Service manual

After the exhaust port is fully open and the intake
port is fully closed, further piston travel starts to
open the transfer ports. The compressed fuel/air
mixture from the crankcase th en travels up the
transfer ports and into the combustion area.
After most of the burned exhaust gases have left
the cylinder, an incoming charge of fuel/air mix -
ture scavenges the combustion area giving it a
fresh charge and the cycle is then repeated. (Fig.
1-lD).
Because lubrication is dependent on the mixing of
oil and fuel, it is extreme ly important that good
quality oil and gasoline are properly mixed. The
proper ratio of oil to gasoline will prevent
possible engine overheating, piston or cy lind er
scoring, or eventua l engine seizure. Too much oil
and not enough gasoline can lead to incomplete
combustion, fouled pl'-'gs, carbon build-up and
muffler clogging.
SERVICE MANUAL · 1975 SCORPION BRUT
INTAKE
EXH/UST
TRANSFER
FIG. 1-1
1·3