I have a new PAW .40 I can't get to idle very well. The high speed needle and compression are set dead on, but the low side is too lean. While at idle the engine misses and then will die. If I take my finger and choke the carburetor for a second ot two, while at idle, the RPMs increase and the engine runs smoothly until the extra fuel is burned off. Any ideas on how to change the low speed fuel mixture?

Thanks,
Carter

The PAW should be an air-bleed carb. a little screw on the side or top that closes off a small hole in the carb, turning it in reduces the amount of air going thru the hole thus
increasing the fuel draw they most often are close if the screw covers half the hole you may need a little more close off. also check and make sure no air leaks on carb mounting
O ring compressed?? I have used a small amount of Koppercoat gasket sealer around O rings then re-inserted carb martin

also engine may still be tight and not broken in fully yet, it might just need more run in time

Before i can answer, have your PAW 40 same carburator as here photo?

Yes, I have the same carburetor as in your picture.

Received the instruction about Varijet from Progress Aero Works when you bought the new PAW 40? If not, save and read this instruction how do adjust Varijet.

Thjnaks motorboy for giving him the right answer I have the old one no a varijet mew one martin

Nice to hear from you,

The Varijet carburator are reliable and easy to use without fiddling with idling of the engine. It is the main needle who are regulate the mixture from full trottle to idle cause the barrel are moving sideways. Inside the carburator has a very small hole to give extra air while the engine are in idle (C in pic). The engine will run with total closed barrel, barrel has small 2 groove to give air passed though the carburator (B in pic).

Very neat solution and nothing to fiddle with except main needle wih they had this few years ago wiuld have saved me the trouble of adapting the intake of mine fo the MVVS carb
but it all worked out good runner I can see this as a great advantage to first time users martin

I tried to fix my idle problem again this afternoon without success. I wonder if my fuel tank could be too low? It is about 1/2 '' lower than the carb. I am going to try a diffrent carb off of my old, worn out PAW. If that dosn't work, I might try to make the air bleed hole smaller to enrichen the air-fuel mixture. Here is a video I shot this afternoon of the engine running.
[link]http://www.rcuvideos.com/item/XNNW20BQBHVB9XFN[/link]

1/2" are too low...

Fuel level in tank during starting procedure MUST NOT BE HIGHER than in the same horizontal plane as jet. A little lower (up to 1cm) is alright. This means that when starting engines in model, especially C/L models, it will be necessary to hold the model in an attitude that this condition is observed, i.e. generally with the tail and outboard wing slightly down, say 10 to 15 degrees.