Hi Steven, According the the Piano Action Handbook (PTG Foundation Press), the specs for both are the same. Key Height: 65.5mm Sharp Height: 12mm Hammer Blow: 47.5mm Hammer Let Off 3-2mm Key Dip: 10mm Back Check Distance: 16-15mm Drop: LO+2mm All the best! Floyd Gadd Manitoba Chapter Hello list, I am beginning to practice my regulation skills on an action model I recieved. Moving forward in preperation for exams in the future. Could anyone provide me with the regulation specs (key height, dip, blow distance, letoff, etc.) for a Yamaha C3. And a Yamaha G2. Thanks so much, Steven Hopp
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