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Re: Who's got a yamaha 621?
Posted: Sat Apr 20, 2013 10:32 pm
by cjk
My ycb621 CC has a 4th valve which is larger than 1 through 3. The first three are .680something and the fourth .728 inches. It looks like the 621 piston block is a modified version from the 321 Eb. I'd bet that 321 Eb pistons and 621 pistons are identical.
Re: Who's got a yamaha 621?
Posted: Sun Apr 21, 2013 10:44 am
by jeopardymaster
Not quite on point, but I've never done a side-by-side-side comparison of the 621 in CC, BBb and F and the 103. (I'm not a Yamaha fancier, sorry - just asking.) Are they all essentially the same bugle? Or maybe does the 621 in F match the 103 and the 621 in BBb/CC use a larger one? I suspect the latter.