Oh yeah everything is ok with the engine, it was novarossi plug, c7tc and i also used the p6. I think it went very hot with c7tc because the outside temperature was about 30 C. I have to use colder one. I love Os plugs but could not find it from rc-mushroom. Actually, no problem with speed, accelaration, sound and smoke only it is temperature,so if you say it is acceptable, it is ok. I love this engine it is really very easy to tune,very easy to start; it is a goth that insist to work and give power.