1. Poor cylinder compression
Normal fuel supply system
Normal ignition system
Piston ring is so worn to over
its wear limit
Replace a set of piston rings
Spark plug is not installed
tighten or without a gasket
Air leakage between cylinder
block and cylinder
Check cylinder gasket and the
flatness of the surface by which
cylinder black on-tacting with
cylinder head; tighten cylinder bolts
in the order to stipulated torque
Check valve clearance and tightness,
repair if necessary
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