ngbninja

Hey guys,

Have recently purchased an os 91 c spec with pump for the hirobo ec-135 but have got warning from some people that the engine will vibrate way too much and will shake the heli to bits, They recomended the YS 91 ST. Which is basically out of stock everywhere.

Just to double check is the engine too rough for this heli?

and does anyone have a YS 91st lying around?

Thanks