i run only 15% in my RBC4, i tryed 25% but it ran crap like it was to rich,
so i thought what is the point of shiming to go higher in nitro, just to keep the engine cooler? it has heaps of power already and is running cool.
a colder plug helps with higher nitro as will dosn't it?
it seemed while it had 25% in it it needed to be leaned up quite a lot, but i was not to keen on doing that because this reduces the engines lub
what do you guys think?