Four Stroke Cycle Operation - Royal Enfield ELECTRA Service Manual

FOUR STROKE CYCLE OPERATION
SUCTION COMPRESSION POWER EXHA·UST
STROKE STROKE STROKE STROKE
Inlet Valve Open Closed Closed Closed
Exhaust Valve
Closed Closed Closed Open
Piston Movement TDC to BDC BDC to TDC TDC to BOC BDC to TDC
Gas Flow Air Petrol Air Petrol Air petrol burns. Exhaust gas
mixture is mixture gets gas expands. flow out.
drawn into compressed. Piston is Towards stroke
cylinder Few degrees pushed down. end,fresh
BTDC, spark plug flows in. charge
produces spark.
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1st stroke
2nd stroke
Jrd stroke
4th stroke