OB motor experts ?

[J.Dillon]

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Shown above image is the underside of the Mighty Mite 2 hp motor series 800.

I have great difficulty starting this motor. No manual is currently available .

It requires direct squirt of raw gas into the cylinder. When it finally kicks off it runs for a few seconds and then dies.

If you do get it going it takes full choke to sustain it to run, then switched befores it dies, to the run position.

The controls on the face have a (L to R ) START, CHOKE, RUN, positions.

The thottle and spark advance indicate the setting for shift only.

The key I think to get this motor to start and run properly is to have the initial settings to be set correctly on the carbureator as shown in the image. The prominent screw on on the bottom of the carbureator( what appears to be the float chamber) is for ? and the screw appearing to the left and horizontaly in the image is for what? Any body have any clue as to the initial settings ?

BTW the gas oil ratio for this motor is 25 to 1

JD

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[capt jake]

First off, have you pulled the sediment bowl off and inspected it? I bet the carb will need a cleaning. Usually really easy; most of the ones I have tackled in the past few months only took about 15 minutes to get clean and running.

Once you take off the bowl you will have a better idea what teh 'center' screw is for. It would appear to be for float adjustment, though I have never seen an external adjustment for floats (with a few exception on automotive carbs).

The screw to the left (horizontally) would be for the idle mixture. Some meter air while others meter fueafuely guess on this one is that it meters fuel. I would lightly run the screw in until is seats (lightly!) then back it out about 1 1/2 turns.

I would bet the problem is in the cleanliness of the fuel system though. It doesn't take much contamination for these to be problematic.