KYMCO PEOPLE 250 Service Manual

7. CYLINDER/PISTON
7-2
PEOPL E 25 0
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• The cylinder and piston can be serviced with the engine installed in the frame.
• When installing the cylinder, use a new cylinder gasket and make sure that the dowel pins are
correctly installed.
• After disassembly, clean the removed parts and dry them with compressed air before inspection.
SPECIFICATIONS
Standard (mm)
Service Limit (mm)
Item
BC50AA
SH25CA
BC50AA
SH25CA
I.D.
72.705_ 72.715
72.80
52.50
Warpage
0.01
0.01
0.05
0.05
Cylindricity
0.01
0.01
0.05
0.05
True roundness
0.01
0.01
0.05
0.05
Ring-to-groove
top
0.02
0.09
0.09
clearance
Second
0.015_ 0.050
0.015_ 0.050
0.09
0.09
top
0.1_ 0.25
0.15_ 0.30
0.50
0.50
Piston,
Ring end gap
Second
0.15_ 0.30
0.15_ 0.30
0.50
0.50
piston ring
Oil side rail
0.25_ 0.7
0.2_ 0.9
æ
æ
Piston O.D.
72.67_ 72.69
52.370_ 52.390
72.6
52.30
Piston O.D. measuring position
9mm from bottom of skirt
9mm from bottom of skirt
.
Piston-to-cylinder clearance
0.010_ 0.040
0.010_ 0.040
0.04
0.01
Piston pin hole I.D.
17.002_ 17.008
15.002_ 15.008
17.04
15.04
Piston pin O.D
16.994_ 17.000
14.994_ 15.000
16.96
14.96
Piston-to-piston pin clearance
0.002_ 0.014
0.002_ 0.014
0.02
0.02
Connecting rod small end I.D. bore
17.016_ 17.034
15.016_ 15.034
17.06
15.06
TROUBLESHOOTING
• When hard starting or poor performance at low speed occurs, check the crankcase breather for
white smoke. If white smoke is found, it means that the piston rings are worn, stuck or broken.
Compression too low or uneven
compression Excessive smoke from exhaust muffler
• Worn or damaged cylinder and piston rings • Worn or damaged piston rings
• Worn, stuck or broken piston rings • Worn or damaged cylinder and piston
Compression too high Abnormal noisy piston
• Excessive carbon build-up in combustion • Worn cylinder, piston and piston rings
chamber or on piston head • Worn piston pin hole and piston pin
• Incorrectly installed piston
Cylinder

KYMCO PEOPLE 250 Specifications

General

Displacement	249 cc
Fuel System	Electronic Fuel Injection
Front Suspension	Telescopic fork
Front Brake	Disc
Rear Brake	Disc
Front Tire	110/70-16
Rear Tire	140/70-16
Transmission	CVT
Seat Height	800 mm
Width	780 mm