I did have an old 10 hp briggs, flat head. After it warmed up you could see gas molecules when you removed the air filter. Engine would start missing and spark plug would carbon up.
The problem was intake valve seat recession causing the air in carb to run backwards causing a rich condition.
I had to remove the intake valve and grind off some of the valve stem. I had that happen a few times on the old briggs flat head engines.
So if the tractor is running OK, I wouldn't worry. If tractor is missing at an idle I would be checking the valve clearance and compression. Intake valve may be leaking compression back into the intake.
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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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