YS63 all the way. I have 2. One in a Freetyle models Freestyle (Sigma Signs) and one oiled up in a bag in my building room. The latter was in an extreme lite until it was shot down [X(][sm=confused.gif][sm=punching.gif]. For the record I often run the engine on 10% with very little loss in performance and throttle response - so little that it still blows all the competiion away.
Get a YS.

Neil