This problem has been around at least since 1970 in a variety of makes and models by all manufacturers. You can obsess about it and try to get all sorts of social media support or just fix it. There are a variety of carbon cleaners that can be squirted/injected into the air intake that will fall on the back of the intake valves and soften the carbon. It will eventually fall off and be ingested into the engine and burned. You can even spray light amounts of water into the air intake, and it may soften and loosen it, but that treatment is primarily for carbon build-up on the tops of pistons vs. backside of valves. Several manufacturers even released walnut shell blasting techniques (BMW) to take the intake manifold off and blast the carbon off the back side of the valves. Welcome to the world of environmentally responsible clean engines.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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