hey guys im about to run in my first .21 engine
i just wanted to ask a question regarding the nitro content.

ill be running the engine on 25 - 30% nitro

can i run the engine in on 16% nitro that i normally use with my 1/10 cars ? or is it best to run in the engine with the fuel or gonna race with ?

thanks !

run it in with the fuel you are going to race with . thats the best way thats what i do