Resistor Spark Plugs?
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- This topic has 7 replies, 6 voices, and was last updated 9 years ago by XR55.
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March 10, 2015 at 9:21 pm #891
In looking to order spark plugs for my 1936 Muncie Neptune OB34A, 4 hp twin,
I found a chart that suggested using Auto-lite 386 (18mm plugs).
They are listed as "Resistor" type spark plugs.
What’s your thoughts as far as using resistor type spark plugs in a magneto
system?
Thanks, TGPrepare to be boarded!
March 10, 2015 at 10:45 pm #11759That’s the trouble with spark plug charts. They’ll tell you to use anything that fits the hole. As a general rule, resistor plugs are to be avoided in outboards, with a few exceptions. And I don’t think that Muncie would be one of them.
March 11, 2015 at 1:07 am #11766I have an OB34A in the shop I am going to restore, ,it has Champion UD-14 plugs in it. My Champion Spark plug chart shows usage of the 6M plug
http://www.richardsoutboardtools.com
classicomctools@gmail.comMarch 11, 2015 at 2:00 am #11770Thanks for the input guys. I’ll check out the champion 6M
Prepare to be boarded!
March 11, 2015 at 2:29 am #11773Save the resistor plugs for the modern CD ignition systems.
March 11, 2015 at 3:57 am #11785I Have Champion #516 or D-16 in mine. Set at 0.025". I was recommended those Autolight 386’s some time back and bought a dozen of them. They don’t work on any of our old motors.
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