Could actually be the choke not working right if you have a carb with electric choke.
Otherwise sounds like something in your carb is either out of adjustment or possibly clogged. I would check the pilot jet first.
Also an 80 jet sounds a bit small for that setup, how do your plugs look? Nice and brown, or white?
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2005 Yamaha BWS (Zuma) "Garfield"
TP Black Trophy 70cc, Giannelli Reverse Pipe, 5g Dr. Pulley Sliders, Delta Clutch with Yellow Springs and Yellow Contra, Malossi Torque Controller, Naraku R-Vent Bell, NCY Adjustable Secondary Sliding Sheave, CF Reeds, Kege Analog Tach, Dual Headlight Mod, N.A. Rear Fender Delete, OEM Short Windshield.
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