As stated, the 4 plugs started in '17 with the Milwaukee 8 engine, which you do not have.

 

RTFM.....worth its weight in gold.

Fix My Hog is a nice generic reference, and usually not model year specific.

 

Welcome Chris to the HDFORUM. Up to 2016, Harley had the twin cam (TC) motor. The 2017 Tour had the first M8 motor with 4 plugs.

This may help..

https://partsfinder.onlinemicrofiche...davidsonmc/930

Only as a suggestion make another new thread over in the newmember welcome area to say hello.

 

Refine your search to inclued "Harley Twin Cam spark plugs" and see if you get different results.

Paul

 

Your bike is not an M8, the 2013 is a Twincam with only 2 spark plugs.
Read your owners manual and get a service manual, they were clear up any further confusion.

 

1. Get a H-D Service Manual for your bike.
2. When in doubt, refer to #1.
3. Learn to use resources available to you.
4. May want to check your owner's manual also for valuable information.

 

When looking up parts, put the year of your bike in the search.

 

HOLY CRAP!!
I know HD likes to design things that are hard to reach sometimes but having to remove the tanks to access a pair of plugs is just diabolically evil!!
WTF were they thinking!!!

 

No need to get your panties in a twist! Change interval is 30,000 miles. How long does it take you to ride 30,000 miles? 10 years or longer?

Only takes a couple minutes to loosen and spin the tank around for plug access.

 

That and removing the gas tank is no big deal.