Shindaiwa 357 Manuel de service télécharger pdf (Page 9)

Q Shindaiwa Inc. 1995 9

Troubleshooting The 2-Stroke Cycle Engine Section 2

4. Power (combustion)

The fuel-air mixture expands rapidly as it

burns, forcing the piston down the cylinder.

Piston movement is transferred to the crank-

shaft through the connecting rod, rotating the

crankshaft.

5. Exhaust

Expanding gasses continue to force the piston

downward, exposing the exhaust port. Most of

the spent combustion gasses are expelled

through the exhaust port.

6. Transfer

The piston’s downward movement com-

presses the fuel-air mixture drawn into the

crankcase during Step 1, causing the reed

valve to close. As the moving piston uncovers

the transfer port, the fresh mixture swirls

rapidly into the cylinder.

As the fresh fuel-air mixture enters the

cylinder, it also helps to push or

scavenge

any

remaining exhaust gasses out through the

exhaust port.

TROUBLESHOOTING

Figure 2.4 Reed Valve Induction System (reed valve closed)

CRB-74

Spark Plug

Transfer Port

(open)

Exhaust Port

(open)

Reed Valve

Closed

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Shindaiwa 357 Manuel de service Page 9