 mm
EX.: 0.18 – 0.23 mm
NOTE:
* The camshafts must be at positions
A or
B, in order to check
or adjust the valve clearance. Clearance readings should not
be taken with the camshafts in any other position than the
ones shown.
* The valve clearance should only be checked when the engine
is cold.
* Turn the crankshaft clockwise using a 19-mm wrench. Make
sure that all of the spark plugs have been removed.
• Turn the crankshaft clockwise and align the “T” mark on the
signal generator rotor with the center of the pickup coil. Also,
position the notches
1 on the right end of each camshaft as
shown. Then, measure the following valve clearance
C:
Cylinder #1: Intake and exhaust valve clearance
Cylinder #2: Exhaust valve clearance
Cylinder #3: Intake valve clearance
Inspect initially at 1 000 km (1 month) and every 12 000
km (24 months).
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