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Float Setting on 50

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50man

01-11-2003 04:50:05

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I have a Dual Induction 50 tractor that has had the carburator redone. I noticed after I put it back on the tractor last year, it always puffed some dark smoke at idle. I adjusted the idle screws per the manual but it didn't seem to make a difference. The tractor runs great but just seemed to be running rich. I wondered if too high a float setting would do this so I checked it and it seemed a little high so I lowered it the measurement in my manual. I think it says 3/4 of an inch to the needle boss. Now it doesn't smoke any more but it hesitates when I really hit the throttle. Could I now be starving it for gas? I need some clarification where to measure to and from to get the correct float setting.

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John Van Valkenburgh

01-12-2003 15:40:51

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Re: Float Setting on 50 in reply to 50man, 01-11-2003 04:50:05

I've noticed that my 50 will act up a bit until she gets to at least 140 degrees. After that things are fine. I'd say that the black smoke at idle is way to rich. I adjusted my float to the specs Clooney suggested. No problems after that.

My idle setting is between 600 and 700 rpm. Can't idle lower than 600 because the throttle plates don't quite sit tight enough. Not a problem really since I recall 600 is the factory spec for slow idle anyway.

What sort of thermostat arrangement do you have. My 1953 has the old style radiator shutters. When I got the tractor the shutters were missing. Without the shutters the tractor would never even approach 140 degrees in cold weather. Makes a big difference in overall operation once she warms up. Remember there is something like 7 Gallons of coolant that needs to be heated up in our model 50s. 7 Gallons, I kid you not. It was a surprise to me. I thought the manual had a misprint at first.

Good luck with your 50. I hope you have as much fun with it as I have with mine.

John

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ChuckW

01-11-2003 13:18:28

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Re: Float Setting on 50 in reply to 50man, 01-11-2003 04:50:05

Check and make sure it is the correct carburator. A Dltx 75 is the proper carb for the gas tractor. Have a neighbor had same problem and he has the wrong carb for his tractor.....

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Clooney

01-11-2003 07:44:45

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Re: Float Setting on 50 in reply to 50man, 01-11-2003 04:50:05

50man, how low are you trying to idle the engine? If you are trying to get down under 300 RPM's you will get black smoke if you don't reset the idle mixture screws a little leaner for proper mixture at that low of an RPM. Most 50-530 gasoline tractors with duplex carbs won't meter correctly with the same needle settings at both 600 RPM & 300 RPM. ~I usually just set the top of the float "level", [parallel with the bowl gasket surface] as that is usually pretty close. If you set the float level too low it probably isn't filling the acceleration well high enough & it's running out of fuel in the well & going lean on heavy throttle up. ~You might try turning the manifold heat control to "hot" to add heat to the manifold as that will atomize the fuel a little better at idle. Make sure the engine is reaching proper operating temperature, a cold engine due to a faulty thermostat will not properly burn the fuel at low loads.

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John T

01-11-2003 05:16:14

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Re: Float Setting on 50 in reply to 50man, 01-11-2003 04:50:05

Hey 50 Man, I had a similar problem on a duplex carb and I didnt adjust the float (That may not be your problem?), heres what I did and it cured it. First, I adjusted each idle needle with the opposite sides plug wire removed at slow slow slow idle by turning them in lean just till she sputtered, and then back out open richer 1/4 turn. Then, I had NO black smoke at idle, which I dont believe in, because it blackens the plugs with soot. Then it had that very slight hesitation when I opended the throttle (but not when setting, just when uner a load), so I opened my power jet settign an additional 1/4 turn, and now Im fine and she idles and runs just where I like her with NO BLACK IDLE SMOKE. If your float is set at factory specs and you have her idling clean, have you tried richening the power jet just a tad??? You might also have a restriction in whats used like an "accelerator pump" circuit. That carb doesnt have any accelerator pump, of course, but it has a well of stored gas that gets sucked up when you crack the throttle, and if its not operative, it can cause what you describe. Also, you might want to check your timing, because that can cause some sluggishness if not set correct. Good Luck and let us know how she turns out. Ol John T Nordhoff in Indiana

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