How’s this plug look
Grand HDF Member
Joined: Apr 2007
Posts: 3,725
Likes: 3,070
From: Brighton, MI
It can still be a useful tool for those who do not use the AFR monitors, or fill in the gaps till they do get it. YD
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,080
Likes: 2,157
From: Ohio
That is the most detailed plug chart I've seen, can work for someone if a Wego is out of reach
Seasoned HDF Member
Joined: Jun 2015
Posts: 10,287
Likes: 7,767
From: West Central FL
Nice. That looks just as good as my plugs and I've never even used an AFR tthingamajigie.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
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
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,080
Likes: 2,157
From: Ohio
You are correct buuuuuuutttt: Turbo Blue 110 contains tetraethyl lead which adds color to a plug and the lost additive, our town has a station that sells it. Downfall, too much of it will lift a tank liner and hard on a O2 sensor if you try a Wego.
Octane booster adds color but purple, still doesn't read easily, Aviation fuel if you have a plane or contacts, still comes back to if you can get real fuel like mentioned. Reading plugs is harder than putting a wet noodle in a wildcats a$$ with today's oxygen rich fuel but older bikers still want to rely on plug reading, creatures of habit and those wildcats do get pissed off too.
Octane booster adds color but purple, still doesn't read easily, Aviation fuel if you have a plane or contacts, still comes back to if you can get real fuel like mentioned. Reading plugs is harder than putting a wet noodle in a wildcats a$$ with today's oxygen rich fuel but older bikers still want to rely on plug reading, creatures of habit and those wildcats do get pissed off too.