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SS16 Onan not firing


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#1 Gary from Muleshoe OFFLINE  

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Posted December 27, 2016 - 08:23 PM

OK this is a new one on me. My SS16 Onan 16hp will only fire when I release the starter but does not start. I am thinking one of two thing, ignition switch or the coil. What do the experts say?

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#2 grattone OFFLINE  

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Posted December 27, 2016 - 08:43 PM

If it fires at all I would think the coil is working. To me it would be timing or the switch (most likely the switch).

 Not a expert , just my 2 cents.



#3 ducky OFFLINE  

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Posted December 27, 2016 - 08:48 PM

Run a B+ wire to the positive side of the coil and see what happens.

It should fire when the engine is turning.   This would indicate a bad key switch.


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#4 greenb6901 OFFLINE  

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Posted December 28, 2016 - 05:31 AM

From 55 to 57 Chevy cars would have the ignition switch go bad and as long as you held the key all the way over to crank, the engine would run. Let go of the key to run and the engine would stop. Bad switch for sure.

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#5 John Arsenault OFFLINE  

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Posted December 28, 2016 - 06:58 AM

Bad ignition switch most likely. I have had the same problem, engine will turn over but not fire until you release the key to run position. Your start circuit is suppose to provide power to the coil at the same time its turning the engine over and its not. If you do what ducky said it will prove that its the switch. 



#6 Gary from Muleshoe OFFLINE  

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Posted January 01, 2017 - 08:30 PM

Ok I think I got the firing problem figured out, two things cobbled up wiring and the points were out of adjustment. After adjusting the points it ran like a top for about 30 minutes then it started acting like it was flooding out. So I just acquired a parts tractor which is pretty much complete. A friend told me it could be the coil, I swapped it out again ran good for a few minutes then started doing it again. I pulled the breather cover off and it is spraying gas out of the carb. I have cleaned the carb adjusted the high and low idle, change fuel filter, set float adjustment, and new plugs. What am I missing here. I am not finding much on line except others have had this problem as well, but no real solutions.



#7 MH81 OFFLINE  

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Posted January 01, 2017 - 08:38 PM

I have one that does that as well, but I believe it to be the valves need adjusted.
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#8 Gary from Muleshoe OFFLINE  

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Posted April 28, 2017 - 02:38 AM

After a lot of tinkering and scratching my head. I finally got it going and running like it's supposed to. It came down to a warped points housing. I had changed everything else so figured why not try it and sure enough it fixed my problem. Who would a thunk it.

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Edited by Gary from Muleshoe, April 28, 2017 - 02:39 AM.

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