Suzuki AN400 Service Manual page 23

2-6 PERIODIC MAINTENANCE
• The valve clearance specification is different for 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 camshaft is
disturbed by removing it for servicing.
$ Valve clearance (When cold):
Standard: IN.: 0.08 – 0.13 mm (0.003 – 0.005 in)
EX.: 0.17 – 0.22 mm (0.007 – 0.009 in)
NOTE:
* The piston must be at (TDC) on the compression stroke in
order to check the valve clearance or to adjust valve clear-
ance.
* The clearance specification is for COLD state.
* To turn the crankshaft for clearance checking, and rotate in
the normal running direction. The spark plug should be
removed.
• Turn crankshaft to bring the "TDC" line A on the rotor to the
index mark B on the generator stator case.
• Check that the engrave line C locates parallel with the mating
face between the cylinder head cover when viewed from the
side.
• Insert a thickness gauge between the valve stem end and the
adjusting screw on the rocker arm.
• If the clearance is out of specification, bring it into the speci-
fied range.
% 09900-20806: Thickness gauge
09917-14920: Valve clearance adjusting driver
Lock nut
Rocker arm
Valve stem
Tappet screw
Thickness gauge