8. Cylinder and Piston
8-2
89
NIKOTA USA: PANTERRA SCOOTER SERVICE MANUAL
CHAPTER 8: CYLINDER AND PISTON
Topic Page
Material 8-2
Troubleshooting 8-2
Removing the cylinder 8-3
Checking the Cylinder 8-5
Topic Page
Removing the piston 8-3
Assembling the piston 8-7
Assembling the cylinder 8-8
Important Points
•The work on the cylinder and piston can be done on the engine without complete disassembly.
•After taking them apart, clean and dry the cylinder and piston with the compressed air before measuring and testing.
Troubleshooting
•In case of difficulty starting or unsteady running at
low speeds, check if there is white smoke coming
out of the air hole pipe of the crankcase. If that is
the case, the piston ring is worn, burnt or broken.
Low Compression Pressure
•The piston ring is worn, burnt or broken.
•The piston/cylinder is worn or damaged.
Compression Pressure is Too High
•Carbon deposits on the piston and the combustion
chamber.
White Smoke Coming Out of the Exhaust Pipe
•The piston ring is worn or damaged.
•The piston/cylinder is worn or damaged.
Knocking Noise by the Piston
•The cylinder, the piston or the piston ring is worn.
•The piston pin and its hole are worn.
Item
(0.04) 0.05
0.015-0.055
0.015-0.055
0.08-0.20
0.05-0.20
0.20-0.70
38.980-38.780
9mm away from skirt
0.010-0.040
13.002-13.008
12.994-13.000
0.002-0.014
13.016-13.034
39.10
0.05
0.05
0.05
0.09
0.09
0.45
0.45
38.7
0.1
13.04
12.96
0.02
13.06
Cylinder
Piston
Piston ring
OD of the piston pin
Clearance between the piston pin and the hole
ID of the small end of the connecting rod
ID
Distortion
Cylindricity
Out-of-roundness
Clearance between
the ring and the ring groove
OD of piston
Check point of OD
Clearance between piston and cylinder
ID of the piston pin hole
Compressed gap
Normal size Max. Service
Allowance
unit: mm
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