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Discussion Forum

MF 50 Carb Adjustment

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Author  [Modern View]

03-22-2011 15:29:17

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I had to replace the carb on my mf 50, but don't know how to adjust it. It is idling fast, runs rough, and smells rich. There's an adjustment about 10 o'clock from the fuel intake, and one on the right side of the carb. It has a big knurl knob on it. Can you tell me what the two are? thanks!

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03-24-2011 14:54:32

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 Re: MF 50 Carb Adjustment in reply to Steve's Fords, 03-22-2011 15:29:17  
Quoting Removed, click Modern View to see

The only bad thing is that on the mf50 the throttle adjustment is on the back side of the carb and you can't get to the adjustment screw - the intake and exhaust manifold and heat shield is in the way!

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03-24-2011 22:33:05

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 Re: MF 50 Carb Adjustment in reply to NebrBob, 03-24-2011 14:54:32  
It the same way on my TO-30!

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03-22-2011 22:19:05

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 Re: MF 50 Carb Adjustment in reply to NebrBob, 03-22-2011 15:29:17  
I"m guessing it"s a Marvel-Schebler carb. The big knob is the power jet and it should be backed out ~1-1/4 turns. The small adjustment on the updraft part of the carb is the Idle air adjustment(unscrewing it leans the mixture) It should be screwed out ~3/4 turn. These are starting points. Start the engine and let it warm up. Adjust the mainjet so the you can accelerate the engine smoothly from low rpm to high rpm. the idle jet should be adjusted to give you the lowest idle speed and then the speed adjustment screw should be used to set your idle speed 400-500 rpm.

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Bob M

03-24-2011 12:58:36

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 Re: MF 50 Carb Adjustment in reply to Jerry/MT, 03-22-2011 22:19:05  
Jerry - Correction to your last sentence: The idle jet should be adjusted to give the FASTEST idle speed. Then reduce the idle to 400 - 500 RPM using the idle speed screw (throttle shaft stop screw).

Often the smoothest idle can be achieved by repeating the idle jet/idle speed adjustment sequence 2 or 3 times.

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