Trouble_Shooting_carb_and_compression BRIGGS & STRATTON.pdf

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For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983
Compression Systems and Carburetor Troubleshooting:
TROUBLESHOOTING COMPRESSION SYSTEMS
Problem prior to testing
Test Result
Solution
Investigate for other (non-compression)
problems
Lack of power or starting problem
Reading is green - minimal air flow
Reading is green - minimal
(audible) air flow with small amount
coming through the head gasket
Lack of power or starting problem
Replace head gasket
Check that the piston is at TDC on the
compression stroke, rotate 720°, lock the
crankshaft, and retest. If the reading is
correct, investigate the possible problem
with that component.
Reading is green - all the air
escaping from one component
Lack of power or starting problem
Check that the piston is at TDC on the
compression stroke, rotate 720°, lock the
crankshaft, and retest. If the reading is
correct, investigate the possible problem
with that component.
Reading is red - all the air
escaping from one component
Lack of power or starting problem
Check that the piston is at TDC on the
compression stroke, lock the crankshaft,
and retest. If the reading is correct,
investigate the possible problems starting
with the component that appeared to leak
the greatest volume of air.
Reading is red - the air escaping is
from several components
Lack of power or starting problem
CARBURETOR PROBLEM SOLVING CHART
Problem
Cause
Solution
Flo-Jet carburetor leaking after being
transported
Float bounce
Use the fuel shutoff valve
Fuel tank too far above carburetor
causing excessive pressure at the
needle valve
Lower the tank to a maximum of 45"
above the carburetor
Loose, missing, incorrectly
assembled/adjusted, or damaged
parts
Flo-Jet carburetor leaks during
operation
Correct parts problem
Contaminated fuel
Clean system/replace fuel
Lower engine speed to idle before
shutting down
Long coast-down period
Flo-Jet carburetor leaks shortly after
engine is shut OFF
Fuel leaking past main nozzle
Clean/replace emulsion tube/nozzle
Loose, missing, incorrectly
assembled/adjusted, or damaged
parts
Correct parts problem
Engine dies at idle, runs normal at
high speed-full load, but surges when
running at high speed-no load
Idle passage is blocked
Clean the passage
Engine runs normal at high speed
with or without load, but at idle it runs
rough with a rhythmic idle
Idle air bleed is blocked
Clean air bleed
Engine runs normal at high speed
and idle with no load, but at high
speed under load there is a severe
loss of power and the engine dies
High speed pick-up tube partially
blocked
Clean obstruction
At idle, engine is running slightly fast.
At high speed under load it is very
rich, blowing black smoke, and top
speed does not exceed 2200 rpm.
At top speed with no load it is also
slightly rich
High speed air bleed is partially
blocked
Clean obstruction
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