Page L-4
ELECTRICAL
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notes, Cautions and Warnings.
B
Do not arc spark plug wire to ground. Connect to a
known good spark plug and ground plug to a clean metal
surface (muffler, cylinder, etc.). Permanent damage may
be caused to the coil or ignitor if the plug is not grounded
properly.
If the engine will
not
run, but the starter will turn the
engine, proceed as follows:
1. Check for loose terminals, wires and connections.
2. Check for an electrical discharge through the spark
plug wire as follows: Using a spark plug that is known
good, and with a spark plug installed in each cylinder,
place on a clean grounded engine surface, (muffler,
cylinder, etc.). Turn over the engine with the starter.
Look for a blue electrical arc at the spark plug elec-
trode.
3. If there is either a weak arc or no arc, try a new spark
plug, then check the condition and the tightness of
the spark plug wires. Plug wires can be checked by
substituting them with good ones.
4. Replace the plugs if necessary. Gap the spark plug
.028" - .030" (.71 - .76 mm) using a wire type spark
plug gauge.
Testing the Ignition Coil
Set the meter to the ohms scale, measure the resis-
tance between both primary wire terminals and between
the secondary wires (Ref Fig. 3 on page M-5). A normal
reading would be: Primary (+ and -): 1.87 - 2.53 W and
Secondary (A and B): 10.8 - 14.6K
Ω
. If readings
obtained are out of the above ranges, replace ignition
coil.
Testing the Pulser Coil
Unplug the connector leading into the engine. Place the
(-) probe from the DVOM (set to the ohms scale) on the
red/white wire from the pulser coil, and the (+) probe on
the black wire also from the pulser coil. A reading of
433.5 - 586.5
Ω
should be observed. If the measure-
ment obtained is out of this range or if a reading of no
continuity is displayed, replace the pulser coil. Make
certain that the air gap is correct. Set with a .032” feeler
gauge. There is no timing adjustment.
TESTING STARTING CIRCUIT
To prevent the possibility of injury resulting
from vehicle inadvertently starting, disconnect
battery for steps 1 through 8 (see Section “B”).
Tool List
Qty. Required
DVOM ......................................................................... 1
If the engine will
not
turn over, proceed as following
(Ref. Fig. 1 on Page L-2):
1. Check the battery for a voltage reading which should
be between 12.2 and 12.5 volts. Inspect for loose or
dirty battery post connections.
2. Check for a blown in line fuse and replace if neces-
sary with a 7 amp fuse.
3. Check for loose wires at all terminal connections.
4. Check the complete electrical system for correct cir-
cuitry.
5. Inspect for worn insulation or bare wires touching the
frame. Bare wires will cause a short circuit.
6. Check for continuity through the key switch. Set the
DVOM to the ohms (
Ω)
scale. Detach wires. Place
positive (+) probe on one terminal and negative (-)
probe on the other terminal. The reading on the meter
should be “0”
Ω
with the switch key in the
‘
ON
’
posi-
tion and a visual signal (
∞
) with the switch
in the
‘
OFF
’
position. If the meter does not register, replace
the switch. Reconnect the wires.
7. Turn the key switch to
‘
OFF
’.
(a) Place one probe of the DVOM (set to ohms scale)
on the red wire at the solenoid. Place the other
probe on the key switch terminal with the blue
wire.
(b) Press the accelerator and observe the DVOM. A
reading of less than 2
Ω
indicates a good limit
switch. A reading of greater than 2
Ω
indicates that
the switch terminals should be checked. A reading
of infinity a visual signal (•) indicates that the
switch must be replaced. Connect the battery.
8. Check the starting solenoid operation. Turn the key
switch to the
‘
ON
’
position.
(a) Place the DVOM (set to the appropriate DC volts
scale) negative (-) probe on terminal “A” of the
solenoid. Place the positive (+) probe on terminal
“B”. The DVOM should indicate approximately 12
V.
