Valve Clearance - Suzuki GW250 Service Manual

2-8 PERIODIC MAINTENANCE

VALVE CLEARANCE

Inspect initially at 1 000 km (600 miles, 3 months) and
every 5 000 km (3 000 miles, 15 months) thereafter.
• Remove the fuel tank covers. (8-5)
• Remove the spark plugs 1. (2-6)
• Remove the cylinder head caps 2 and reservoir tank mount-
ing bolts 3.
• Disconnect the PAIR hose 4 and remove the cylinder head
cover 5. (3-12)
The valve clearance specification is different for intake and
exhaust valves. Valve clearance must be checked and adjusted,
1) at the time of periodic inspection, 2) when the valve mecha-
nism is serviced, and 3) when the camshafts are removed for
servicing.
 Valve clearance (when cold):
Standard: IN. : 0.05 – 0.10 mm (0.002 – 0.004 in)
EX.: 0.17 – 0.22 mm (0.007 – 0.009 in)
NOTE:
* The valve clearance should be taken when each cylinder is at
Top Dead Center (TDC) of compression stroke.
* The clearance specification is for COLD state.
* To turn the crankshaft for valve clearance checking, be sure to
use a wrench, and rotate in the normal running direction.