Krokodyl I just dug out a 6ex that I use for buddy boxing the fellows with certain futaba tx's using their cordless buddy system. This seved to confirm to me that the standard eight cell flat pack is indeed removable and just uses a short lead with a futaba J plug. The only thing I can think of is someone glued your pack in which makes no sense to me.

Concerning tunning and running advice You really need to post exactly what make and model engine we are talking about and cannot expect everybody to have read what ever prior posts in other threads.

The tunning method you describe is actually another form break in sometimes referred to as thermal cycling and a I do something similar at times but agine what exactly is your engine? this can make a hugh difference in what advice you receive. As far as needle valve "limiters" and I guess this is what you are talking about, I know only of one OS airplane and perhaps several Evolution airplane engines. Agine in my opinion both were a miserable flop, Why? easy you cannot preset a needle valve or a needle range for every altitude that the engines will be operated at, How is the factory going to know that? They can,t so does your engine have some sort of limiting device on your engine?

On the fuel and its oil content, I have never been a fan of four stroke oil for two stroke or four stroke engines. I would suggest adding a few ounces of caster oil from Sig or even the drug store to your fuel if it as gallon.

John