View Full Version : Lightning spark plugs

03-05-2008, 10:00 PM
I've to replace the spark plugs on my lightning as it's been coughing a bit from low RPM acceleration. Do i need anything special? I'm guessing its just a case of removing the air cleaner and seat and thats it i've got full access to both plugs?

15-05-2008, 04:10 PM
Hi TJ's that's about it. Here's what the book says:-

Replace every 10,000 mile (16,000 km) service interval.

Use only Harley-Davidson 10R12A spark plugs.
1. Remove left side air scoop to access front cylinder spark
2. Disconnect spark plug wire from front spark plug.
3. Using a 5/8 in. box end wrench and 5/8 in. spark plug
socket, remove front spark plug.
4. Remove seat.
5. Remove air cleaner assembly.
6. Disconnect spark plug wire from rear spark plug (use
automotive spark plug boot remover/installer if required).
7. Using a 5/8 in. wobble socket and 12 in. extension,
remove rear spark plug.

You probably have done it by now but better late than never:)

18-05-2008, 07:26 AM
Cheers Rob!
I haven't done it yet, been away on work so much haven't even looked at it! It's good to make sure i've got the right tools before hand. Thanks for your help!!!:60277EB7B04744289C0

22-05-2008, 07:19 PM
When will Buell (and harley for that matter) end their love affair with superglue????

I got the plugs and spanners and the T25 start screwdriver to take off the airbox and everything superglued in place. I don't mean stud grade, i mean locktite! Got the airbox cover off but cannot undo the 4 T25 star head bolts that hold the air box base in place, it broke the screwdriver head!!!!

What do i do now. Complain to a dealer about poor build qaulity? It's just out of warranty by a month or two and the airbox has never been off before....

23-05-2008, 08:55 PM
OK, all done! All my fault! The bolt heads were T27 not T25, when you buy a set of star heads you'd expect all the sizes really wouldn't ya! It took the thcik end of a mornin and 2 mates tool boxes to find a T27! Still p'd off with the locktite thing tho!
Bikes running just right now!

18-06-2008, 04:09 AM
All good above, just take care not to cross thread the rear plug when you are putting the new one in, it can be a bit fiddly to line up.

20-07-2008, 09:43 PM

I allways put a bit of copper grease round the plug thread , makes it go in an undo later easier.
the front plug will be easy to get too if you remove the air scoop , the rear will need the seat and air box removing.
a good tip , put a small cable tie round the ht lead it stops water running down the front ht lead from the air scoop, in heavy rain..
i found this out the hard way.
oh yeah an put one round the top of the rubber over the clutch cable adjuster (in front of the motor).:169B9ADF431545348BC:60277EB7B04744289C0
this will stop water getting in yer transmition oil.

26-08-2008, 09:00 PM
im running my xb12ss on hgk iridium and it runs better than the genuine harley(champion) originals
and i found the front one harder to do, to easy to cross cos very difficult to refit cos of the frame stopping your view

26-08-2008, 10:52 PM
glad i got a tuber then plugs easy as anything to change , Mind it still coughs and barks alot and thats just the bike :439:

27-08-2008, 08:58 PM
Same as Jinx:D 5/8" open ender is all I need, jobs done in 5 minutes,:439:

S1 old skool Buell.

29-08-2008, 09:53 PM
:D:D yeh but wheres the fun in not struggling ...