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Have a good one here . it will spark like made if spark plug is not in cylinder but as soon as you screw in into cylinder it loses spark.
 

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How do you know its losing spark when you install plug....did you try spraying in some carb cleaner or starting fluid to see if it pops....just a little spray....it could be a fuel delivery issue if it pops...

Also is the spark you see nice an blue...and make a nice crack sound...thats a good spark if so...
 

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I have seen plugs spark in the open but when put under compression they don't. Buy a new plug and try it. Worse case is you will have an extra spark plug.
 

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Welcome to the board!
 
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