kymco mo x500 Instruction De Maintenance

 

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                                                                                                      Unit: mm (in)

Item

Standard

Service Limit

I.D.

92.005 (3.6802)～92.015 (3.6806)

92.1 (3.684)

Warpage

0.01 (0.0004)

0.05 (0.002)

Cylindricity

0.01 (0.0004)

0.1 (0.004)

True roundness

0.01 (0.0004)

0.1 (0.004)

Ring-to-groove

top

0.03 (0.0012)～0.065 (0.0026)

0.08 (0.003)

clearance

Second

0.015 (0.0006)～0.05 (0.002)

0.065 (0.0026)

top

0.15 (0.006)～0.3 (0.012)

0.5 (0.02)

  Piston,

Ring end gap

Second

0.03 (0.012)～0.45 (0.018)

0.65 (0.026)

  piston ring

Oil side rail

0.2 (0.008)～0.7 (0.028)

1 (0.04)

Piston O.D.

91.96 (3.6784)～91.98 (3.6793)

91.9 (3.676)

Piston O.D. measuring position

10 mm from bottom of skirt

－

.

Piston-to-cylinder clearance

0.01 (0.0004)～0.045 (0.0018)

0.1 (0.004)

Piston pin hole I.D.

22.002 (0.8801)～22.008 (0.8803)

22.04 (0.8826)

Piston pin O.D

21.994 (0.8798)～22 (0.88)

21.96 (0.8784)

Piston-to-piston pin clearance

0.002 (0.0001)～0.014 (0.0006)

0.02 (0.001)

Connecting rod small end I.D. bore

22.016 (0.8806)～22.034 (0.8814)

22.06 (0.8824)

• 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.

• Worn or damaged cylinder and piston rings

• Worn or damaged piston rings

• Worn, stuck or broken piston rings

• Worn or damaged cylinder and 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