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Antique Engine Archives All archived posts from 1999 to 2004 when SmokStak was on EnginAds. This is a read-only board.

Antique Engine Archives

H-9 com spark plug

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Old 09-13-2004, 11:24:48 PM
Mac Leod
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Default H-9 com spark plug

Hello, I belive I read some where the H-9com spark plug is uncommon? I have one, and it has Ford on it also...any iterest/value. Can they be used on small engines? (Is it worth haveing?)


Mac Leod
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Old 09-15-2004, 01:48:46 AM
Andrew Mackey
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Default Re: H-9 com spark plug

Champion H-10 is the common one : the H series is a 14mm plug with a 1/2" reach. most small engines use the J series, which is a 3/8" reach plug. If you try to use the H series plug in an engine designed for a J, you may have an interferance problem with internal moving parts (for instance, do not use the H series plug in the 3 1/2 or 4 HP aluminum block Techempseh engines (valve in block engines) as the valves will impact the plug. You will bend the valves! The H-9 is a cooler running plug, than the 10 Andrew
Old 09-15-2004, 09:46:52 AM
Mac Leod
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Default Re: H-9 com spark plug


Mac Leod

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