Generac Power Systems GP Series Diagnostic Repair Manual page 27

Problem 16 – Engine Starts Hard and Runs Rough
CHECK FUEL
GOOD
SUPPLY
LOW FUEL
REPLENISH
FUEL
SUPPLY
REPLACE MAGNETO
TEST 21 –
CHECK
CARBURETION
BAD
REPAIR
OR REPLACE
TEST 24 – CHECK
ENGINE / CYLINDER
LEAK DOWN TEST /
COMPRESSION TEST
Diagnostic Repair Manual
CHECK CHOKE
GOOD
POSITION AND
OPERATION
PUSH IN AFTER
STARTING
GOOD
TEST 28 – CHECK
AND ADJUST
GOOD
GOVERNOR
BAD
REPAIR
OR REPLACE
CHECK FLYWHEEL KEY
GOOD
BAD
TEST 19 –
CHECK
GOOD
SPARK
ENGINE MISFIRE
IS APPARENT
TEST 25 –
CHECK BAD
FLYWHEEL
GOOD
REPAIR OR REPLACE AS NECESSARY
REFER TO ENGINE SERVICE MANUAL
P/N 0C1103A FOR FURTHER ENGINE
SERVICE INFORMATION
Section 4 Engine Diagnostic Tests
TEST 20 –
CHECK
GOOD
SPARK PLUG
BAD
REPLACE SPARK PLUG
REPLACE
TEST 23 –
CHECK VALVE
ADJUSTMENT
BAD
GOOD
ADJUST VALVES
AND RETEST
21