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Cub spark plug threads for compression gauge?

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pgmrdan
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Joined: Wed Aug 11, 2004 11:21 am
Location: Central Iowa

Cub spark plug threads for compression gauge?

Postby pgmrdan » Sat Dec 25, 2004 6:21 pm

What's the thread size of a Cub spark plug?

I want to get a compression gauge and need to make sure it has an adapter that will fit a Cub.

Thanks,
Dan
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Jim Becker
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Postby Jim Becker » Sat Dec 25, 2004 6:32 pm

18MM. Most testers should work with it.
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Lurker Carl
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Postby Lurker Carl » Sun Dec 26, 2004 12:01 am

If you have an old engine (not a Cub) with a big obsolete sized sparkplug, most modern compression testers will not fit the hole. You can make a reducer by removing the porcelain insulator and center wire out of an old plug. It's a bit of work to break the guts out of a sparkplug! Once you have only the threaded metal shell left, screw it into the plug hole and you can then use a hand-held friction fit compression gauge.
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