10-1
Cylinder / Piston
10. Cylinder / Piston
Service Information
10-1
Trouble shootint
10-1
Cylinder
10-2
Piston
10-3
Piston/Cylinder Installation
10-5
Service Information
Geaneral
When removing the cylinder, avoid damaging the cylinder joint part with a driver or cooling pin by
hitting the cylinder strongly.
Avoid damaging the inside of the cylinder and piston surface.
Lower or uneven compression
Worn piston
Worn, damaged piston rings.
Worn cylinder.
Excessive smoke from muffler
Worn cylinder, piston, and piston rings.
Improperly installed piston rings.
Damaged piston, cylinder.
Over heating
Excessive carbon deposits on piston head.
Piston noise
Worn cylinder and piston.
Worn piston pin, connecting rod small end.
Damaged piston rings.
Excessive carbon deposits on piston head.
Troubleshooting
Item
Standard
Service Unit
I.D
56.500-56.510(2.2244-2.2248)
56.60(2.228)
Cylinder
Outer of round
0.1(0.004)
Taper
0.05(0.002)
Warpage
0.1(0.004)
Piston O.D.
56.470-56.490(2.2232-2.2240)
56.37(2.219)
Piston pin hole I.D
15.002-15.008(0.5906-0.5909)
15.04(0.592)
Piston
Piston Pin O.D
14.994-15.000(0.5903-0.5906)
14.96(0.589)
Piston Pin
Piston pin-to-piston clearance
0.002-0.14(0.0001-0.0006)
0.02(0.001)
and
Piston ring-to-groove
top
0.015-0.045(0.0006-0.0018)
0.09(0.004)
Piston Ring
clearance
second
0.015-0.045(0.0006-0.0018)
0.09(0.004)
Piston ring
top/second
0.10-0.25(0.004-0.010)
0.5(0.02)
end gap
oil(side rail)
0.2-0.7(0.01-0.03)
1.1(0.04)
Piston-to-cylinder clearance
0.010-0.040(0.0004-0.0016)
0.15(0.006)
Connecting rod small end I.D.
15.010-15.028(0.5909-0.5917)
15.06(0.593)
Connecting rod small end-piston pin clearance
0.010-0.034(0.0004-0.0013)
0.04(0.002)
Specifications
Unit: mm(in)
Summary of Contents for DAYSTAR VL125E
Page 12: ...1 11 General Information...
Page 13: ...1 12 General Information...
Page 14: ...1 13 General Information...
Page 15: ...MEMO...
Page 23: ...MEMO...
Page 39: ...Fuel System 4 0...
Page 91: ...MEMO...
Page 96: ...MEMO...
Page 97: ...7 0 Clutch Gearshift...
Page 110: ...MEMO...
Page 111: ...8 0 A C Generator Starter Clutch...
Page 120: ...MEMO...
Page 121: ...9 0 Cylinder Head Valve...
Page 138: ...MEMO...
Page 139: ...10 0 Cylinder Piston...
Page 147: ...11 0 Crank Case Transmission Crankshaft 1 2kgf m 12N m 1 1kgf m 11N m...
Page 159: ...12 0 MEMO...
Page 166: ...13 5 MEMO...
Page 167: ...14 0 Front Wheel Front Fork Steering...
Page 189: ...15 0 Rear Wheel Rear Brake Suspension...
Page 201: ...16 0 Hydraulic Brake...
Page 213: ...17 0 Charging System Battery Regulator Rectifier Fuse Battery AC Generator...
Page 221: ...18 0 Ignition System A C Generator Spark Plug Ignition Coil ECU...
Page 226: ...18 5 Ignition System...
Page 227: ...18 6 MEMO...
Page 228: ...19 0 Electric Starter Starter Motor Battery Starter Magnetic Switch...
Page 235: ...MEMO...
Page 236: ...20 0 SERVICE Lights Switches Horn...
Page 247: ...MEMO...
Page 248: ...21 1 Wiring Diagram 21 Wiring Diagram...
Page 249: ...21 2...