Action Of Piston In The Torque Induction - Yamaha GT1 Service Manual

WHAT IS THE TORQUE INDUCTION-
Action of Piston in Torque Induction
3-2. Action of Piston in Torque Induction
1. Piston Moves Up from B.D.C.and Closes
Exhaust Port
Fuel-air mixture entering cylinder through main,
auxiliary transfer and 5th ports forces burned
gases toward exhaust port.
As piston moves up, crankcase pressure decreases,
leading to negative.
As inlet port arranged in piston skirt begins to
overlap with cylinder inlet port, negative pressure
in crankcase causes reed valve to open, and fuel-
air mixture streams into crankcase.
2. Piston Closes Exhaust Port and Moves
Up
to
T.D.C.
Fuel-air mixture transferred into cylinder through
main, auxiliary transfer and 5th port is compressed
by piston, ignited just B.T.D.C., and burned.
Piston skirt clears inlet port, fuel-air mixture
streams into crankcase through piston inlet port
and cylinder inlet port.
3. Piston Moves Down from T.D.C.and Opens
Exhaust Port
Heated, high pressure burned gases produced by
"explosion" pushes piston downward. High pres-
sure of burned gases begins to push piston head.
As piston lowers, fuel-air mixture entering crank-
case in intake stroke is compressed.
-14-
Fig. 3-2-1
Fig. 3-2-2
Fig.
3-2-3