TM 55-4920-384-13&P
2I7102C
Daily attention to the air cleaner and pre-cleaner is
Fig. 12, OPEN END VIEW OF MAGNETO
one of the most important considerations in prolong-
the magneto), until the breaker points are wide open.
ing engine life.
The opening or gap should then be measured with a
feeler gauge as shown in Fig. 11.
CARBURETOR ADJUSTMENT
Adjust breaker points as follows: First loosen the
The main metering jet in the carburetor is of the fix-
two locking screws on the contact plate enough so
ed type, and therefore requires no adjustment. The
that the plate can be moved. Insert the end of a smell
idle needle should be adjusted for beat low speed
screw driver into the adjusting slot at the, bottom of
operation, while carburetor throttle is closed by
the contact plate and open or close the contacts by
hand. For further information, refer to Carburetor
moving the plate until the proper opening is obtain-
Manufacturer's Instruction Bulletin in the rear of this
ed, see Fig's. 11 and 12. After tightening the lock-
manual.
ing screws, recheck breaker point gap to make sure
it has not then gad.
MAGNETO BREAKER POINT ADJUSTMENT
Replace magneto end cover and gasket carefully so
that they seal properly. For further information see
The magneto break or point gap is .015 inch at full
Fairbanks-Morse magneto maintenance instructions
separation. If the ignition spark becomes weak after
in the rear section of this manual.
continued operation, the breaker points may have to
be readjusted, resurfaced or replaced. Remove the
magneto end cover in order to examine the points. If
MAGNETO IGNITION SPARK
there is evidence of pyramiding or pitting, the points
If difficulty is experienced in starting the engine or
should be resurfaced with a small tungsten file.
if engine misses firing, the strength of the ignition
Points that are badly worn or pitted should be re-
spark may be tested by disconnecting the No. 1 igni-
placed. Check breaker point gap by rotating the
crankshaft with the starting crank, (this also rotates
Flg. 13
D-12
