Im going to replace the plugs in my 2013 street glide with the 103 and I've been looking up what plugs everyone runs and haven't found a good solid answer. What the best bang for your buck?

 

I just use plugs from the Harley dealer. Never had any issues with them.

 

 

Stock plugs...

 

Stockers.

 

X2 on stockers

 

the OEM plugs are normally cheap enough

unless you have done something that requires you to change the heat range, then stick with what works

Harley uses a funky system to detect misfires, and it is heavily integrated with the plugs, wires, and coils.

Change those items away from OEM or a part that is known to match OEM, and the commuter does funky things.

there are no "magic spark plugs", although some of the multiple electrode plugs work well in high performance engines... we can get into a discussion of flame travel in the combustion chamber if you'd like, but from my experience the OEM's work just fine.

 

Yep. I tried the fancy NGK's on my Road King and it threw a check engine light at about 70-75 mph, consistently. Changed back and the problem went away. The problem went away and the bike ran better. Stockers for me from now on.

 

I appreciate all the feed back. Thanks everyone!

 

Harley store is too far away so I buy what I can elsewhere. I use NGK Iridium plugs and love 'em. No codes, no issues. And don't use anti-seize with NGK's per NGK (and most all of the other non-Harley brands per them). And check your torque after a ride, I've had my rear plug loosen up so I give it a couple of extra pounds.