Spluttering From 6k Onwards On Carbs

[wardy18 33 1 Cars]

Currently at a quarter mile sprint an not seemin to wanna rev very well!

 

am running twin 45 webers on the 1900, doesn't seem to be pulling that well an as soon as i get to 6k it starts spluttering!

 

also the engine jus doesn't seem to clear until 4k when u rev it hard?

 

Can anyone help, what can it be?

 

im at the event now so i can try anythin

[wardy18 33 1 Cars]

Ok got it sorted, leaned off the mixture, advanced the timing slightly an put the socks back on the carbs trumpets, i think the carbs were gettin a little too much air with the 10mm trumpets i was running!