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Discussion Forum

Re: CA Spark Plugs

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Bryan Smith

05-03-2002 08:18:02

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I've used Champion J-8, AC 45, AC R45, and Autolite 303 spark plugs in my CA and other 6 volt tractors and vehicles on the farm. Autolites seem to run the best in my CA and they sure make the B we bought this spring run sweet (haven't tried them in the WD45 yet). My old Willys jeep (with 12 volt conversion) runs good with them too - it also called for that same spark plug. Champions seem to run the worst (and don't last long). AC's did pretty well but I think the AC R45 is no longer available (think the substitute is an AC R46 now) and the AC 45 has been out of production for a while.

I've been told an Autolite 295 (non-resistor) is for a magneto ignition tractor (but can be used with battery ignition) and an Autolite 303 (resistor-type) is for battery ignition. Your CA probably has battery ignition - you could use fiber-core plug wires if you needed to. ONLY use copper-core wires for magnetos and it's probably a good idea to use them on any 6 volt system (I use copper-core on my 6 volt stuff - I get them from NAPA here. The local CarQuest doesn't carry them). 12 volt converted tractors seem to use the fiber-core wires with no problem.

I've also had a bad Champion and a bad AC plug straight out of the box. When you pull the plug wire slightly off you're increasing the voltage potential before the plug fires (longer effective gap) and so it fires - had the same problem on an air-cooled engine once that turned out to be burned points. The spark plug must be faulty in the inside somewhere.

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Mike (Oh)

05-03-2002 12:15:25

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 Re: Re: CA Spark Plugs in reply to Bryan Smith, 05-03-2002 08:18:02  
Ok you got me to thinking about the difference between the autolite 295 and 303 plugs. My CA has a mag and I just got 303's for it. I just called the dealer and they told me they did not believe the 303's are a resistor plug. I tried searching for autolite on the web but found no information on these plugs. More than once though I have seen it referenced that 295's should be used if mag and 303's if bat ignition. Does anybody know for sure if the 303's are resistor or non-resistor?

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Bryan Smith

05-03-2002 12:52:29

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 Re: Re: Re: CA Spark Plugs in reply to Mike (Oh), 05-03-2002 12:15:25  
I was told by "someone who is supposed to know" that the 303 is a resistor-type and the 295 is not, but I'm not sure of that. As long as they work good in your application ....! ;-)

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