Spark plug for 107
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Tourer
Joined: Apr 2013
Posts: 432
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From: Savage
Spark plug for 107
I did a quick search but couldn't narrow it down enough to be helpful.
What spark plugs are you guys using in 107s around 10.5CR? I'm using Screamin Eagle plugs but wonder if they interfere with the ion sense and should switch back to stock?
What spark plugs are you guys using in 107s around 10.5CR? I'm using Screamin Eagle plugs but wonder if they interfere with the ion sense and should switch back to stock?
Tourer
Joined: Feb 2016
Posts: 310
Likes: 44
From: Out West
For your application, the HD 10R12 V-Rod plug should work fine ... as will most other plugs. I currently run NGK's a range cooler in my stock 103 as do many. In a previous 107 hot rod bike, I ran NGK Iridium's... no codes or issues. Gap is .035-.040, be careful with gaping the Iridium fine wire electrode, it can be damaged easily.
Outstanding HDF Member
Joined: Sep 2010
Posts: 2,630
Likes: 185
From: Mountain West, Big Sky Country
For your application, the HD 10R12 V-Rod plug should work fine ... as will most other plugs. I currently run NGK's a range cooler in my stock 103 as do many. In a previous 107 hot rod bike, I ran NGK Iridium's... no codes or issues. Gap is .035-.040, be careful with gaping the Iridium fine wire electrode, it can be damaged easily.
Stellar HDF Member
Joined: Jan 2013
Posts: 2,464
Likes: 50
From: Rouses Point, N.Y.
I Run NGK DCPR8E this is the standard plug and DCPR8EIX is the Iridium, gap was set at .035. On my two 107 builds that's what Hillside recommended one step cooler due to the higher compression had no concerns with the Ion sensing system. the Iridium plug gave me better fuel mileage.
Last edited by target64; Aug 22, 2016 at 04:41 PM.
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