Spark plugs
Road Master
Joined: Aug 2008
Posts: 1,246
Likes: 251
From: Belle River Ontario
I believe Harley brand plugs are made by champion. Just remember just cause it says Harley on it, does not mean it’s made by Harley. Last time I looked Harley didn’t have an oil refinery....tire factory,...
Outstanding HDF Member
Joined: Mar 2015
Posts: 2,840
Likes: 900
From: Philly Suburbs
I've used Autolites for years. One thing to be careful about: The screw-on terminal top will get loose, and may cause a reduction in performance when it does so. I've tried several things... I used to just grab the top with pliers and make it super tight, but it would eventually come loose still (except the one that I made too tight, and the insulater cracked). Next I tried a drop of blue loctite, but the environment of high temps and vibration wasn't right for loctite. I seem to have it permanently solved now, though... I have a very small lock washer (same diameter as the terminal) under each terminal, tightened until the washer is flat. They haven't loosened up since...
HDF Community Team
Joined: Apr 2018
Posts: 2,574
Likes: 1,067
From: Ohio
I bought a pair of Pulstars at a swap meet because they were cheap enough that I figured I'd give them a try. Ive been running them since February and I can tell zero difference between them and the champions I took out. As long as its correct for your application, a plug is a plug is a plug.
Trending Topics
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
I bought a pair of Pulstars at a swap meet because they were cheap enough that I figured I'd give them a try. Ive been running them since February and I can tell zero difference between them and the champions I took out. As long as its correct for your application, a plug is a plug is a plug.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post