Fault Diagnosis; Disassembly Of Air Cylinder - Generic Trigger X 50ccm Owner's Manual

Air
cylinder
clearance between the piston
ring and piston ring groove
Piston and
piston
ring
Outer diameter of piston pin
Clearance of piston pin hole and piston pin
Bore diameter of connecting rod small end

11.2 Fault diagnosis

·If bad startup or unsmooth low speed occurs，inspect whether white fume is ejected out of the crankcase
breather. If the crankcase vent hole does have white fume ejected, the piston ring must be worn out, burnt out
or the piston must be broken.
Low compression pressure
·The piston ring is worn out，burnt out or broken.
·The air cylinder piston is worn out or damaged.
Compression pressure too high
·The piston combustion chamber has carbon deposit.

11.3 Disassembly of air cylinder

Disassemble the cylinder body.
Disassemble the gasket and scrape clean the adhesive
gasket at the cylinder junction.
Inspect the wear and tear of the cylinder inner wall.
Severe wear and replace it.
Item
Bore diameter
Bent
Cylindricity
Roundness
Interface clearance
Outer diameter of piston
Clearance of piston and air cylinder
Bore diameter of piston pin hole
Standard value
40.27-40.28
Top ring
Second
ring
Top ring
Second
ring
40.22-40.23
12.002-12.008
0.002-0.014
14.995-15.006
ite fume in vent pipe
·The piston ring is worn out or damaged.
·The air cylinder piston is worn out or damaged.
Piston noises
·The air cylinder piston and piston ring is worn out.
·The piston pin hole and piston pin are worn out.
gasket
- 89 -
Allowable
0.015-0.05
0.015-0.05
0.1-0.25
0.1-0.25
0.04-0.06
11.994-12
limit
40.3
0.05
0.05
0.05
0.09
0.09
0.5
0.5
40.2
0.1
12.04
11.96
0.08
15.06
cylinder