Section 5 Engine Diagnostic Tests
26 Diagnostic Repair Manual
Problem 19 – Engine “Hunts” / Erratic Idle (220/410/530cc Non-EFI Engines)
Problem 20 – Unit Will Not Idle (220/410/426/530cc Non-EFI Engines)
Problem 21 – Unit Will Not Come Off Idle (220/410/426/530cc Non-EFI Engines)
BAD
BAD
REPLACE
REPAIR OR
REPLACE
GOOD
GOOD
BAD
BAD - ENGINE
MISFIRE APPARENT
GOOD
TEST 23 –
CHOKE TEST
TEST 20 –
CHECK
SPARK
TEST 21 – CHECK
SPARK PLUG
*Acceptable running limits for the engine are between 59-62 Hertz.
ADJUST / RE-TEST
TEST 24 – CHECK
VALVE
ADJUSTMENT
NO
SURGING
STILL
SURGING
TEST 22 –
CHECK
CARBURETION
GOOD
TEST 30 – CHECK
AND ADJUST
GOVERNOR
BAD
REPLACE
REPLACE MAGNETO
GOOD
TEST 27 –
CHECK
FLYWHEEL
*Acceptable running limits for the engine are between 59-62 Hertz.
REPLACE FAULTY
COMPONENT
GOOD
FOUND BAD COMPONENT
TEST 37 – TEST
IDLE CONTROL
(STEPS 1 - 11)
FOLLOW
TROUBLESHOOTING
PROCEDURES
BAD
TEST 1 – CHECK
NO-LOAD VOLTAGE
AND FREQUENCY
REPLACE FAULTY
COMPONENT
FOUND BAD COMPONENT
TEST 37 – TEST
IDLE CONTROL
(STEPS 12 - 13)
*Acceptable running limits for the engine are between 59-62 Hertz.
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