7
. CYLINDER/PISTON
7-2
PEOPLE 250
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
Summary of Contents for People S 250
Page 21: ...1 GENERAL INFORMATION 1 18 PEOPLE 250 WIRING DIAGRAM ...
Page 34: ...2 EXHAUST MUFFLER FRAME COVERS 2 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 71: ...6 CYLINDER HEAD VALVES 6 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 83: ...7 CYLINDER PISTON 7 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 92: ...8 DRIVE AND DRIVEN PULLEYS V BELT 8 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 106: ...8 DRIVE AND DRIVEN PULLEYS V BELT 8 15 PEOPLE 250 Install the left crankcase cover 8 3 ...
Page 108: ...9 FINAL REDUCTION 9 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 117: ...10 A C GENERATOR STARTER CLUTCH 10 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 127: ...11 CRANKCASE CRANKSHAFT 11 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 134: ...12 COOLING SYSTEM 12 1 PEOPLE 250 SCHEMATIC DRAWING ...
Page 151: ...13 FUEL SYSTEM CARBURETOR FUEL PUMP FUEL TANK 13 1 PEOPLE 250 FUEL SYSTEM ...
Page 152: ...13 FUEL SYSTEM CARBURETOR FUEL PUMP FUEL TANK 13 2 PEOPLE 250 SCHEMATIC DRAWING ...
Page 191: ...15 REAR BRAKE REAR FORK REAR WHEEL REAR SHOCK ABSORBER 15 1 PEOPLE 250 SCHEMATIC DRAWING ...
