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Old 12-11-2012, 04:39 PM   #1 (permalink)
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Spark plugs

What is the difference between a solid core plug and a regular plug... my machines use the same plugs type but one uses a solid plug.


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Old 12-11-2012, 08:24 PM   #2 (permalink)
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So are you referring to solid core plug wires? Plugs usually aren't referred to like that... There are resistor based plugs, and non-resistors. Non-resistors are an old design and can screw with electronics because of the noise they generate. Anything that called for them originally simply did that because that was all that was commonly available at the time, and it will run fine on a modern plug.


Plug wires are basically the same. In the olden days, solid core plug wires were used by the hot rodding crowd because they potentially offered more power over carbon core. Well, that was a LONG time ago, noise suppressing plug wires are basically standard and there is no power loss. Same thing applies, anything that called for solid core will run fine on a modern noise suppressing plug wire.
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Old 12-11-2012, 08:35 PM   #3 (permalink)
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I don't know the exact terminology.... the spark that both of my sleds us is a BR9ES put, but it seems there is two types of BR9ES plugs... the top end of one spark plug is metal with A hole in the top.... while the other spark plug is solid with no hole. One sled (I just bought this year 2000 indy trail touring came with the plug that is solid... while my other sled 1986 enticer 340T uses the Br9ES plug, but the one top end of the plug is hollow. This the best i can describe.

Thanks

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Old 12-11-2012, 08:42 PM   #4 (permalink)
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The "Solid Core" BR9ES has a solid metal cap on the top (as you mentioned) and a solid core all the way through. Supposedly, they dissipate heat better than the non solid core plugs. That would potentially help them last longer over the long haul. The reality is that you'll foul them long before they will degrade from being "too hot".
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Old 12-11-2012, 08:46 PM   #5 (permalink)
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The ones with the holes are threaded on and can be removed to accommodate spark plug caps that are designed to fit over the threaded end, the ones without the holes are on piece and can't be removed.
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Old 12-11-2012, 08:55 PM   #6 (permalink)
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So does it matter what plug i use.. threaded or solid?

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Old 12-11-2012, 08:55 PM   #7 (permalink)
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Quote:
Originally Posted by Rczr600rider View Post
The ones with the holes are threaded on and can be removed to accommodate spark plug caps that are designed to fit over the threaded end, the ones without the holes are on piece and can't be removed.
Yep. Completely spaced that little fact.
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Old 12-11-2012, 09:02 PM   #8 (permalink)
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Yep in meaning it does matter what plug I use?

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Old 12-11-2012, 09:20 PM   #9 (permalink)
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it does not matter... as long as the plug part number is the same.
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Old 12-11-2012, 09:21 PM   #10 (permalink)
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In theory, the threaded ones could loosen up from vibration, but I've never had it happen. Otherwise they perform equally.
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Old 12-11-2012, 09:54 PM   #11 (permalink)
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Quote:
Originally Posted by dbiron View Post
Yep in meaning it does matter what plug I use?

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No. Not yes as in yes, yes as in no. Wait. What?



Run either... you'll be fine. I was commenting that I forgot that the solid core plugs, in addition to supposedly have better heat dissipation, also had a non-removable cap.

I run the solid ones in my sleds. For the extra $.40 it costs me per pair, I know I can't do any better with the plugs.
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Old 12-12-2012, 08:44 AM   #12 (permalink)
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I've had issues before with the plugs with the screw-on caps. Usually they work fine, but I have had issues with those coming loose and losing spark.
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Old 12-12-2012, 09:09 AM   #13 (permalink)
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I've had issues before with the plugs with the screw-on caps. Usually they work fine, but I have had issues with those coming loose and losing spark.
Screw the plug into the head then grab the cap with pliers and "torque" it down a bit. Don't dig too hard or you'll cut into the metal of the cap and interfere with the connection from the cap. You could put a rag over the cap to help protect the cap too.

Or, you could spend an extra $.40 and not have to worry about it.

Your experience is EXACTLY why I don't buy the screw cap plugs any more... Not worth even ONE incident of loss of spark.
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Old 12-12-2012, 09:27 AM   #14 (permalink)
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I usually don't have pliers on me, but my hands qualify.
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