New Scooter Idle Question

[Gene563]

Hi everyone,
I'm relatively new here, I've posted a couple times, but this is my first thread.
I recently bought a TaoTao, Lancer 150 from KillerMotorSports; it arrived last Wednesday and I have done the PDI. It started up fine and runs well, but the start up idle is a little questionable.
For instance: Last night I started it up, it fires right up, idles nice and high like it should; about 15 seconds later the idle drops and it's almost stalling.
I adjusted up the set screw, but once it warmed up a bit, it's then above 2000 RPM. I set it back to around 1800 and looked it over, drove it for a bit, and it ran fine.
Is it possible the enricher is cutting out too early? I wouldn't think there is an adjustment for that, though.

Also, during the PDI, I replaced the vacuum lines and ran across a hose that appears to be a drain of some sort ... not the fuel bowl. It comes from this device, which I'm not sure what is (the evap can is gone, along with the vacuum, fuel shut off on the other side).



The 2 big lines run down to the motor, one connects to the bottom of the valve cover, the other is just dangling, looking like a drain line. Last night, I covered it with my finger and I could feel suction, but it didn't make any change in idle. I did disconnect the vac line from that unit and the idle dropped severely until either plugged or replaced.



Any advice is greatly appreciated.

Thanks, Gene