If anyone is interested, The YS 61 ST engine is the greatest engine ever
made for 60 size RC Helis!! I had a OS61SX-WC in my Ergo and it was giving
me major problems when I was doing any inverted hovering and the main tank
dropped to 1/4 full. Not to mention the fact that it never ran smoth and i
would allways notice some hammering from the engine. I then replaced it
with the new YS and i cannot be happier. It has unbelivable power, is
increadably smooth and will never run different (rich or lean) when inverted
due to the pressurized fuel system. I think that anyone buying a new engine
for there heli or considering an upgrade should buy the YS 61 ST right away.
it is the greatest engine ever.
PS.. I broke the engine in in the heli and was doing 3D after two tanks.