Honda VT750C2 Shadow Spirit Service Manual page 200

CYUNDER/PISTON
SERVICE INFORMATION
GENERAL
• This section covers service of the piston and cylinder. To service these parts, the engine must be removed from the
frame.
• Take care not to damage the cylinder walls and pistons.
• Be careful not to damage the mating surfaces when removing the cylinder. Do not strike the cylinder too hard during
removal.
• When disassembling, mark and store the disassembled parts to ensure that they are reinstalled in their original loca­
tions.
• Clean all disassembled parts with cleaning solvent and dry them by blowing them off with compressed air before
inspection.
• Camshaft and rocker arm lubricating oil is fed through oil passages in the cylinder. Clean the oil passages before install­
ing the cylinder.
SPECIFICATIONS
Unit: mm (in)
ITEM STANDARD
SERVICE LIMIT
Cylinder 1.0.
79.000 - 79.015 (3.1102 - 3.1108)
79.10 (3.114)
Out-of-round
-
0.06 (0.002)
Taper
-
0.06 (0.002)
Warpage
-
0.10 (0.004)
Piston, piston
pin, piston
Piston 0.0. at 17 mm (0.7 in) from
the bottom
78.97 - 78.99 (3.109 - 3.110) 78.90 (3.106)
rings
Piston pin bore 1.0. 18.002 -18.008 (0.7087 - 0.7090) 18.05 (0.711)
Piston pin 0.0. 17.994 - 18.000 (0.7084 - 0.7087) 17.98 (0.708)
Piston-to-piston pin clearance 0.002 - 0.014 (0.0001 - 0.0006) 0.04 (0.002)
Piston ring end Top 0.15 - 0.25 (0.006 - 0.010)
0.4 (0.02)
gap
Second 0.25 - 0.40 (0.010 - 0.016) 0.6 (0.02)
Oil (side rail) 0.20 - 0.80 (0.008 - 0.031) 1.0 (0.04)
Piston ring-to- Top 0.025 - 0.055 (0.0010 - 0.0022) 0.08 (0.003)
ring groove clear ­
ance
.
Second 0.015 - 0.045 (0.0006 - 0.0018) 0.07 (0.003)
Cylinder-to-piston clearance 0.010 - 0.045 (0.0004 - 0.0018)
0.10 (0.004)
Connecting rod small end 1.0. 18.016 -18.034 (0.7093 - 0.7100) 18.07 (0.711)
Connecting rod-to-piston pin clearance 0.D16 ­ 0.040 (0.0006 - 0.0016) 0.06 (0.002)
TORQUE VALUES
Cylinder stud bolt (8 mm) See page 10-8
Cylinder stud bolt (10 mm) See page 10-8
Cylinder stud bolt (12 mm) See page 10-8
l'R·OUBLESHOOTING
Compression too low, hard starting or poor performance at low speed
• Leaking cylinder head gasket
• Worn, stuck or broken piston ring
• Worn or damaged cylinder and piston
Compression too high, overheating or knocking
• Excessive carbon built-up on piston head
ot
combustion chamber
Excessive smoke
• Worn cylinder, piston or piston rings
• Improper installation of piston rings
• Scored or scratched piston or cylinder wall
Abnormal noise
• Wornpiston pin or piston pin bore
• Worn cylinder, piston or piston rings
• Worn connecting rod small end