I find it hard to believe the fuel tank cap could be causing this noise, but I know there was a recall on the original fuel tank caps and I have a larger black cylindrical cap installed many years ago. I think when I close the choke to keep the engine running it is causing a huge suction or pressure change in the carb /manifold body and that becaseu this only happens after the engine has been running 15-20 minutes the hot metals have expanded and there is a hold in the manifold gasket. I will pull the manifolds tomorrow and inspect, likely replace manifold gasket and look for any hairline cracks. Also replace gasket between carb and manifold.
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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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