need guidance on carbs

The bike runs good now but on higher rpms it cuts out. Should I jet it to 155? Or install a short exhaust pipe for better back pressure?
 
If you have the components on hand to create some back pressure I might try that first, but jetting it up a size should do it if its lean at WOT, may also need to lower the needle a notch too after upping the main jet.
 
I added a small 6 in pipe with small tip exhaust. Seem like it's running better. Rpm at 7/8 and max speed is at 60/70. I'm going to get it welded on and see if I need to rejet. Will keep this thread posted. Any help and knowledge welcome.
 
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