RE: Need YS guru help
most guys I know run either of these 3.......
20/20 cool power (sometimes called YS)
20/20 power master (sometimes called YS)
30% heli cool power
No one I know runs straight 20% or runs 4 stroke fuel. 20/20 is something different than 4 stroke fuel.
I run my YS63 on 20/20 and my YS140L's on 30%