Modern Vespa

Hey All I bought a great P200 recently and put a malossi 210 and sip road exhaust. I had it working great, the idle was perfect untill I installed a bgm fast flow fuel tap. Now it doesn't respond to idle screw or mixture screw adjustments and it seems smokier. I dont think its an air leak as it worked fine before the fastflow. I am using a spaco 26/26, any help would be appreciated!

Usually this indicates an air leak that cancels out any value added by adjusting the idle and mix screws. Did you reuse the gaskets on the airbox?

All new gaskets, and like I said it was very responsive before changing out to a fast flow fuel tap. Guess I could give the gaskets a quick check

Put the old fuel tap back in it to verify if what your saying is true. That will at least tell you if it is the fuel valve or not.

May be coincidence. Pull your carb and make sure these is nothing in the idle jet-I use a strand of wire for this. Then clear the idle jet circuit with carb cleaner & air.

After that, then maybe you have something going on besides the carb.