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Hit & Miss Gas Engine Discussion

Jack Junior Electrical System


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  #1  
Old 11-05-2006, 01:59:01 PM
Harry R. Harry R. is offline
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Default Jack Junior Electrical System

Hello, I have recently acquired a F M Jack Junior engine,ser no. 149576. I am at a loss as to how to wire the ignition system. It has a breaker that works against the exhaust valve governor arm & what seems to be an ignitor on the front left side of the combustion chamber. I'm new here & as soon as I can figure out how to put pics of it on here I will. It has enough compression to bounce back when spun. All the governor components look good & function. Any help would be deeply appreciated & THank You All! Harry R.
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Old 11-05-2006, 02:16:45 PM
Harry R. Harry R. is offline
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Default Re: Jack Junior Electrical System

Sorry about the double post, the other post has pics.
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Old 11-05-2006, 08:11:58 PM
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Preston Wells Preston Wells is offline
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Default Re: Jack Junior Electrical System

What you are refering to as a breaker on the exhaust rocker is actually a spark saver. As the engine sits stopped thia breaker will contact an ajustable screw in the rocker arm making contact and completing the ignition circuit. Simply attach you battery ground to the terminal on this breaker , connect your battery positive to a low tension coil (I use an automotive AC coil , but you can also use an auto coil connecting to the 2 small terminals only) and connect the coil to the ignitor. This should complete the circuit. Dont use a buzz coil as this will weld your ignitor points together. Hope this helps and have fun in this great hobby.

Preston
FL
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