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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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