ZS Piston sticking

[Paul Grafelman <pdgrafelman@vax1.bemidji.msus.edu>]

My Carb piston seems to be sticking for some reason, preventing a smooth
idle and RPMs above about 3500. If I give it a little push upwards with a
screwdriver it pops up and functions properly until I shut of the car. I
looked for burrs etc. that it could be catching on but didnt find any. I've
got 10w-40 in the dashpot and a stock needle. Also, has anyone seen
improvements from a more "open" air filter, like those found on old V8's
(Like a chevy)?

Paul Grafelman
77 Spit "Altair"