Question about 2002 Harley Davidson FLSTF - FLSTFI Fat Boy

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Trying to find out what to gap spark plugs at on my feul injected 2002 1450 harley davidson fat boy

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.038-.043 Per the HD manual

Posted on Jun 06, 2010

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Why are my Harley Fat Boy rpm's unstable with Caltex petrol at sea level?


Hi, Eric and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system, carburetor and/or filter.
12. Old dead or bad fuel.
13. Fuel tank vent system plugged or carburetor vent line closed off.
14. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
15. Carburetor controls misadjusted.
16. Damaged carburetor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes
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1 Answer

Do i have to use harley spark plug for 1999 hd fatboy


Hi Anonymous, the simple answer is no, just make sure the non Harley spark plug that you use has the correct heat range, thread type and length, radio resistant, and correct gap. Good luck

Apr 02, 2014 | 2003 Harley Davidson FLSTF Fat boy

1 Answer

02 fat boy backfiring and won't idle


Hi Chuck_brock, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Aug 10, 2012 | 2002 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

2000 hd fat boy no spark to spark plugs


HAVE THE COIL CHECKED, IF NOT LOOK FOR THE GAP OF THE BREAKER POINTS.

Jul 31, 2012 | Harley Davidson FLSTF Fat boy Motorcycles

1 Answer

2000 flstf factory carb or fuel injected?


Hi Anonymous, both for more information about your question please visit the websites below. Good luck and have nice day.
2000 Harley Davidson FLSTF FLSTFI Fat Boy

Jun 12, 2012 | 2000 Harley Davidson FLSTF Fat boy

1 Answer

99 harley davidson fat boy spark plug gap


Hi Anonymous, HD 6R12 spark plugs are gapped at .040" Have nice day.

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1 Answer

What spark plugs for harley 2004 fatboy do you use


Hi Anonymous, the HD 6R12 spark plug is gapped at .040" Have nice day.

May 11, 2012 | 2004 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

Harley Davidson 2003 FLSTF Fat boy spark plug number


Hi Anonymous, the HD 6R12 spark plug is gapped at .040" Have nice day.

May 09, 2012 | 2003 Harley Davidson FLSTF Fat boy

1 Answer

1998 dyna wide glide


check fuel level and petcock.getting fuel? next check for spark ground spark to cylinder fins and crank motor, no spark check cam postion sensor for voltage while cranking (if fuel injected check crank positoin sensor for voltage) if you get voltage replace coil

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