Hello All,
Recently have had a problem and have not had much luck finding the answer with countless google searches! I have recently changed the factory plugs on my 13 street glide for new factory plugs. I gapped them using a round gapper from autozone and put the electrode in the middle of the line at .40. When I went to start the bike it started real rough... I then checked the gap on the old plugs and one had the electrode right in the middle of the .40 line and the other was at .45. The bike seems to run fine going down the road, but doesn’t fire up as nicely as she used to. I would appreciate any help from this amazing site full of experienced folks!

Thanks!!

 

If you have a late model touring bike that uses 6R12 plugs then 40 is where you want to be. Unless you have gotten a cracked plug (unlikely) I doubt that the problem is plug related.

 

A gap difference of .005 will make little difference on a street bike. I agree with Retop, but in your case, I would install a difference set of plugs and give that a try.

 

Try the Gap at 0.35 and see how she runs !!

 

Put the old ones back in and see how it runs.

 

Put the old plugs back in, test the bike. Does it now start easily and run smoothly? If so, at least one of those new plugs is bad.

Replace one of the old plugs with one of the new plugs. Test the bike. Does it now start easily and run smoothly? That new plug is good. If it starts hard and runs poorly, the new plug is bad. Replace it.

Replace the 2nd old plug with the remaining new plug. Test the bike. Does it now start and run easily and smoothly? If so, both plugs are good and you've a different problem to chase down and correct. If it starts hard and runs poorly, this 2nd new plug is bad. Replace it.

 

Thanks for the help guys! I figured i would just widen the gap just a little before trying the old plug trick and it seems to be starting better now. I will keep the old plugs just in case. Cant express enough how great this site is!!