TROUBLESHOOTING AND ELECTRICAL SYSTEM
Troubleshooting Guide
11
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
REFER TO
Fuel tank is empty
Fuel System section
Fuel line or filters clogged
Fuel System section
Fouled spark plug
See Spark Plugs on page 10-11.
Spark plug wire damaged or loose
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Engine flooded with fuel as result of excess
choking
See Owner’s Manual, Controls and Indicators.
See Choke.
Fuel pump malfunction or failure
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Ignition coil failure
Test Procedure 12 – Ignition Spark on page
Kill circuit grounded
Test Procedure 15 – Key Switch (Engine Kill
Carburetor solenoid failure
Test Procedure 16 – Carburetor Solenoid
Engine turns but fails to start.
Improper idle governor adjustment
Engine section
Fan screen is partially blocked or plugged
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Governor is improperly adjusted
Engine section
Engine overheats.
Carburetor is too lean; check main jet size
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Excessive carbon deposits on piston head or
in combustion chamber
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Spark plug heat range is incorrect
See Spark Plugs on page 10-11.
Engine pre-ignites.
Unsuitable or contaminated fuel
Fuel System section
Exhaust valve is restricted with carbon deposit
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Muffler or exhaust pipe restricted with carbon
or other substance
Exhaust System section
Ignition coil failure
Test Procedure 12 – Ignition Spark on page
Air filter is dirty or clogged
See Air Filter Replacement on page 10-13.
Governor is improperly adjusted
Fuel System section
Throttle linkage out of adjustment
Engine section
Low cylinder compression
See the Briggs & Stratton Vanguard engine
manual (CC P/N 103568101).
Spark plug failed
See Spark Plugs on page 10-11.
Restricted fuel flow
Fuel System section
Loss of engine power.
Clutches are not backshifting properly
Clutches section
TABLE CONTINUED ON NEXT PAGE
2009-2012 XRT 950 Maintenance and Service Manual
Page 11-9
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