Posted May 25, 2017 - 04:49 PM
- chieffan said thank you
Posted May 25, 2017 - 04:55 PM
Did you check compression? they can break a rod and still run on 1...
- KennyP and chieffan have said thanks
Posted May 25, 2017 - 05:08 PM
- Oldford said thank you
Posted May 25, 2017 - 05:13 PM
Why dose my case 446 with Onan only fire on one cylinder. Has great compression spark on both sides and gets gas both sides. The silly thing is it will not fire on both sides....... What the dilly is going on?
Sure its not a one cylinder?
Posted May 25, 2017 - 05:53 PM
The Onan ignition fires with one coil for two cylinders. It jumps the sparkplug normally on one side goes through the block and jumps backwards on the other side. Thus it completes the circle beginning and ending at the coil. You of course know a typical briggs and stratton fires every time the piston comes up. Even though it is a 4 cycle, it fires every time like a 2 cycle, every other spark accomplishing nothing. The side of the Onan on compression fires and the opposite side does nothing. If you had a sparkplug with the electrode touching the center part, your Onan would run like a single cylinder instead of a twin. Or somehow the ignition is completing the circle without going through one sparkplug, Say perhaps a sparkplug wire was shorted to the block.
- KennyP, boyscout862 and Sawdust have said thanks
Posted May 25, 2017 - 06:08 PM
Posted May 25, 2017 - 06:33 PM
- Cvans said thank you
Posted May 25, 2017 - 06:46 PM
- Gtractor and Cvans have said thanks
Posted May 25, 2017 - 07:18 PM
I would just replace both plugs to se what happened. Plugs being relativly cheep and having spares so handy. Don
- Cvans and Sawdust have said thanks
Posted May 25, 2017 - 07:55 PM
Posted May 25, 2017 - 08:43 PM
Spark testers are about $10 and nice to have.
I had the same thing once and it was the condenser. I only will use the Onan Condenser.
- Oldford and 637Yeoman have said thanks
Posted May 26, 2017 - 08:17 AM
- Sawdust said thank you
Posted July 30, 2017 - 12:42 PM
Posted July 30, 2017 - 01:40 PM
Might be the intake is sucking air at the seam on that side! Been known to happen to these! With the choke on, you richen the mixture enough it will fire.