Cylinder And Piston - Panterra Fusion Service Manual

NIKOTA USA: PANTERRA SCOOTER SERVICE MANUAL

8. Cylinder and Piston

Topic
Material
Troubleshooting
Removing the cylinder
Checking the Cylinder
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.
Item
Cylinder
ID
Distortion
Cylindricity
Out-of-roundness
Piston
Clearance between
the ring and the ring groove
Compressed gap
Piston ring
OD of piston
Check point of OD
Clearance between piston and cylinder
ID of the piston pin hole
OD of the piston pin
Clearance between the piston pin and the hole
ID of the small end of the connecting rod
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.
CHAPTER 8: CYLINDER AND PISTON
Page Topic
8-2 Removing the piston
8-2 Assembling the piston
8-3 Assembling the cylinder
8-5
Normal size
(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
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.
8-2
Page
8-3
8-7
8-8
unit: mm
Max. Service
Allowance
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
89