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Posted by John Mechanic on Tuesday, November 17, 2009:

In Reply to: JD 316, Onan B43E, will not start posted by Bill on Tuesday, November 17, 2009:

Let’s start from the bottom of your question and work up.

Any engine (ANY ENGINE) the breaker points is a crucial part of the ignition timing. On a engine that doesn’t have a distributor it is the only way to set the ignition timing (the wider the point gap the earlier the earlier the ignition will fire, ie. Before Top Dead Center.

Yes the coil fires both plugs at the same time. They made one coil with two sparkplug wires coming out of it, one for each cylinder.
Remember the cycles of a four stroke engine (Suck, Squeeze, Bang, Blow). This is a two cylinder engine, both pistons come to the top of the cylinder bore at the same time (one on the pistons is on the compression stroke, the other is on the exhaust stroke) so yes the coil fires both plugs at the same time.

Now let’s jump back to the start of your question.
“It seems to have good compression”. Did you check it with a compression tester or by plugging the spark plug hole with your finger (that was for the geeks)? Personally I use the finger method, because if the engine has enough compression to blow your finger out of the hole it has enough compression to run!
As for the starting fluid (Be careful with that stuff) that tells me it is Fire/Spark that is your problem not fuel.
Check the Ignition points that both sides are flat and smooth. File the contacts of the points with a point file or your wife’s emery board (she will love you for that, I know), or go to your local John Deere or Onan store and buy a new set on ignition points & condenser than adjust them with a feeler gauge and then with the breaker points closed slide a piece of clean white paper between the contacts to remove any oil or grime.
The engine should then run.
I hope I was some help

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