Carby my carb issues

My bike dies at high rpm at 30mph it starts 4 stroking running rich with the jet as long as i don't crank it over 30mph it runs fine but when i do get over 35mph it starts leaning out and runs really good since i am running a 42 tooth id blow the motor up if i went any faster
 
I always try the easy stuff first, drop needle leaner and drop float level leaner
 
bending prongs down on NT-style carbs

you should read up on carbs for a while here
 
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