Electronic Governing Check; Service The Spark Plugs - Briggs & Stratton FORTRESS Series Installation And Operation Manual

significantly reduces frequency fluctuation experienced when
the engine is under higher loads.
The electronic governor system is composed of a stepper
motor (A) and stepper motor throttle control linkages (B).
The control board contains a digital controller that processes
engine speed information and sends appropriate commands
to the stepper motor to control the position of the engine
throttle.
Since the electronic governing system controls the engine
throttle demand based on generator load, the following
service codes and/or conditions can be related to an
electronic governing system issue:
• Engine Does Not Start
• Over Speed
• Under Frequency
• Unstable No Load Engine Control
While troubleshooting these conditions, a verification of
the electronic governor system can be initiated through the
control panel – Actuator Test.

Electronic Governing Check

The generator has an electronic governing check feature that
will turn on the stepper motor and move the throttle linkage
clockwise and counterclockwise within the throttle limits. The
test will rotate the stepper motor and move the throttle arm
between the wide open throttle and dead idle limits for up to
10 seconds. This will allow visual verification that the stepper
motor is functioning correctly and the control linkages are
connected. The engine will not attempt to start during this
test. If the stepper motor does not move, or if a linkage binds,
then service will be required.
NOTICE If stepper motor does not move, please make
sure the stepper motor connector is attached.
30

Service the Spark Plugs

WARNING
Unintentional sparking could cause fire or electric shock
resulting in death or serious injury.
WHEN ADJUSTING OR MAKING REPAIRS TO YOUR
GENERATOR
• Disconnect the spark plug wire from the spark plug and
place the wire where it cannot contact spark plug.
WHEN TESTING FOR ENGINE SPARK
• Use approved spark plug tester.
• DO NOT check for spark with spark plug removed.
Changing the spark plugs will help your engine to start easier
and operate better.
1. Push the ON/OFF Switch on the side of the generator to
the "OFF" (0) position.
2. Remove utility power to the generator to de-energize the
battery charger.
3. Remove the roof.
4. Remove the 15 Amp fuse from the fuse holder at top of
the control box.
5. Disconnect the negative (-) cable at the battery.
6. Clean the area around spark plugs.
7. Remove and inspect spark plugs.
8. Check electrode gap (A) with wire feeler gauge (B) and
reset spark plug gap to recommended gap if necessary
(see Engine Specifications at the end of this manual).
9. Replace the spark plugs if the electrodes are
pitted, burned or the porcelain is cracked. Use the
recommended replacement spark plugs (see Engine
Specifications at the end of this manual).