On Thu, 20 Feb 1997, Dahman, Ken wrote:
...TR3s. I am using Champion RL87YC plugs as a replacement for the
> original, listed in the owners manual, Champion
> L10S plugs...
>
> My TR3A runs a little rich and seems to like it that way...even when not
> experiencing choke problems,
> the plugs run black. The TR6 discussion string brought up the question
> of whether hotter plugs would help reduce the black build up on the
> plugs and if so, what were the brand and code numbers to use.
I don't think it's necessarily a fault of the plug. If all is basically
well with the engine itself, and with ignition and carburetion, the plugs
probably shouldn't be black. (BTW, is the black dry or oily?) I don't
think changing heat ranges here would address the problem, although it
might do an end-run around the problem. ;-)
> In a similar topic, I was told that the R in the Champion RL87YC
> designated a Resistor plug and was I sure that I needed this type. Since
> I was told that this was the replacement for the L10S, I said yes.
> But a question arose as to what is a resistor plug and why does the TR3
> ( stock positive ground electrical system, no radio) need one.
Resistor plugs do nothing more than reduce interference with radios. You
don't need them if you don't have a radio, or if you have a radio but also
have suppression cables or cable ends, or....
OTOH, I don't know if it's still that easy to find a "straight" Champion
L87Y (no resistor, no copper core).
--Andy
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