GENUINE Blur 150, Service Manual

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A.Troubleshooting.
a.Compression pressure is too low, difficult to start engine and engine running
unsmoothly.
1.Cylinder head gasket cracked
2.Spark plug is not well locked
3.Piston ring worn out or cracked
4.Cylinder, piston worn out.
5.Reed valve is out of order.
b.Compression pressure is too high; Engine overheating; abnormal noise.
1.piston tip has too much carbon accumulated.
c.Abnormal piston noise
1.Cylinder and piston worn out.
2.Piston pin hole or Piston pin worn out.
3.Connecting rod small end or bearing worn out.
d.Abnormal piston or cylinder noise
1.Piston ring worn out or cracked
2.Cylinder worn out or cracked
B.The operation notice
1.Clean before operation to avoid particles dropping into the engine.
2.The contact surface of gasket must be clean.
3.Dismantle cylinder and cylinder head by screw driver. Do not injure the contact surface.
4.Cylinder inner surface and piston outer face can’t be injured. Contact
Surface should lubricate by specified oil.