spark plug
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Stellar HDF Member
Joined: Jun 2018
Posts: 2,296
Likes: 494
From: WI
spark plug
I maybe in the wrong thread, not sure....but I do have a honest question about harley's 6r12 plug. Why is it that the harley plug only reads 5 to 7 ohms cold and the rest of the cross reference plugs are anywhere from 4.5k ohms to say 5.5k ohms. The Harley dealers here do not not have an answer for me. I would really like to know..... Knowledge Is Power......
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Stellar HDF Member
Joined: Jun 2018
Posts: 2,296
Likes: 494
From: WI
Copy that!!!!! The indy I used 3 years ago talked me into NGK plug dcpr7e with out any problems... When installing new harley 6r12 plugs today, the NGK no.1 plug idle ring had sooty gas left behind on it, you could smell it.... Replaced plugs with 6r12's and when for a 4 mile jaunt...acceleration was smooth but idle was different... shot front cylinder intake with brake kleen and it killed the motor....Off to HD tomorrow for flanges and seals...Thanks for getting back to me....much appreciated...... Have a good night......And by the way, I researched using brake cleaner to find intake leak...not a good idea....I guess the burned fumes from the cleaner out the exhaust can be deadly....Live and learn
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
HD plugs are just champions. Nothing special about them except the cost. Like everything else HD, (motor oil, primary oil, etc.) they're not made by the moco but just have the label that commands a higher price tag. Personally I've never much cared for champion's plugs no matter the price tag and have always run NGKs but the DCPR8E/DCPR8EIX rather than the DCPR7E which is the same heat range as the stock champions.
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Stellar HDF Member
Joined: Jun 2018
Posts: 2,296
Likes: 494
From: WI
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Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
No, the DCPR7E is heat range equivalent. My wording is somewhat confusing I guess. I'm running 1 cooler than the stock heat range DCPR7E
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Seasoned HDF Member
Joined: Aug 2008
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The resistor’s biggest job is to help provide a sharp, clean ‘pulse’ type spark. If the spark ‘dribbles’ across the gap in the beginning, it doesn’t light the fuel/air charge properly. If it dribbles at the end of the spark, it eats away at the spark plug electrodes and other ‘arc gap’ components in the ignition, shortening their useful life. The lowest spark plug resistance that seems to perform the task of chopping off the front and back “tails” of the spark is about 500 - 600 ohms. Fortunately, excessively low resistance is almost never a problem.
i hate champion with a passion, seen brand new out the box plugs not work. if they are mfg for hd, probably to hd spec's per application.
i hate champion with a passion, seen brand new out the box plugs not work. if they are mfg for hd, probably to hd spec's per application.
Seasoned HDF Member
Joined: May 2008
Posts: 21,178
Likes: 12,754
From: South Carolina
I`ve been using Champions for 50 years, in every type of engine, never had a single problem.
If you get a bad spark plug bad out of the box, it has probably been dropped somewhere along the line.
If you get a bad spark plug bad out of the box, it has probably been dropped somewhere along the line.