Suzuki EN125-2A, Service Manual

Page: 52 / 208

ENGINE 3-20
PISTON DIAMETER
Using a micrometer, measure the piston outside
diameter at the place 10 mm from the skirt end as
shown in Fig. If the measurement is less than the
limit, replace the piston.
Piston ring-groove clearance
Micrometer
(50 75 mm)
09900-20203
Service limit 56.880 mm
NOTE:
Using a soft-metal scraper, decarbon the
crown of the piston. Clean the ring grooves
similarly.
PISTON-CYLINDER CLEARANCE
As a result of the above measurement, if the
piston to cylinder clearance exceeds the limit
shown in the table below, rep ace both the cylinder
a d piston.
l
n
Service limit 0.120 mm
PISTON RING-GROOVE CLEARANCE
Using a thickness gauge, measure the side
clearance of the 1st and 2nd rings. If any of the
clearances exceeds the limit, replace both piston
and piston rings.
Thickness gauge
09900-20830
Piston ring
Service limit
1st 0.180 mm
2nd 0.150 mm