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Old 06-11-2005 | 10:45 AM
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Default RE: OK is it high nitro and cold plug or vice versa?
Typically,
High nitro = cold plug
low nitro = hot plug

the mc-59 is med to hot,
I use that plug with 20% nitro in my .12 engines
I think it will fire early with 30% in that engne
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