Need Help with Model B Carb

Keith True said:
It's been a while since I had a B carb apart.But,I think the throttle shaft can't really be soldered up and filed like the A.I think it has a step,or cut out in it,and a passage in the body that lines up with it.When it is in a certain position it allows fuel to run through it from the passageway that lines up with it.You can't just bush it,because you can't plug up that passage.I can't remember if that passage is for idle,or off idle enrichening.
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The backside usually doesn’t have the wear. It’s the throttle rod side. I’ve soldered mine a couple of times over the years. I bought this military grade gas resistant grease that was mentioned here a while back and use it to lube the shafts.
 
Chuck Sea/Tac said:
The backside usually doesn’t have the wear. It’s the throttle rod side. I’ve soldered mine a couple of times over the years. I bought this military grade gas resistant grease that was mentioned here a while back and use it to lube the shafts.
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Chuck is right. It is usually the front (throttle arm) side that has the wear. Solder it up for a tighter fit as is often done on Model A shafts and be done with it.
 
PRG999 said:
Chuck and Ursus how do you solder up the throttle side?

Paul
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Remove the shaft, clean it well, then measure it with a micrometer. They tend to wear oval, with most wear on the side bearing the most tension from the accelerator spring. Apply flux and butter on a thin coat of solder to the worn side. Use a fine file to shape it to a just-to-tight fit then finish fit it with sand paper.
Or, you can buy a new one from Bratton's for $22.
 
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