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Hit & Miss Gas Engine Discussion

Nelson Bros. model N temporary ignition?


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  #1  
Old 06-03-2012, 01:26:29 PM
Zira Zira is offline
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Question Nelson Bros. model N temporary ignition?

I have a Nelson Brothers (tagged as Bohon) about 1-3/4 hp. This engine originally had an ignitor and a webster mag, but it is missing the mag & the linkage to trip the mag is broken. I would like to rig up a temporary ignition system without making any major alterations to the engine. The easiest thing looks like putting a spark plug on it, and rigging up a buzz coil that fires every revolution, whether on compression cycle or exhaust cycle, and regardless whether the detent is latched out (coasting) or not. I would prefer to use the original ignitor if I could figure out how to trip it. So:
1. Did Nelson Brothers ever use ignitor with coil & battery on these (or similar) engines? If so, can anyone post pictures/advice of how the trip mechanism works?
2. If I don't use the ignitor, any suggestions on rigging up a buzz coil or regular ignition coil to fire only on compression when the detent is not latched out?

Also still looking for a model N manual if anyone knows where to get one (Hit & Miss, Starbolt, and Lee Pedersen do not have it).

Thanks!
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Old 12-09-2013, 03:01:01 PM
jlelandthomas jlelandthomas is offline
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Default Re: Nelson Bros. model N temporary ignition?

You can a single battery type ignition coil by simply unhooking the small wire coming from the original coils and put a wire to the neg side of an ignition coil .Ground the battery to the block and hot side to the plus side of the coil with the coil wire run to the spark plug .Also you would want to install a resistor in the hot side to help maintain the points .
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Old 12-09-2013, 08:57:18 PM
Ed Stoller Ed Stoller is offline
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Default Re: Nelson Bros. model N temporary ignition?

I have an Ottawa with no ignition and am doing something similar. I made a cover plate for the igniter port and installed a spark plug it. I am using a conventional coil, ballast resistor and a Points Saver(OvernightSolutions.com) to make the points easy. I used a magnetic reed switch on the cam gear at first and it did not work out. The engine had other problems and would not start. I got tired of cranking and let it roll backwards on compression and it fired with the piston before TDC. Ouch! I am just now getting back to it after a year or two. You might try to set up a simple point contact as the Point Saver ony needs a little trigger signal and has a built in static timing light, LED.
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Old 12-10-2013, 10:01:44 PM
Zira Zira is offline
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Default Re: Nelson Bros. model N temporary ignition?

I ended up making a cover plate & putting a spark plug in it. I went with a buzz coil tripped by the camshaft lobe as it was easiest without permanently messing up the engine, and I already had a couple extra "Boz" coils that I made from instructions on Harry's page. It runs very well.

I have advertised for the correct magneto a few times on EngineAds but no luck so far. Maybe Santa will find one for me...
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Old 12-11-2013, 09:20:37 PM
Handiman Handiman is offline
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Default Re: Nelson Bros. model N temporary ignition?

I'm not to sure about the original ignition for your engine but the pics show what i've done before. I used a buzz coil and a plate over the ignitor hole. This was on a throttle governed engine but would work for a hit and miss.
While it's latched out the coil will fire the plug but that won't hurt anything.
Ted
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