Another Carb Settings Question...

Tom Bowman · Oct 21, 2014

The TO-20 starts fine, BUT: if I try to open up the throttle immediately after starting, it tries to stall out and die.

If I let it run at low idle for 10 seconds or so, I can open up the throttle with no problems. (I also have the throttle idled all the way down to start.)

Is that normal? Or a carb setting issue? Or something else?

Sorry not to have more information, but that's all I know.

Jason S. · Oct 21, 2014

(quoted from post at 22:34:15 10/21/14) The TO-20 starts fine, BUT: if I try to open up the throttle immediately after starting, it tries to stall out and die.

If I let it run at low idle for 10 seconds or so, I can open up the throttle with no problems. (I also have the throttle idled all the way down to start.)

Is that normal? Or a carb setting issue? Or something else?

Sorry not to have more information, but that's all I know.

Sounds pretty normal to me Tom. I always let mine sit and run for a few seconds before I try to move it.

Ark68SS · Oct 21, 2014

Is this on the initial (cold) start, or after it's warmed up? If on cold start, you'll need to hold the choke a little longer 'til there's some heat in the motor. If it's on warm start, you can richen the mixture a little bit by turning the idle air adjusting screw in a little bit.
Also check that the idle transfer passage isn't stopped up. There are two small holes in the body of the carb by the throttle plate. When the plate is closed at idle, the lower passage is blocked off. When the throttle is opened, that passage is opened and brings in more fuel to help the transition between idle and open throttle. If this doesn't work properly, it will create a sudden lean condition that can stall the motor. The workshop manual goes into more detail under the "Idle fuel system" section in the carburetor area.
To see if the passage is clear, remove the carb, unscrew the idle needle and squirt carb cleaner into the idle needle bore. You should see cleaner coming out of both the little holes.
Hope that helps.
BillL

Throttle closed--

Throttle open--

Z-man · Oct 21, 2014

well remember this is a tractor and not a stock car with 100+ fuel octane, and from the 40's and 50's so it not going to have the snap like one would hope, but to answer it sounds normal to me like Jason said I let mine run for a bit in order to warm up and get the oil through the engine before rev up. you will know if you tuned rite cause it should fire on the first turn over and purr like a kitten when warmed up at idle.

Tom Bowman · Oct 21, 2014

Thanks, all.

Sounds like I'm looking for a problem where there ain't one. (I'm pretty good at that.)

Bill, I've only noticed this on cold starts, and I haven't been using the choke at all - may need to this winter, but not yet.

Another Carb Settings Question...

Tom Bowman

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Jason S.

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Ark68SS

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Z-man

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Tom Bowman

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