right, doctor....
but i have many engine that you can tune forever, there is no solution...
if you lean the idle needle, you will have a good mid range, but you ll be to lean on full throttle.... you can then open the main needle as much as you want, there will be no effect as a low needle setting restrict the hight needle setting on the low side...
no matter the glow plug you use....
i ve read a french specialist article about nitro on glow engine...
it states that nitro permits a better combustion , especially on mid range, when the plug tends to cold quicker...
i ve a new rossi , a yamada 60 fr i ve never been able to tune..... and i m not a newcomer....
since i ve mix 20per cent nitro in theire fuel, they run great, at any rpm, and are easy to tune....
for sure, i m the only one in the world to say that, and the mid range problem is a mith for specialist.....and a reality for idiots like me....
this is written by me for what is worth...