contd •••••••••
3
untit belt snaps on. Repeat with the other belt.
6. These belts should be tight. By parting the belts against each other In
their running plane using forefingers and thumbs, the gap between the
two should not exceed
7.(".
If tension is incorrect remove the two lock-
bolts on front engine mounting forks. (Two top ones). Back off the front
nut on top crankcase bolts sufficient to allow tnner- nut to be slackened.
Adjust belt tension by moving the engine up or down as r-equtr-ed, When
tension
t
s correct, check alignment of pulleys with straight edge, and
adjust by moving the front of engine upwards or the rear down as
r-equtr-ed, Re-tighten nuts and fit top lock-bolts.
N.B. - The crankshaft pulley has already been tightened, should you ever
need to remove either the crankshaft pulley or the flywheel mag. you will
require special tools to hold the part being removed. NEVER tighten or
slacken by holding one against the other - this will distort the crankshaft.
The engine is now ready for the running-in procedure.
SKYCRAFT "SCOlfT" AIRCRAFT
"PIXIE" 173c.c. ENGINE
FUEL MIX
Do NOT use ready mixed blends of two-stroke fuel. ADD ONE THIRD PINT
of CASTROL SUPER. TWo-STROKE OIL to ONE GALLON of SUPER.
GRADE PETROL (40ml. :litre).
RUNNING-IN PER.
100:
It is advisable to run the engine for about half an
hour at quarter throttle before using the aircraft in fl ight.
Procedure:
1. Fasten the aft end of the fuselage securely with a stout r-ope,
2. Start the engine and run at a fast idle for three ten minute periods,
allowing the engine to cool completely between each running per-iod ,
3. With the engine qutte oold , tighten the four nuts at thebase of the
cylinder. (Spanner size - 7/16" A. F .).
4. Check the four cylinder head bolts for tightness.
5. Drain carburettor, inspect main jet and c1ean, if necessary~ Tighten
all screws and fuel li.ne connections.
Çheck all nuts, bolts, screws, split-pins, etc.
Spark Plug: Bosch No. W. 145-T 1•
Gap: 0.020".
General: Drain fuel tank frequently, particularly
i
n cold weather.
COMPlfTERISED IGNITION SYSTEM
Your "SCOlfT" Aircraft
t
s fitted with the Computerised Ignition System~
which e1i.minates points and condenser. The system requires NO
adjustment whatsoever. The intensity of the spark may be checked by
rotating the propeller briskly (spark plug removed) and, at the same time,
holding the H.T. lead about 1/8" from any earth point on the aircraft
fuselage.
WARNING~ Do NOT use a coit tester -
tt
witl destroy the system, and,
A flywheel spanner, which engages the squar-ed lugs on the
back of the flywheel MUST BE used when removing or
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