Hello greens_tuf
That's unfortunate - that there was no resolution.

I sprayed a small amount down the air intake hose, which didn't do anything, so I sprayed a small amount in the carb where the air intake connects, also did nothing.

I guess you went through every check - including whether the
crankcase seals were affecting the scavenge of fuel; and you would
have tried a different spark plug... and ...

This is a great project - love the images!
Please let us know what is the outcome.

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Jack