DAELIM a.four User Manual

8-1
8. CYLINDER HEAD/CYLINDER/PISTON
SERVICE INFORMATION
GENERAL SAFETY
● Take precautions not to damage the joint part with a driver when removing the cylinder, or not to damage the cooling
pin by striking the cylinder too hard.
● Take precautions not to damage the inside of the cylinder or the exterior part of the piston.
● Check parts after disassembling, and clean and dry with an air hose prior to taking measurements.
SPECIFICATIONS
TROUBLESHOOTING
Comperssion low
● Worn cylinder or piston rings
● Leaking valve seats
Excessive smoke
● Worn cylinder or piston
● Improper installation of piston rings
● Scored or scratched piston or cylinder wall
Overheating
● Excessive carbon build-up on the piston combustion
● Incorrect spark plug
Knocking or abnormal noise
● Worn piston and cylinder
● Excessive carbon build-up
● Low octane fuel
8
SERVICES INFORMATION 8-1
TROUBLESHOOTING
8-1
FAN COVER, SHROUD REMOVAL
8-2
CYLINDER HEAD/ CYLINDER/ PISTON
8-3
ITEM
CYLINDER
PISTON,
PISTON PIN,
PISTON RING
CYLINDER TO PISTON CLEARANCE
STANDARD VALUE SERVICE LIMIT
Inner diameter 39.000-39.005mm 39.05mm
Cylindricality - 0.10mm
Out of roundness - 0.10mm
Piston skirt outer diameter 38.955-38.970mm 38.90mm
Piston pin hole inner diameter 12.002-12.008mm 12.03mm
Piston pin outer diameter 11.994-12.000mm 11.98mm
0.002-0.014mm 0.03mm
Unit : mm(in)

DAELIM a.four Specifications

General

Brand	DAELIM
Model	a.four
Category	Scooter
Language	English