Richard L.

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Go into the engine forum and do a search for this topic. There was a pretty long thread on this. Also read the threads on YS .63S versus Saito .91 and YS .63S versus Saito .82a.

I had two Saito 72's, and I now have two YS 63's. I can tell you one thing: the YS 63 will blow away the Saito 72 in terms of idle, throttle response, and power output.