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Old 02-25-2010, 08:48 AM   #1 (permalink)
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Spark plugs

I am looking for some Champion Spark Plugs, UP77V surface gap. I was told that these plugs are no longer available. I want the plug for a Evinrude Rotary Motor. Is there a substitute for the UP77V ? If not, where can I find these plugs, or a substitute? Any help is appreciated. Thank you. Dan.
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Old 02-25-2010, 09:26 AM   #2 (permalink)
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I saw a couple out on ebay but they want 50 bucks for them. I also found this info

UP77v IS 12mm with a.492 protrusion

UL77V is 14 MM with a .472 protrusion

champion plug number 299 / QA55v is a 12 mm surface gap plug but it has a .750 reach so a spacer would need to be machined to space it back to fit... then there is the heat transfer issues.. but spark plugs...with extentions work .. it is worth a try.. or even a thought...

If tapped out to 14 mm.. any of the 14mm with .472 reach surface gap plugs could be installed.. 3 ranges were shown on the champion racing plug chart 833/L 78V , 831 / UL 77V, 827 /L 76V,, hotter to colder ... left to right..
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Old 02-25-2010, 12:30 PM   #3 (permalink)
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Theres no replacement...

So you either spend the big money to get a replacement, make a replacement or clean what you got...
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Old 02-25-2010, 03:34 PM   #4 (permalink)
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I have heard of some using the 14mm long plug with a spacer to set the electrode at the correct place.
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