Yes, thanks for the info.  </p>

I too think a 20" prop is just too much, and a 6" pitch is just too little.  Max power occurs at 7000 rpms according to Honda, and I would recommend propping for about that.  Mine turns an 18 x 8 just shy of 7000.  It is converted to CDI ignition and a larger WT carb; open exhaust stack.  When I tried a larger prop the engine "fell on it's face".</p>

AV8TOR</p>