Quick crash course in Carb adjustment

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   Give me a quick crash course on how to adjust a Marvel Schebler.Just took mine apart,cleaned,replaced the gaskets,Idle needle,Float needle and seat.How do I set the valve on the bottom?The idle is pretty easy.Turn till it sputters then back off a little till it runs good.Atleast that is how I was told.But the bottom one I don't know about.Gotta figure out how to fix the throttle screw.Some numb nuts screwed it in all the way and jammed it and the spring tight.The stop was missing and I made a new one out of a roll pin.Now the butter fly doesn't close all the way.

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Freighttrain Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 04 Jul 2011 Location: Gadsden,Al Points: 390	Post Options Post Reply Quote Freighttrain Report Post Thanks(0) Quote Reply Topic: Quick crash course in Carb adjustment Posted: 15 Aug 2011 at 9:33pm
	Give me a quick crash course on how to adjust a Marvel Schebler.Just took mine apart,cleaned,replaced the gaskets,Idle needle,Float needle and seat.How do I set the valve on the bottom?The idle is pretty easy.Turn till it sputters then back off a little till it runs good.Atleast that is how I was told.But the bottom one I don't know about.Gotta figure out how to fix the throttle screw.Some numb nuts screwed it in all the way and jammed it and the spring tight.The stop was missing and I made a new one out of a roll pin.Now the butter fly doesn't close all the way.

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Jim Hancock Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 11 Sep 2009 Location: EL Reno, Ok. Points: 1112	Post Options Post Reply Quote Jim Hancock Report Post Thanks(0) Quote Reply Posted: 17 Aug 2011 at 11:04am
	Hi FT. The bottom screw is the load screw. You adjust it with the throttle wide open from what I had been told a many moon ago. If I'm mistaken, I can be corrected, but I don't think that I'm wrong. The needle screw is for the gas mixture when a load hits the engine. Think of it as the high speed adjustment. Screw it in to bottom and back it out about 2 turns and go from there on wide open. Shouldn't be off much. HTH. Have a good week.