Cylinder/Piston - Honda Hawk GT NT650 1988 Service Manual

10. CYLINDER/PISTON
SERVICE INFORMATION
TROUBLESHOOTING
CYLINDER
PISTON
SERVICE INFORMATION
GENERAL
10-1
10-1
10-2
10-3
PISTON RING INSTALLATION
PISTON INSTALLATION
CYLINDER INSTALLATION
10-5
10-5
10-6
• This section covers service of the cylinder and piston.
• The engine must be removed to service to cylinder/piston.
• To service the crankcase stud bolts. refer to page
11-13.
SPECIFICATIONS
Unit: mm (in)
ITEM STANDARD SERVICE LIMIT
Cylinder
1.0.
79.000- 79.015 (3.1102-3.1108) 79.05 (3.112)
Warpage across top
- -
0.10 (0.004)
Taper
- -
0.06 (0.002)
Out-of-round
- -
0.06 (0.002)
Piston, Piston ring-to-ring
TOP
0.025-0.055 (0.001-0.002) 0.11 (0.004)
piston groove clearance
SECOND
0.015-0.045 (0.0006-0.0018) 0.10 (0.004)
rings
and piston
Ring end gap TOP 0.20-0.35 (0.008-0.014)
0.65 (0.026)
pin
SECOND
0.35-0.50 (0.014-0.020) 0.65 (0.026)
OIL 0.20-0.80 (0.008-0.031)
0.95 (0.037)
Piston 0.0.
78.970- 78.990 (3.1086-3.1098) 78.92 (3.107)
Piston pin bore
20.002-20.008 (0.7874-0.7877) 20.018 (0.7881)
Connecting rod small end 1.0. 20.016-20.034 (0.7880-0.7887) 20.04 (0.789)
Piston pin 0.0. 19.994-20.000 (0.7871-0.7874) 19.984 (0.7867)
Piston-to-piston pin clearance
0.002-0.014 (0.0001-0.0006) 0.034 (0.0013)
Cylinder-to-piston clearance 0.010-0.035 (0.0004-0.0014) 0.13 10.005)
Piston pin-to-connecting rod
0.016-0.040 (0.0006-0.0016) 0.060 10.0024)
small end clearance
TROUBLESHOOTI NG
m
Low or uneven compression
Worn cylinder or piston rings.
Leaking head gasket.
Incorrect valve timing.
Excessive smoke
Worn cylinder and piston rings.
Improperly installed piston rings.
Damaged piston or cylinder.
Overheating
Excessive carbon deposits on piston or combustion
chamber.
Faulty water pump.
Piston noise
• Worn cylinder and piston.
• Excessive carbon deposits.
10-1