Running fine then nothing

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beguz
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Running fine then nothing

Postby beguz » Wed Aug 02, 2017 12:06 pm

So yesterday I used my '49 Cub for 3+ hours mowing 3 fields. Started right up like it always does and ran like a champ the entire time! I was just about finished when I got hung up a little in a tight space. While wiggling it out, it died and would not restart. Not even trying to fire. Checked spark ... good ... and tried a few more times without success. I let it sit overnight in case it was flooded, but this morning still nothing. I checked spark at all 4 plugs -- good. Pulled each plug, cleaned and reset gap to .023 (all were already there or just above); put a couple drops of starter fluid in each cylinder. Still nothing. Any suggestions are appreciated! I want to get it back to the shed!!
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Shane Nelson
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Re: Running fine then nothing

Postby Shane Nelson » Wed Aug 02, 2017 12:11 pm

Did you check the gas tank?
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Re: Running fine then nothing

Postby Eugene » Wed Aug 02, 2017 12:13 pm

Fuel level, fuel flow? Since spark appears fine, that's where I would start.
I have an excuse. CRS.

beguz
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Re: Running fine then nothing

Postby beguz » Wed Aug 02, 2017 12:14 pm

Yes. Should have mentioned that it has plenty of fuel. While it seems unlikely (to me at least :? ), I'll go out to it and check flow.
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Re: Running fine then nothing

Postby tst » Wed Aug 02, 2017 12:29 pm

the spark at the plugs should be blue

beguz
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Re: Running fine then nothing

Postby beguz » Wed Aug 02, 2017 12:51 pm

Well, what can I say? It's back in the shed! I checked fuel flow ... it was good. Still wouldn't fire. Decided to put a shot of starting fluid in the choke. That's all it needed -- It fired right off and ran like usual. I'm a bit embarrassed :oops: that I didn't do that earlier. So, lesson learned. But, if anyone wants to comment, if gas is flowing to carb, why did it need that help (ie, the starting fluid; I imagine a spray of gas would have done just as well). Is this a hint about maybe a minor problem in the carb?
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Shane Nelson
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Re: Running fine then nothing

Postby Shane Nelson » Wed Aug 02, 2017 1:20 pm

Glad you got it going and back in the shed.
Does it have a magneto or a distributor on it?
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beguz
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Re: Running fine then nothing

Postby beguz » Wed Aug 02, 2017 1:30 pm

Magneto
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Re: Running fine then nothing

Postby Jim Becker » Wed Aug 02, 2017 1:38 pm

Possibly a small obstruction in the carburetor that was drawn through when the engine briefly fired up on the starting fluid.

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Re: Running fine then nothing

Postby ScottyD'sdad » Wed Aug 02, 2017 2:29 pm

Jim Becker wrote:Possibly a small obstruction in the carburetor that was drawn through when the engine briefly fired up on the starting fluid.


I was thinking the same as Jim. Happened to me, a few times.
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Re: Running fine then nothing

Postby Matt Kirsch » Wed Aug 02, 2017 2:49 pm

Do you know how and when to use the choke?

The spray of starting fluid in the intake had the same effect as applying the choke to the carburetor, which is to give the engine a rich fuel mixture to help it start. Sometimes you can crank on a cold engine for hours, and a quick blip of choke will have it running instantly.

beguz
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Re: Running fine then nothing

Postby beguz » Wed Aug 02, 2017 3:10 pm

Thanks, Matt, the "quick blip" did the trick. Yes, I know how / when to use the choke – –I've had this Cub for 20 years and always choke it when it's cold and never have to when it's hot. Of course yesterday when the tractor quit it was very hot and didn't need choked. This morning I choked it as I always do when it's cold but, as I said, it wouldn't start until I gave it the starter fluid. I wonder if I had done that yesterday when it was hot if it would have started.

Thanks to everyone who chimed in on this. I'm going to go with Jim Becker's theory – small obstruction in the carb. I'm happy my Cub is happy again!
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Re: Running fine then nothing

Postby ScottyD'sdad » Wed Aug 02, 2017 3:41 pm

Matt Kirsch wrote:Do you know how and when to use the choke?

The spray of starting fluid in the intake had the same effect as applying the choke to the carburetor, which is to give the engine a rich fuel mixture to help it start. Sometimes you can crank on a cold engine for hours, and a quick blip of choke will have it running instantly.

Matt, it is not the same as applying the choke. Choking enriches the fuel, by reducing the air intake. Spraying fuel into the air intake, bypasses the carb, by sending air and fuel, into the engine. If it runs on the spray, then stalls, there's a fuel supply issue, with the carb.
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Shane Nelson
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1993 Ford 4630 W/Loader
1965 John Deere 110
1961 Cub Cadet Original
Circle of Safety: Y
Location: Oak Ridge, N.C.

Re: Running fine then nothing

Postby Shane Nelson » Thu Aug 03, 2017 7:00 am

Matt Kirsch wrote:Do you know how and when to use the choke?

The spray of starting fluid in the intake had the same effect as applying the choke to the carburetor, which is to give the engine a rich fuel mixture to help it start. Sometimes you can crank on a cold engine for hours, and a quick blip of choke will have it running instantly.

Starting fluid is different than gas because it has a lower ignition temperature & it's a completely different mixture than gas, it's not the same as a quick blip of the choke.
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Matt Kirsch
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Re: Running fine then nothing

Postby Matt Kirsch » Thu Aug 03, 2017 7:09 am

Yes, I understand that starting fluid is not gasoline, but it is FUEL.

Both choking and spraying starting fluid enrich the air/fuel mixture entering the engine.


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