Suzuki UF50, Service Manual, Page: 43 / 185

3-14 ENGINE
PISTON
PISTON DIAMETER
Measure the piston diameter using a micrometer at 15 mm from
the skirt end.
If the piston diameter is less than the service limit, replace the
piston with a new one.
09900-20202: Micrometer (25 – 50 mm)
Piston diameter
Service Limit: 40.885 mm
PISTON-TO-CYLINDER CLEARANCE
Subtract the piston diameter from the cylinder bore diameter. If
the piston-to-cylinder clearance exceeds the service limit, rebore
the cylinder and use an oversized piston or replace both the
cylinder and the piston with new ones.
Piston-to-cylinder clearance
Service Limit: 0.120 mm
CARBON REMOVAL
Remove carbon from the crown of the piston and piston ring
grooves. After cleaning the piston ring grooves, install the piston
rings and rotate them in their respective grooves to be sure that
they move smoothly.
Carbon in the piston ring groove can cause the piston ring to get
stuck, reducing engine power output.
If any scuffing is found, replace the piston with a new one.
Shallow grooves or minor scuffs can be removed by using em-
ery paper (about #400 grit) as shown.