Hello to all,
The new YS 63S has been announced, but the magazines goofed and printed our ad a month early, catching us a bit offguard with web info. We did not want to announce this engine prematurely, but the mags let the cat out of the bag.
The new engine should be on dealers shelves by the end of April. They are NOT available yet and I don't believe there are any dealers taking orders.

The engine has several new and noteworthy features, the most noticeable being the regulator placement on the left pushrod housing. The YS engineers felt that the former placement of the regulator caused problems in high heat conditions, so it is now in a much cooler place.
The lower crankcase has been strengthened to help prevent distortion during both high air and HP loads.
The cylinder is now "linerless" for better heat transfer, another aid in high heat conditions.
we have been flying prototypes of this engine for several months, and the results have been excellent. YS has made the engine better and more user friendly at no increase in price.

We hope you enjoy running it!!

Good Flying,

Dave