Honda CH250 Elite 1986 User Manual

7. CYLINDER/PISTON
SERVICE INFORMATION
TROUBLESHOOTING
CYLINDER REMOVAL
SERVICE INFORMATION
GENERAL
PISTON REMOVAL
PISTON INSTALLATION
CYLINDER INSTALLATION
7-3
7-6
7-7
• The cyliindl~r and piston can be serviced with the engine in the frame.
SPECIFICATIONS
ITEM
STANDARD
mm (inl SERVICE LIMIT mm (in)
1.0.
72.000- 72.01 0 12.8346- 2.8350) 72.10(2.839)
v
0.05 (0.002)
Piston,
0:
Top
0.015--0.050 (0.0006-0.00201 0.09 (0.004)
."
".
Piston
ISecond
..
0.015-0.050 (0.0006-0.0020)
0.09 10.004)
..
gap Top
10.15-0.35 (0.006·-0.014) 0.50 (0.020)
Second 0.15-0.35 (0.006-0.0141 0.50 (0.020)
Oil (Side raill 0.2-0.7 (0.01--0.03)
--
Piston 0.0.
I? Q~~l:! .? Q~.lI?1
71.90 (2.831)
.--
Piston-ta-cylinder
I A.A AliA 'A AAAil .A riA 6)
0.10 (0.004)
Piston pin bore
'.002
'.008 1r1 "",,,.... f'\ &:&:Q&ll
17.04 (0.671)
--
Piston pin 0.0.
16.994-17.000 (0.6691 -0.6693) 16.96 (0.668)
f'>'
pil clearance
0.002-0.014 (0.0001-0.0006) 0.02 (0.001)
.
~
." rod small end 1.0.
17.016 17.034 (0.6699 0.6706)
17.06 (0.6721
TROUBLESHOOTI NG
low compression or uneven compression
• Worn cylinder or rings
Excessive smoke
• Worn piston or piston rings
ImllYOlperly installed piston
Dalns!Jed piston or cvliind':lr
Overheating
• Excessive carbon on piston head
Blocke,d
or restricted flow of coolant
Stj(~kirlg thermostat
Kl1lCtck:ing or abnormal noise
• Worn and cyliindl:lf
• Excessive carbon on piston head
7-1

Honda CH250 Elite 1986 Specifications

General

Engine Type	Single-cylinder, four-stroke
Displacement	244 cc
Bore x Stroke	72.0 mm x 60.0 mm
Compression Ratio	10.0:1
Fuel System	Carburetor
Ignition	CDI
Starting System	Electric
Transmission	Automatic
Final Drive	V-Belt
Front Suspension	Telescopic fork
Rear Brake	Drum
Front Tire	3.50-10
Seat Height	760 mm
Cooling System	Liquid-cooled