What does this konb do? (Johnson GT10)

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I got the lend of a Johnson GT 10 to use for the weekends, but she won't run. When I pull her, it runs for about 10 seconds and cuts out.

I think it may have to do with the knob in the picture below. I'm guessing its the air/fuel mix because its goign into the carb? Can anyone confirm this? Also, does anyone know the setting that this should be at?

Thanks guys!

 

[OBJ]

Re: What does this konb do? (Johnson GT10)

If it setting right in front and says lean/rich, that's the low speed idle adjust knob. Rough setting is 1 1/2 turns out from GENTLY seated.

Your pic didn't show up alt....

 

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Re: What does this konb do? (Johnson GT10)

Sorry here is the picture!

 

[OBJ]

Re: What does this konb do? (Johnson GT10)

Yep....lean/rich idle knob. As I posted, rough setting is 1 1/2 turns out from gently seated.

 

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Re: What does this konb do? (Johnson GT10)

Thanks for that - I'll give it a shot first thing in the morning!