1935 jda fire out of straight pipe

jda1935 · Apr 24, 2011

1935 jd a with a dltx 24 carb on it has fire out the exhaust when running and ocassional backfire is this normal?

Husker44A · Apr 24, 2011

No this is not normall. Carb set too lean,or timing off...Does it start easy ? This is a hand-start. When starting does the flywheel kickback ? I would clean carb first. Then start the tractor let it get to operating temp then at WIDE OPEN THROTTLE. adjust the IDLE screw 1-1/4-2 turns out. Then adjust the LOAD needle 3/4-1 turn out and make sure the float is set correctly. By turning the float bowl up-side down and measureing or guestamating on 1/2 inch from top of float to gasket mating surface. If any one of the needles make the tractor start to backfire while trying to turn one screw in a time the other passage is still plugged. So, if you start turning the IDLE needle in and it starts to miss,back-fire then it is the LOAD passage that is still plugged somewhere. Same as for the Load needle, if you turn that needle in and the same happens then the IDLE passage is still plugged somewhere. I would also change plugs Autolite 3116 are good plugs. Med-hot range..Good luck

BushogPapa · Apr 24, 2011

Mine do that, when I am running down a good hill..!!

Ron..

nh8260 · Apr 24, 2011

might check your valves to make sure they are not too tight

Resting Relics 1 · Apr 25, 2011

JDA 35,
I"ve even had my old A&B do that with a nearly fouled spark plug.
John

Paul from MI · Apr 25, 2011

None of my 2 cylinders(A,B,D,&H) backfire at any time. When not under load some slight irregular firing is pretty normal, but should smooth right out under even a light load. I suspect that your mixture is pretty lean or you have a valve sticking or mis-adjusted. Visible flame out of a straight exhaust when under a heavy load at night is a beautiful sight! I've spent many an hour plowing watching that.

jda1935 · Apr 25, 2011

thanks for the advice. i checked the timing it is right on i think it is the carb. when it is running half throttle it runs a little rough with some flame out the pipe but as soon as you engage the clutch it responds good. i checked the adjustment of the carburetor the idle and load screws are both turned out 3-1/2 turns and the tractor doesnt smoke one bit. would it make a difference on the carb settings if there was no oil in the air cleaner allowing it to get air easier? the previous owner removed the oil for tractor pulling.

1935 jda fire out of straight pipe

jda1935

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Husker44A

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BushogPapa

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nh8260

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Resting Relics 1

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Paul from MI

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jda1935

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