CE8117_0908_BRIGGS & STRATTON Trouble shooting flow chart.pdf
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For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983
TROUBLESHOOTING FLOW CHARTS
www.mymowerparts.com
Bowl Style Carburetor Troubleshooting
Hunts and Surges
Will Run only on Prime
Will run only if the choke is used
Determine that the governor
system is functioning properly
using the proper isolation techniques
Troubleshoot
governor system
Does the engine still hunt and surge?
No
Y e s
Done!
Partially engage choke
or gently touch primer bulb
No
Inspect, clean or replace
mainjet and retest
Does the engine improve?
Y e s
Does the engine still hunt and surge?
No
Remove and clean
carburetor, retest engine
Y e s
Replace
Carburetor
Does the engine still hunt and surge?
Y e s
No
Flow Chart Key
Done!
Problem
Question
Answer
Action
Result
Compression Diagnostics
Troubleshooting Flow Chart
Check for proper top
no load speed by
model and type number
Low Power
Is the top no load speed OK?
Y e s
Is there a parasitic load?
No
Y e s
Don’t Know
Check bowden wire/throttle
control for full range travel
Low or High
Y e s
Disengage load by
removing belts, etc.
No
Is it correct?
No
Still low power?
Repair as
needed
Repair load issues
as needed
Partially engage choke
Check for intake tract leaks,
gasket leaks, loose/leaking
carburetor space blocks,
loose/leaking crossover tubes
Does speed increase or
engine run more smoothly?
Y e s
Is leakage detected?
Y e s
No
No
Repair as
needed
Perform leakdown test
Overhaul carburetor looking
closely for obstructed jets
Reading
acceptable
Is leakage detected?
Adjust
valve lash
Leakage
unacceptable
Flow Chart Key
Problem
Question
Answer
Action
Result
Repair as
needed
Compression Troubleshooting Flow Chart
Check/repair
fuel system
Engine Smokes
What color is the smoke?
Black/Gray
Excessive Oil Consumption
Does oil level drop more
than one ounce per hour?
White/Blue
Y e s
Is Engine Smoking?
Y e s
No
Was engine tipped?
No
Y e s
No
Oil use
acceptable
Check for oil
fouled
lter element
Check for over
lled oil level
Check for fuel contaminated oil
Check for proper viscosity
Is the
lter fouled?
No
Leakage
unacceptable
Rapair/replace
faulty components
Y e s
Reading
acceptable
Perform Crankcase
Vacuum Test
Is leakage detected?
Replace and run
Engine for ten minutes
Perform Leakdown Test
Y e s
Is Vacuum Test OK?
Is it still smoking?
Low
No
Y e s
External oil leaks present?
No
Re-check all work
Check breather system
Check crankcase seals
Check block for porosity
Y e s
Done!
No
Is vacuum now ok?
Repair as
needed
Done!
Y e s
Flow Chart Key
Problem
Question
Answer
Action
Result
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