Suzuki TU250X Service Manual page 24

2-6 PERIODIC MAINTENANCE
INSPECTION
The valve clearance specification is same for both valves. Valve
clearance adjustment must be checked and adjusted, 1) at the
time of periodic inspection, 2) when the valve mechanism is ser-
viced, and 3) when the camshaft is disturbed by removing it for
servicing.
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, rotate in the nor-
mal running direction. The spark plug should be removed.
• Rotate the crankshaft and align the line A on the generator
rotor with the mark B on the generator cover.
• 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.
 Valve clearance (when cold):
IN.: 0.03 – 0.08 mm (0.001 – 0.003 in)
EX.: 0.08 – 0.13 mm (0.003 – 0.005 in)
 Valve clearance adjusting screw lock-nut:
 09900-20803: Thickness gauge
09917-14910: Tappet adjust driver
• After finishing the valve clearance adjustment, reinstall the fol-
lowing items.
* Throttle cables (5-17)
* TDC plug and generator cover plug (3-73)
* Valve inspection caps (3-74)
* Spark plug and plug cap (2-7)
* Fuel tank (5-3)
* Front seat
15 N·m (1.5 kgf-m, 11.0 lbf-ft)
Lock-nut
Rocker arm
Valve stem
Adjusting screw