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Old 09-13-2025, 03:00 PM
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Jay S Jay S is offline
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Join Date: May 2018
Location: Nebraska City, Nebraska
Posts: 2,585
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We had an engine that was under performing and it turned out the stock heat range spark plugs were too hot. A worst case once a newly built engine would only idle until we changed to a colder plug. It can be a night and day difference. Just offering things to try.


Last edited by Jay S; 09-13-2025 at 03:24 PM.
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