Fuel starve

Manu said

Yes
That would be bad news as it would mean quite some mechanical work ...how could i check that without major opening ?

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I'd first check if fuel level in the bowl is the problem.
And since it only happens hot, whereas cold the choke is closed using more fuel, but also at fast idle (1600 rpm?).
The thing to do is look in the bowl and see what's there. Then decide on next step.