Daelim B-Bone 125cc service manual.pdf - Mojo

11. CYLINDER / PISTON
SERVICE INFORMATION··· 11-1
TROUBLESHOOTING···· 11-1
CYLINDER········· 11-2
SERVICE INFORMATION
CYLINDER / PISTON
PISTON / PISTON RING ··11-3
CYLINDER INSTALLATION · 11-6
GENERAL SAFETY
● 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 fins.
● 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.
SPECIFICATIONS
CYLINDER
PISTON,
PISTON PIN,
PISTON RING
Unit : mm
ITEM STANDARD VALUE SERVICE LIMIT
INNER DIAMETER
TAPER
OUT-OF-ROUND
HEAD CONTACT WARPAGE
PISTON SKIRT OUTER DIAMETER
PISTON PIN HOLE INNER DIAMETER
PISTON PIN OUTER DIAMETER
PISTON-TO-PISTON PIN CLEARANCE
PISTON RING-TO-
GROOVE CLEARANCE
PISTON RING
JOINT GAP
TOP
SECOND
TOP / SECOND
OIL RING (SIDE RAIL)
CYLINDER-TO-PISTON CLEARANCE
CONNECTING ROD SMALL END INNER DIAMETER
GAP BETWEEN CONNECTING ROD SMALL END AND PISTON PIN
56.000 - 56.010 mm
-
-
-
55.925 - 55.945 mm
15.002 - 15.008 mm
14.994 - 15.000 mm
0.002 - 0.014 mm
0.040 - 0.067 mm
0.025 - 0.052 mm
0.10 - 0.25 mm
0.20 - 0.70 mm
0.055 - 0.090 mm
15.010 - 15.028 mm
0.010 - 0.034 mm
56.100 mm
0.050 mm
0.005 mm
0.020 mm
55.825 mm
15.040 mm
14.960 mm
0.020 mm
0.110 mm
0.080 mm
0.50 mm
1.10 mm
0.200 mm
15.060 mm
0.040 mm
11
TROUBLESHOOTING
Comperssion too low
● Worn piston
● Worn, damaged piston ring
● Worn cylinder
Excessive smoke
● Worn cylinder, piston or piston rings
● Improper installation of piston ring
● Scored or scratched piston or cylinder wall
Overheating
● Excessive carbon build-up on top of piston
Abnormal noise
● Worn cylinder and piston
● Worn connecting rod small end bearing or piston pin
● Damaged piston ring
● Excessive carbon build-up on top of piston
11-1