Question about 2008 Harley Davidson FXDB Dyna Street Bob

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What's the spark plug gap for a 2008 street bob?

Posted by Anonymous on

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I recommend to anyone wishing to do even minor work on their own Harley, buy the shop manual. With clear instructions I have been able to do a lot of work that would have cost more than the manual. Since the year 2000 I have replaced seals in the front forks, brake pads, and done all the oil changes myself which I know would have cost a lot more at the dealer. The manual is very detailed and gave me the confidence I could do those things safely and not have to worry about something going wrong on the road.


Now about the spark plugs.
Gap them at .040, use locktite anti seize and torque to 15 lbs.

Tighter and you risk stripping the threads, they are only aluminum. Looser and they may back out.

Ride safe, ride longer.

Posted on Mar 02, 2015

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Posted on Jan 02, 2017

bozcro
  • 867 Answers

SOURCE: ran wires through handle bars and relocated front

you will have to check your work, if you soldered and taped should be no prob. marrets are not good enough for this job due to bikes vibation

Posted on Sep 13, 2009

wd4ity
  • 4565 Answers

SOURCE: i am putting a double

No, you shouldn't need to change the springs but you may need to adjust the pre-load on the shocks to carry the additional weight of another rider.

Good Luck
Steve

Posted on Mar 06, 2011

wd4ity
  • 4565 Answers

SOURCE: what is the spark plug

0.038" - 0.043"

Steve

Posted on May 15, 2011

bdrew1340
  • 448 Answers

SOURCE: What is the spark plug gap for a 2008 Harley XL1200C

Set the gap at ,040"

Posted on Nov 04, 2012

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What is the gap for a FLHX 2008


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

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Hi Anonymous, 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,
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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.
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Hi Anonymous, and the usual suspects are:
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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 discarged.
6. Damaged wire or loose connections at battery terminals especially the ground cable at BOTH ends, ignition coil, or plug between ignition sensor and module.
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Hi Anonymous, the HD 6R12 spark plug is gapped at .040" Have nice day.

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1 Answer

2010 dyna street bob wont start but will crank over


First determine if you have spark. Pull a plug wire off and insert a spark plug in the wire. Lay it so it touches the engine. Crank the engine and see if there is a spark. If not you have a problem with the ignition system.

If you have spark but it won't start you may not be getting fuel to the engine. I have not worked on a 2010 but I suspect the gas tank has a valve that is actuated by the engine. No engine RPMS to create a vacuum, the valve stays shut. When the engine fires, the vacuum opens the valve and lets fuel flow. Once in awhile the diaphragm in that valve fails so the valve cannot open, no gas, no start.

Try the spark test first in an attempt to learn more. Then address the fuel issue if that proves not to be the problem.

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4 Answers

What are the spark plug gap specs for a 2008 Kia Rio?


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Hope this helps

Bob

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