What I don't understand is why would a properly jetted, healthy engine carbon up in the first place.
That was more a problem back in the good ol days of bad gas, crude fuel delivery, poorly formulated oil, poorly machined engines that consumed oil from the day they were born.
Excess carbon in the combustion chamber is different from gummy valve guides.
And what was the purpose of products like Rislone? Was it to free gummy valve guides, or clean contaminated hydraulic lifters swimming in unfiltered non detergent oil?
All I can think of, especially on an air cooled, possibly clogged fins causing hot spots cooking the oil. Any oil leak will result in dirt packing. Might be worth pulling the top cover and taking a look.
That's also why synthetic oil works so well in air cooled engines, more resistant to turning into sticky tar deposits from hot spots.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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