Delta amplifiers may vary on cranking or running tests, 125 volts when cranked, and 220
or higher volts when running. Also when an ammeter is in series with amplifier and power
input, amperage will be .3 tenths at idle, and can increase to 5 amps at W.O.T. The
importance of a steady needle on both meters when making the running test is imperative,
any abrupt movement or waver, could indicate loose or broken harness wires, or a
malfunction within amplifier.
NOTE: The simplicity of this igntion system, unfortunately,
gave it one weak link. Check battery for capacity and condition before starting any tests.
Battery must be in top shape and fully charged.
NOTE: This test can be used on 1968 and 1969 55 HP engines
with the exception of breaker point check procedure, then refer to 1970 and 1971 60 HP
STEP #1 Checking Input Voltage
A. To check input voltage to pack with tester, set selector switch to 50 volt scale, and
the other selector switch set to plus (+). Black meter lead to engine ground, red meter
lead probe inserted into red wire at pack connector.
Turn on ignition switch, meter should indicate available voltage to pack, with probe still
in terminal, crank engine, voltage should not be less than 9-1/2 volts.
B. If less than 9-1/2 volts, check condition of battery, that it is no less than 70 amp
(or better) and all cells are good by using a hydrometer.
Battery good, check amperage draw of starter for correct specifications.
STEP #2 Testing Amplifier Output
A. To check amplifier output, the tester selector switch on plus (+) selector switch to
500 volt scale.
With black meter lead to engine ground, red meter lead probe inserted into blue wire
connector, crank engine, meter should indicate 250 voltage or higher. No indications on
meter at this point disconnect coil from circuit, and with S-80 or M-80 tester load button
"A" connect tester blue lead to blue wire coming from pack and tester black lead
to engine ground, crank engine, tester will indicate, pack is good, replace coil.
B. Tester does not indicate in step above, disconnect wire between amplifier and points,
with key switch in on position, touch amplifier connector to a ground intermittently
tester should indicate. No indication on tester, replace amplifier.
STEP #3 Testing Coil Output
A. Connect coil high tension lead to spark tester (gap set to 1/2"). A spark from
ignition coil lead should jump 1/2" gap while cranking engine. If spark is weak or
erratic, replace coil.
STEP #4 Checking Breaker Points
A. Points can be checked with timing light when running engine.
B. Engine does not run, disconnect point lead from amplifier, insert test light probe into
breaker point lead, then connect test light other lead to battery side of starter
solenoid. With key switch off and distributor in full advance, manually rotate flywheel
clockwise. Light will glow until each set of points open. This will occur as flywheel
timing mark passes pointer on lifting ring. If either set of points fails to break at
proper time, remove flywheel and set breaker points with feeler gauge to .010" old
(new points .012). Tighten breaker point base plate connections and check for proper
STEP #5 Check for Intermittent Miss
A. With tester selector switch set at plus (+) and other selector switch set at 500 volt
scale, black lead to ground, red tester lead probe inserted into blue connector at coil,
crank engine and run, meter should indicate 250 volts or higher, if meter needle wavers or
fails to reach 250 volts check coil, and battery.
B. Engine misses and meter is steady, connect a low reading D.C. (0-5) ammeter in series
between key switch and amplifier. Run engine at idle, amperage should be less than one
amp. Run engine to RPM that miss occurs, ammeter needle should be steady, needle wavers,
check for loose wires at battery input to amplifier. All wires secure, replace amplifier.
NOTE: The 55 and 60 HP breaker points are wired in delayed
parallel and both sets effect each cylinder.
Another timing mark must be added to flywheel to check timing of each set of breaker
points. To add mark to flywheel, measure exactly 1-3/8" (or 17 deg.) counterclockwise
from existing mark around the perimeter of flywheel, and mark as illustrated below:
STEP #6 Checking 55 and 60 HP Breaker Points
A. With key switch OFF and distributor full advanced manually turn flywheel clockwise
until existing mark on flywheel is aligned with boss on ring gear guard light should go
out, indicating one set of points has opened, continue to rotate flywheel until mark added
to flywheel is aligned with boss on ring gear guard. At this time test light should light,
indicating that other set of points have closed.
B. If timing is off, remove flywheel and rotate crankshaft clockwise until points are at
the widest opening. Set gaps to .010 (.012 for new points).