Service Manual

Reassembly
1. Install a new filter, if necessary.
2. Mount the fuel tank using two spacers and
3. Route the fuel hose behind the governor
4. Connect the hose to the carburetor.
IGNITION
Testing Spark Intensity
The ignition system can be checked for spark
intensity using a spark tester, part number
1. Pull off the plug connector and remove the
spark plug.
2. Inspect the plug for wear, carbon deposits
and damage. Replace the plug if damaged,
burnt or fouled.
3. Check for the correct plug gap and adjust, if
necessary, to
.7 .8 mm (.028 in. .032
in.).
4. Attach the spark tester and set the tester
gap to 4.2 mm (.166 in). (4 turns counter-
clockwise from the closed position.)
two screws.
arm.
41
-7890.
5. Pull the starter and observe for spark.
6.
If the spark is evident, the ignition system is
operating properly.
If no spark is evident,
proceed to testing kill switch operation.
Testing Kill Switch Operation
There are two ignition kill systems, one for zone
start, and one for BBC and commercial appli-
cations. Both systems depend on a lever
contacting a grounding tang to ground the
ignition and stop the engine.
BBC and Commercial Kill Systems
1. Make sure the kill wire is properly con-
nected to the grounding tang on the throttle
control. See Fig. 3-12.
2. When the throttle control is in the “run”
position, the throttle lever should move
away from the ground tang. See Fig. 3-13.
In this position, the ground tang should not
have continuity to ground. This can be
tested by disconnecting the kill wire and
testing the tang with
a volt-ohmmeter. Place
the volt-ohmmeter on RX1 with one probe
on the tang and one probe on ground. There
should be a reading
of infinity (no-
continuity).
3. In the “off” position, the throttle lever should
contact the ground tang. This will ground
the ignition and stop the engine. See Fig.
3-1
4.
Figure 3-14
Figure 3-1
2
15
Zone Start Applications
1. Make sure the engine kill wire is connected
to the ground tang. See Fig. 3-15.