Hmmmmm a few more questions......
1. Is your fuel fresh..... and what percent Nitro is it??
2. What type glow driver are you using??
A. And do you leave it on the plug while running it up to full rpm and then back to Idle??
a, This eats up any excess glow fuel in the crankcase and brings things to " normal"...
3. Are you sure you have NO air leaks at the carburator connection???
4. I see an add on carburator screen, is it perfectly clean??
5. Your opening in the throat of the carb, does it completely close at idle ?? Does it completely open at full rpm??
A. completely closed will obviously be a full choke situation, not good
6. Taking off the pressure line from the muffler ( clean it ) blow into it, Does it seem tight, or are you loosing pressure somewhere??
7. Do you ever see bubbles in the fuel lines???
8. have you removed the main needle and blown fuel through from the tank to wash it out??
9. Is your crancase backplate tight and not leaking pressure??
A. Holding thumb over venture opening and flipping prop over and removing thumb and flipping it over ( throttle wide open) Is there a big difference in the way the compression sounds, if not you have a backplate loose or leaking.....
10. Your 100% land/dirt craft is prone to take in a lot more dirt than an airplane, is your carb clean???
11. Your air screw ( for low idle) may be out too far try 2/3 at least closed, see #5 above....
12. try loosening the tank and raising it up while trying to run engine....
Remember a couple little things will mess up the whole scheme of things... I allways go for high throttle settings with the main needle and then go for the low settings, allways remember that time between settings and runnings changes as excess raw fuel is used up back to "normal" inside the crankcase....... I hope some of this helps........ let me know... Captn Crash...