RE: OS 70 Surpass Ultimate
The OS FS .70 Ultimate has a "bad rap" for some reason, and it's completely unfounded. This was is outstanding motor for something just like the Seagull Edge 540 (which is, coincidentally, what mine is stuffed into). People who don't don't have the mechanical ability to understand small precision devices like the Ultimate shouldn't expect to be able to master a mechanical jewel like the four-stroke Ultimate .70, let alone maintain it. It was replaced more because of the .82 being larger, I suspect than any clandestine "scheme" as was implied above in another post. Those less mechanical folks should fly electric, or alternatively, get a Super Tigre 2 stroke.... which is comparatively easier to tune, and simple to maintain.