1200 / B-210 Carburetor Warping Issues

When these poor little zinc/pot metal units get rebuilt time after time, the bolts WARP the mating surfaces causing air-inleakage.

Remove all things sticking up, and using a piece of glass, or hone-block, get some 800grit or so Lapping Compound and do "Figure Eights" till the surfaces are smooth.

Before honing, lightly tap the parts to get them close.

Finish off with a HOT CAUSTIC bath, Clean HOT water, and rebuild.

BTW, the "Failed" carb rebuilds that entail white crud in the bottom of the float bowl can be attributed to calcium buildup.

To remove, use a High PH Caustic [Danger-Eye-Skin-pet-hazard]to melt out the crud. "Liquid Fire" is the best I've found, but Red-Devil Lye diluted in COLD WATER will work.

BTW, to dispose, dilute 20-1 in cold water and flush down the toilet.
It's the same stuff as Draino,
[except Draino has aluminum producing Hydrogen gas and is NOT what you want to use in the carb job.]

Rusty Wrench