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Old 06-24-2016, 09:08 PM   #1
KRAZYMATT
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Default Autolite AR3910X Spark Plug

Does anyone have any input on this spark plug? I was given one and after searching the part number it seems it's a pretty popular plug for the 212 clone motors. Some of the threads I read swear it adds power this and that... I have a predator 420cc motor and the manual for it is a generic one that covers the 212, 346, and 420cc motor. In the specs it says all 3 call for the same torch spark plug "f6tc". I am running a ngk "bp6es" in mine and it seems to run good. Could maybe go one level higher on the heat range. Just wondering if anyone uses or has used this auto lite racing plug in their 390/420/440/460 engines and what the results were.
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Old 06-25-2016, 02:27 AM   #2
Shepard
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Default Re: Autolite AR3910X Spark Plug

I just installed one in my new VC460 -- I'll post the results after installment.
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Old 06-30-2016, 12:33 PM   #3
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Default Re: Autolite AR3910X Spark Plug

I installed this plug in my cart today but haven't put any time on it yet. Wonder if it will be any noticeable difference like most the people online claim... I had ngk plug in their prior with no issues, just wanted to see what all the hype is about.
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Old 08-27-2016, 04:36 AM   #4
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Default Re: Autolite AR3910X Spark Plug

Just checking in to report on the Autolite AR3910X spark plug. I have a little over 25 miles on this plug. It has not missed a beat -- I'm going to pull it this weekend and take some pictures and see what color it is. It is a surface fire plug -- the fire isn't hidden. I can't say if it increased my power cause I've run it from the start.
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Old 08-27-2016, 05:31 PM   #5
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Default Re: Autolite AR3910X Spark Plug

Here it is in all its glory. The AR3910 surface fire spark plug. Burns clean where it needs to - runs just a little rich - a little soot on the outer sides. It has about 25 miles on it -- usually 3-4 miles a run. I think it will be asset to the performance of the 460. I still have to lean it up a little. Looking for that caramel brown color of a proper mixture.
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Old 08-27-2016, 06:16 PM   #6
TX Foilhead
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Default Re: Autolite AR3910X Spark Plug

Can you gap that plug or is it fixed where it is?
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Old 08-27-2016, 08:08 PM   #7
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Default Re: Autolite AR3910X Spark Plug

It's a fixed gap. According to Autolite its good for 50 hours run time.
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