Cam Chain Tension Adjuster; Cylinder; Piston And Piston Pin - Suzuki GZ250 Service Manual

CAM CHAIN TENSION ADJUSTER

The cam chain tension adjuster is maintained at the proper
tension by an automatically adjusted tensioner. Insert a flat-
head screwdriver into the slotted end of the cam chain ten-
sion adjuster and turn it clockwise to release the tension.
Remove the screwdriver to make sure that the push rod
moves properly. If the push rod is stuck or the spring mech-
anism does not work, replace the cam chain tension adjust-
er assembly with a new one.

CYLINDER

DISTORTION
Check the gasket surface of the cylinder for distortion using
a straightedge and thickness gauge. Take clearance read-
ings at several places. If any reading exceeds the service
limit, replace the cylinder.
09900-20803: Thickness
gauge Service Limit: 0.05 mm (0.002
in)
CYLINDER BORE
Measure the cylinder bore diameter at six places. If any
one of the measurements exceed the limit, overhaul the
cylinder and replace the piston with an oversize piston, or
09900-20508: Cylinder gauge set
Service Limit: 72.085 mm (2.8380 in)
replace the cylinder.

PISTON AND PISTON PIN

DIAMETER
Measure the piston diameter using the micrometer at 15
mm (0.6 in) from the skirt end.
If the piston diameter is less than the service limit, replace
the piston.
09900-20203: Micrometer (50-75 mm)
Service Limit: 71.880 mm (2.8299
in) Piston oversize: 0.5, 1.0 mm
PISTON-CYLINDER CLEARANCE
Subtract the piston diameter from the cylinder bore diame-
ter. If the piston-to-cylinder clearance exceeds the service
limit, rebore the cylinder and use an oversize piston or re-
place both the cylinder and the piston.
Service Limit: 0.120 mm (0.0047 in)
ENGINE 3-34