what i ment buy does it tune well is, that when a motor is old and worn out, it is very hard to tune the carb and will not run reall smooth.. but you said its still good, so scratch that.. if you want to get the most out of your motor, you should invest in a temp gun. they only cost bout $25 here in the states.. the benifit is that you can tune your motor to a tempature and not what it sounds like.. so you can pick a nice worm number like 250* and tune your motor to that temp. youl be able to safly lean it out and still keap an eye on the tempature without smoking any thing.. a leaner motor means more "punch" and higher top speed.. but dont try to do that with out a temp gun.. you can easilly do serious damage.. when you get your temp gun, let me know.. i can give you more details. and you should have that little .12 screaming!!.. if you are planning on getting a hotter motor, you should do your experamenting on the little .12.. so that when you finaly do get a new mill youll be able to tune it well, and it will last a long time. as far as the nitro percentage. its always safer to run the same stuff all the time.. a motor thats not new, will cry like a little baby when changed all the time.. 25% is a hot mix. i run 20% and with my temp gun can easly tune it well..
