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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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