Hi Zack,

I've just been through the same nightmare as you and this is what I did to rectify it.

I took the carb off the engine and stripped it right down but before I stripped it I tested it for air leaks and found a massive one around the slow running screw. The way I checked for this was to connect a piece of fuel tubing to the fuel nipple on the carb and with my fingers, closed off the intake and bottom end of the carb. Next I connected a large plastic syringe to the fuel tube and put the carb in a bowl of water. When I pressed the syringe the air could be seen coming from around the slow running screw, behind the rubber grommet. I packed this grommet with vaseline (you could use high melting point grease).
I put the carb back on the motor making sure the 'O'ring was in place and in good condition. I also smeared some vaseline around this 'O'ring.
With all the screws in the fully closed position I then began opening them up as follows:

Main screw 2.5 turns out from fully closed

Slow/medium screw 1 turn out from fully closed

Idle screw set for 1.5mm opening in carb barrel.

The car did not start with this combination so I gradually increased the slow/medium screw in one eighth progressive steps and after about three of these increases the engine burst into life and is running very nicely.
I am using a medium plug and 20% nitro fuel. My glow battery is fully charged and gives a very bright glow on the plug.
My next task will be to fine tune the Main screw for optimum performance but the engine needs to be hot to do this properly and the rain beat me to it for today.
I hope that this helps you. The air leak was a real ***** and caused me a lot of hassle, but now I've beat it and the engine is on song. I used the syringe because you cannot generate enough pressure with your mouth/lungs and if you try it this way you will not find the air leak if their is one.

regards,


Chadz [8D]