few problems....

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Try moving the needle clip down a position or two. Ive had to do this on my last two bikes and has sorted out the problem well.
 
hmm something must be wrong because if it been running fine and started playing up all of a suden its not going to be needle position or jet sizes you might have a blocked jet or a buggerd spark plug have you cleaned air filter might be alot of things but then agin you need to give a beter explanation of what is doing. But i would pull carby off and pull all the jets out and check them first could be **** in fuel but im cass38's M8 and his runs sweet as but when you slam the throttle down from idle it has a big ass flat spot but if you got downnot so fast on throttle its fine
 
Thats exactly what it does when the fuel is about to run out, when you give it full throttle theres not enough fuel so it dies but when you give it a little throttle its ok, check the fuel haha.
 
yeah dont mess with jetting yet, check for crap in the carby (jets, float valve) or kinked fuel lines and anything obvious first
 
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