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Discussion Starter · #1 ·
When in the small repair business what champion spark plugs should a shop keep on hand for repairs and over the counter sales?
 

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Discussion Starter · #3 ·
What about any of these?

dj8y, n11yc, rcj8y, cj8, cj6y, cj7y, cj8y, rn14yc, rn11yc4, rn9yc,rn11yc, cj8, cj4, h10c, Rc12yc ,j8c ,dj6yc, J10c ,dj7yc

I know to keep the j19lm on hand.
 
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