I have two of these engines and like them very much, I think I got more than I paid for when I bought these engines. As to your questions, 1. They are very easy to adjust, just set the hi-speed needle a little rich of max RPM and adjust the lo-speed needle for a good transition from idle. 2. I ran about two tanks through mine before flying (about 32 Oz.). 3. Yes they run just like a 2-stroke 120 (which they are). 4. I have no idea what an inside explosion box is (maybe a muffler)?
I run mine on 5% nitro fuel and an OS 'F' glow plug. they start easy, run fine, and never quit until you shut them off. [8D][8D].........RJ