What should I do if the engine become dead AFTER medium burst of full throttle. For examples, I give full throttle for 2 second acceleration, let go the gas for a corner, exit that corner and full throttle again but.... flame out.

Currently my engine is screaming little bit on the rich side at top speed ( the scream is not high pitch as usual.... little bit rattling sound ).

Is it the compression things ? Is it too rich ? What is probable cause if it still dies after I lean it ? Thx for your inputs !!