Spark Plug; Adjustment - Suzuki GZ250 Service Manual

ADJUSTMENT

The clearance is adjusted using the special tool and offset
wrench.
• Loosen the locknuts
• Insert a thickness gauge between the valve stem end
and the adjusting screw
• Adjust the valve clearance by turning the adjusting screw
using the special tool while holding the locknuts
09917-14920: Valve adjuster wrench
CAUTION
Both the right and left valve clearances should be as
closely as possible.
• After the adjustment is completed, tighten the locknut se-
curely.
• Rotate the crankshaft 720° with a box wrench and check
that the clearance is within specification.

SPARK PLUG

Inspect every 5 000 km (3 000 miles, 15 months).
Replace every 10 000 km (6 000 miles, 30 months).
Neglecting the spark plug eventually leads to difficult start-
ing and poor engine performance. If the spark plug is used
for a long period, the electrode gradually bums away and
carbon builds up along the inside part of the spark plug. In
accordance with the Periodic Maintenance chart, the spark
plug should be inspected, cleaned and regapped at the rec-
ommended intervals.
• Remove the cylinder head cover left cap.
• Disconnect the spark plug cap and remove the spark
plug.
09930-10121: Spark plug socket wrench set
• Carbon deposits on the spark plug will prevent
good
sparking and may cause the engine to misfire. Be sure to
clean the carbon deposits off periodically.
If the center electrode is fairly worn down, the spark plug
should be replaced and the spark plug gap set to the speci-
fication using a thickness gauge.
09900-20803: Thickness gauge
Spark plug gap: 0.6-0.7 mm (0.024-0.028 in)
on the rocker arm.
PERIODIC MAINTENA NCE 2-6