Originally posted by rodrigo1508
Well since no one answers my question in the engine forum although it has 53 views I will ask you guys.
"I normally use 30% from powermaster because thats what my LHS carries but now they got some 40% odonnel and I already bought it so what can I expect from going from 30% to 40%. Also how good is this engine I am planning on using it in my new NRS-RR12L5. Or should I stick with the 30% I havent opened it yet so I can always change it."
I would personally stick with what you have. There is no major power gain from going to 40% from 30%. On top of that you would have to treat your engine like a brand new motor for a few tanks until the engine settles itself down on the new mixture. Not doing this can seriously affect the performance of your engine permanently.