Specifications

ITEM
STANDARD VALUE
SERVICE LIMIT
INNER DIAMETER
TAPER
OUT-OF-ROUND
HEAD CONTACT WARPAGE
PISTON SKIRT OUTER DIAMETER
PISTON PIN HOLE INNER DIAMETER
PISTON PINOUTER DIAMETER
PISTON TO PISTON PIN CLEARANCE
CYLINDER TO PISTON CLEARANCE
CONNECTING ROD SMALL END INNER DIAMETER
GAP BETWEEN CONNECTING ROD SMALL END AND PISTON PIN
PISTON RING TO
GROOVE CLEARANCE
PISTON RING
JOINT GAP
TOP
SECOND
39.000-39.010mm
-
-
-
38.970-38.980mm
13.008-13.012mm
12.994-13.000mm
0.008-0.018mm
0.05-0.15mm
0.05-0.17mm
0.020-0.040mm
13.013-13.028mm
0.013-0.034mm
39.04mm
0.05mm
0.05mm
0.05mm
38.92mm
13.04mm
12.98mm
0.04mm
0.04mm
0.04mm
0.08mm
13.05mm
0.06mm
OIL RING
0.1-0.6mm 0.8mm
10. CYLINDER / PISTON
SERVICE INFORMATION
···················
10-1
TROUBLESHOOTING
····················
10-1
CYLINDER
··························
10-2
PISTON
· ··························
10-3
PISTON / CYLINDER INSTALLATION
··············
10-5
Unit : mm
Compression pressure too low
● Piston worn
● Piston ring worn or damaged
● Cylinder worn
Emission of white gas from muffler
● Cylinder, piston, piston rings worn
● Bad adjustment of piston rings
● Piston, cylinder worn
TROUBLESHOOTING
Over heated
● Excessive carbon built up on top of piston
Abnormal engine noise
● Cylinder, piston worn
● Worn connecting rod small end bearing or piston pins
● Damaged piston rings
● Excessive carbon built up on top of piston
CYLINDER
PISTON,
PISTON
PIN,
PISTON
RING
● Be careful not to damage the mating surfaces by using a screwdriver when disassembling the cylinder. Do not strike
the cylinder too hard during disassembly, even with a rubber or plastic mallet, to prevent the possibility of damage to
the cylinder pins.
● Take care not to damage the cylinder wall and piston
● Check parts after disassembling, and clean and dry with an air hose prior to taking measurements.
SERVICE INFORMATION
GENERAL SAFETY
SPECIFICATIONS