Diesel in itself is a good cleaner, during the Suez crisis I ran my car on the paraffin from street works lamps, had to use petrol to start, then switch over but the white clouds of smoke were horrific and the smell
Stripped carb absolutely mint, cleaned tank filter also mint, adjusted cables improved it, changed plug no improvement, changed oil as I had some.
I will adjust the valve clearances to see if it will run a bit smoother.
Honda publish lots of useful papers for the engines.
It not bad too do when you get it off the ground.
Set valve clearances (if you ever wonder what happens to old coke tins Honda use them for engine covers and stick on with goo).
Sharpened blades as well.
Engine smoother but just not quite good enough for me I will carry on.
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