Reply to "Weber tuning frustration"

Today I was on Panonia Ring .
After about 18 mins on the track the engine lost a lot of power. So I make 2 slow turns and after that the power come back.
I do not know what this was.
The engine sounds ok.
No smoke at the exhausts or at the breathers.
Maybe a to lean air mixture ?
At full throttle the engine runns normaly great also at half.
But when I go back from full throttle to idle in race conditions I have a lot of backshouts in the exhaust system.
Is this normal ?
Thanks
Peter

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