Valve Clearance - Suzuki RM-z450 Owner's Service Manual

2-20 PERIODIC MAINTENANCE

VALVE CLEARANCE

• Remove the seat. (!5-2)
• Remove the radiator covers and fuel tank. (!5-2)
• Disconnect the spark plug cap. (!2-7)
• Remove the spark plug. (!2-7)
• Remove the TO sensor bracket bolt and nut.
• Remove the cylinder head cover 1 and its gasket.
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 maintenance, 2) when the valve mecha-
nism is serviced, and 3) when the camshafts are removed for
servicing.
NOTE:
* The piston must be at top dead center (TDC) on the compres-
sion stroke in order to check or adjust the valve clearance.
* The valve clearance should only be checked when the engine
is cold.
• Drain engine oil. (!2-11)
• Remove the TDC plug 2 and crankshaft hole plug 3.
• Place a wrench over the crankshaft and turn it counter-clock-
wise to align the TDC mark A with the center of the groove B
of the timing inspection hole.
NOTE:
The piston must be at TDC on the compression stroke. (!6-3)
• Insert a thickness gauge between the tappet and the cam. If
the clearance is out of specification, adjust it to specification
as follows.
" 09900-20803: Thickness gauge
# Valve clearance (when cold):
Standard: IN. : 0.09 – 0.16 mm (0.004 – 0.006 in)
EX. : 0.17 – 0.24 mm (0.007 – 0.009 in)