Bonjour Hans,
Sorry, about the inlet valve, I wished saying that there is no "direct" link between it and the carburetor, the gas does not come from this valve, it just opens while the piston sucks gas so can't push gas through the carburetor.
About the timings, yours seems bizarre for me because mine seems sparkling at top dead center, a bad timing could possibly explain an exhaust valve opened during the compression phase letting a part of the mixture fly through the carburetor.
And about the lever, It was possibly too loose, just after top dead center, mine has a little play of less than 0,5 mm
I also would kindly contact this guy from me,
https://www.youtube.com/@ThomasPCGuruENGINES , he is a great mechanic of these engines and likes sharing with us. Bad luck to meet him, he lives in Australia !
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