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Show Parts for Model:

37A back fire

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10-27-2012 18:42:21

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I ran out of gas last weekend so I pulled it into the shed with my 4 wheeler and just left it.Today I put new gas in it and it started right up.I let it warm up about 10 minutes before I got on it.I put it in gear and started to drive it but after about 20 yards it started to die.I opened the throdle up to try to keep it running and then it started popping back through the carb.When it died some smoke came out the air stack.I let it sit for a few minutes before I tried to start it again.I hand cranked it and it started right up.I backed it up into the shed and let it run for about 10 minutes before I shut it off.It ran fine after a restarted it.It ran fine before I ran it out of gas.It has a rebuilt carb,new wires,points ,plugs and condencer.Im wondering if i got some water in the new gas.The tank was empty because i shined a flashlight in it to check it out before i put the new gas in.Any ideas? Bad gas or maybe spark jumping in the mag?

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10-29-2012 16:27:38

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 Re: 37A back fire in reply to pbb, 10-27-2012 18:42:21  
Intake manifold leaks and/or weak valve springs. 75 yr old springs could have lost some pressure by now.

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10-29-2012 14:52:21

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 Re: 37A back fire in reply to pbb, 10-27-2012 18:42:21  
This coming weekend in going to check the sediment bowl inlet in the tank. It stoped up once before when a peice of rubber from the gas cap fell down and got in the inlet to the sediment bowl.I bet it cloged again.I looked on Stieners site they got a strainer that goes on the top of the sediment inlet in the tank to keep thash out of the sediment bowl.Im going to get me one.Thanks.

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10-28-2012 19:04:17

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 Re: 37A back fire in reply to pbb, 10-27-2012 18:42:21  
I would say there is a flake of debris stuck in the very top of the sediment bulb casting where it protrudes up into the tank. Sediment bulbs work pretty efficiently along with the screen in the carb inlet in keeping sediment out of carb. Most all carb problems are caused by rust from within the carb itself.You have an intermittent lean out going on. I had same thing on my '37 A and I blew air up the fuel line while having a buddy hold his hand over fuel tank filler hole to feel for air. Particle came out so fast it stung his hand which meant it was wedged in there. Run fine ever after. Like my late Dad said , 99% of the time it is the "SIMPLE" thing. Let us know what you find. RB

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10-28-2012 17:26:13

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 Re: 37A back fire in reply to pbb, 10-27-2012 18:42:21  
If the mixture settings are a little "Lean", sometimes when you apply a load, the engine goes too Lean and the "Fire goes out".(the engine quits).

Have you tried pulling the choke on for a second or two, when the engine tries to die..? You may need to open the "Power" (Load) adjustment a couple clicks..


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10-28-2012 06:36:31

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 Re: 37A back fire in reply to pbb, 10-27-2012 18:42:21  
something in the carb

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10-28-2012 04:45:55

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 Re: 37A back fire in reply to pbb, 10-27-2012 18:42:21  
My first guess would be that when it ran out of gas it sucked some dirt or rust in to the filters and it is now preventing the carb from getting the proper amount of gas. Open the drain in the bottom of the carb and see if it will flow a pencil size stream for a few minutes. If not start cleaning filter screens. There is one in the top of the fuel sediment bowl, and one above the fuel float needle. If that don,t work get back to us. Have fun.

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