Sorry about the presumptions.The stamp is the truth. Older model I guess with sleeker thinner blades.The late model Quicksilver Black Diamond QA2034X or Merc Black Max 48-77342A45 is 13-3/4 x 15. Bigger, rounder semi-cleaver blade. More lift, better push. Likely serve your 2 stroke well, even if you drop 200 rpm, I think you'll find economy gains at cruise and lower planing speed. You can find them on eby for $80 without hub and maybe $110 with. See if a friend or propshop has one laying around. they are very common. Dang good prop for the money. Your Yammy sounds very strong and might be able to spin up the 17p version, but I think you will lose overall going to 19 pitch as the wheel and blade area get smaller.
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