Another Onan thread! Choke and/or throttle issue

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> One more thought, the carb was very clean when we got the machine. I only sent it away to Walbro as I didn't want to mess with tiny springs, and gaskets and such and something obviously wasn't right with it. I wonder if it was so clean because a PO cleaned it and then put it back on wrong. I am wondering if I were to adjust the screw on the wire holding it to the choke if I could make the choke wire stretch far enough to connect the carb arm and hold it in the open position as the default??? Is this what has happened to this at some point? I guess the answer will depend on whether it's default is supposed to be open (and closing when starting in the cold) or closed (opening once it gets running.

James, the default is for the choke actuator to be holding the choke OPEN on a cold, non-running engine; this is done by the coiled spring #1 I mentioned in a previous post.

Examine the situation while the engine is COLD and make sure the choke plate is OPEN at that time. If you flick the choke arm and feel spring resistance then you are moving it toward the NON-default CLOSED CHOKE position.

If your machine was in unknown condition when you received it then it is conceivable that the PO put something on wrong and the engine is not being choked when it should - and is being choked when it shouldn’t. I can send you a picture of the proper linkage if you wish.

There is not a major amount of tension required in the choke wire. If there is a lot of tension then something is put together incorrectly.

Ken already described a method of testing the choke actuator after DISCONNECTING the wire going to it. That is a good idea to try since it will show you the range of travel of the actuator arm. There’s only a few degrees of travel available.

—Jim

Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
 
Once again you all have come through. The choke plate was defaulting to the closed position due to a lack of tension from the wire connecting it to
the actuator. The wire had either slid through the bolt on top of the actuator or been adjusted incorrectly. I loosened the screw, slid the wire
almost to the very end and tightened it up again. The choke plate now is held in the open position!

After the adjustment I started it and could see the actuator pull it closed briefly before letting it open again and it idled by itself for several
minutes. I think I still need to fiddle slightly with the fuel adjustment screw in the carb but it was getting late and I thought one victory was
enough. Thanks to all!
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-James Palmer, Traverse City, MI
1976 Eleganza
 
Jim M is right It's an And/And logic statement. It has to be cold AND have voltage to close. A strange and well thought out system. Mine works
great and starts right up warm or cold. Sounds like 4 crank rotations worst case, and 1 sec touch when run recently. I have No add on primer button.
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John Lebetski
Woodstock, IL
77 Eleganza II
Source America First
 
Mine almost acts that way. It chokes when starting and immediately opens but not quite all the way. After 4 or 5 minutes of running slightly rich it
opens completely. I never bothered to try to fix it since it does open completely and runs normally after a few minutes of warm up time.
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana