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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Motor - Spark Plug Tester
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danandlu
Navigator

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USA
174 Posts

Initially Posted - 02/28/2009 :  19:08:53  Show Profile  Visit danandlu's Homepage
Many times I've tried testing for spark when an engine won't start. One way I tried was to remove a spark plug, reattach its wire, hold the plug base to ground then crank the engine. It didn't always work - hard to do with only two hands. I've also tried inserting a screwdriver into the plug wire end and hold the shaft of the screwdriver near a grounding point. Again hard to do with only 2 hands and sometimes quite painful when indeed there is spark - zap!

I came across this handy item at NAPA, it was about $16.



If your motor won't start and you can confirm you have spark then you know it's a fuel issue (assuming you have compression, good plugs and the ignition is properly timed).

Dan Henderson
1982 FK/TR #3328
"Chesapeake"
Missoula, Flathead Lake, Montana


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Dave5041
Former Mainsheet Editor

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USA
3758 Posts

Response Posted - 03/01/2009 :  13:18:47  Show Profile
I have an inductive timing light from the old days of engine tuning, and something like that or this product will give you a quick and definitive answer that can save a lot of time.

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Voyager
Master Marine Consultant

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USA
5361 Posts

Response Posted - 03/01/2009 :  15:09:50  Show Profile
I have an old spark plug with a wire wrapped around the body and an alligator clip to connect it to ground. It's not ideal, but generally can be made to work. I like the NAPA gizmo

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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 03/02/2009 :  11:27:56  Show Profile
[url="http://www.harborfreightusa.com/usa/common/displayCoupon.do?week=1009&campaign=RetailA&page=coupon2.html&single=true&r=4256_199118&cust=77996830497&keycode=0000"]Follow this link to the actual coupon[/url]



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