spark plug size


Old 02-26-05, 10:09 PM
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Location: Michigan
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Arrow spark plug size

i want to buy a compression tester that i can use on snowblowers and lawnmowers but i dont know the size of the thread on the spark plugs. they are your standard champion plugs ( rj19lm cj8 ) they have a 5/8' hex to screw in but i am unsure of the thread any info/advice would be appreciated

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Old 02-26-05, 11:47 PM
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I don't remember the thread size, but any compression tester should fit, or come with an end to fit. It is a common size for automotive plugs too. For what it's worth, I don't trust a compression reading on small engines, so I don't do it often.
Old 02-27-05, 10:29 PM
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all pugs are 14 mm. All are metric except for very old ones in the auto line. Older ford are 18 mm(I think) It's been a while.

Old 02-28-05, 03:22 AM
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super's right...either 14 or 18 mill. I haven't seen a tester yet that didn't come with both.
Old 03-01-05, 06:30 AM
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thanks a lot

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