I am building a BVM F16 and will use a Cheeta 160 SE. I will use 1 smoke tank as extra fuel and plumb the system to run in series. Is the supplied pickup and tubing large enough to do this or should I upgrade to larger ID fuel system?

I removed the smoke tanks on mine, never looked at the internals. You will want to check the pickups on the mains, mine were way too short.

Never mind. Drilled everything our and upgraded to 3/16 pickups and tubing.

That's what I plan to do when my F-18 shows up. I have 3/16 ID clunks and fittings on my Jet Tech tanks in my Flashe's, I cant ever see myself going smaller. That 3/16 ID Tygon looked HUGE the first time I saw it! Fueling is so much nicer with that big line when you have multiple tanks. On the Flashes, my only choke points are the few spots I needed to use 3/16 tubing since that is 3/16 OD while all the other fittings are 3/16ID.