hey, i have a yamaha dt 125 with a dt200 engine in it. it has all the dt200 parts except a pwk 30 carb and v force membrane. it ran fine for 2 months no issues. but then i put a new piston and the membrane broke off. i bought a new membrane and since i cant get it to run right. it has a bog after 10000rpm. i cant find anything wrong or broken. i checked the resistance in the ignition. its all in spec. does anyone know what it could be?

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