I would like to see some close up pics of the business ends of the spark plugs. Very possible a re-tune of the carburetor, careful evaluation of the ignition will clean up the situation. Carburetor float may be absorbing gas and making it run rich. So many possibilities. Does it smoke blue under any driving conditions? Are you ever adding oil to the crankcase? If it's not using oil, the situation is tune related. I can't imagine given the care you take of it that engine work should be needed at only 28K miles. 128K, maybe.
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