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I replaced my 2N's manifold last spring. At the time I was sure that I was about to throw a rod since the "tapping" I was hearing was so loud. What had actually happened was that the gasket near exhaust port 4 was worn away and built up exhaust was popping out the opening. Worst yet, the exhaust gasses had worn channels into the block around exhaust port 4. I replaced the manifold, gaskets (block and carburetor), and brass nuts. I used permatex copper sealant around exhaust port 4. The difference is amazing. The tractor runns quietly and the tapping is gone. Parts should be under 80 dollars, if I remember correctly. Replacement is easy. Remove carb and air cleaner tube. Remove generator. Remove tailpipe. Remove manifold. (Note, the studs that hold the manifold go through the block's water jacket, so if the studs start backing out with the nuts, it is a good idea to remove the loose stud and reinstall with sealent meant for such applications). Inspect block - wire brush off rust and debris from block. Then install manifold gasket and manifold. The nuts are suposed to torque to 40 pounds, I believe. Check that with the FO-4 manual. Careful, the brass nuts cross thread easily! At the time I did my replacement I considered myself a novice at tractor repair. The largest engine I had worked on before that was my go-cart when I was 12. It is an easy repair.
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