The only way I could get my old 105 combine with a 4020 gas engine to not load up was to plug the passageway to the vacuum operated accelerator pump piston. The fuel economy went up too. The vacuum piston has no seals and gas starts sucking past it. There is gas on one side and manifold vacuum on the other side. Downfall to this is I had to open the throttle very slow or it just sat there and popped through the carb when I opened the throttle. Worked OK on a combine, won't work for a tractor where the load is varied so often.
I just read where Roberts Carb claims to have helped with this on the cast carbs. They claim all it takes is some machining and a viton seal. I wonder if they aren't talking about this accelerator pump piston. They claim Zenith has agreed to make the changes and manufacture them.
I forget if the 105 had aluminum or cast, I'll have to run down to the machine shed to have a look at the engine some day. I have a hunch it is cast.
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Today's Featured Article - Adding an Hour Meter - by Steven Gussey. This article tells how I added an electric hour meter to my 1942 Farmall H after rebuilding it. I wanted to keep an accurate maintenance schedule for my rebuilt engine and the implements I use with my tractor, but the H was never available with a tach
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