OK so am I correct in understanding that:

1) We don't know of a high comp 'drop in' piston that is available for the XT660 motor?
2) A high comp Lets say (11.5:1) piston could yield anywhere from 1-2 hp though theoretically could be as high as 4.5hp?
3) No one has yet tried just upping the compression on this motor and measuring the results?

Both my Yamaha wr250 and wr450 had 11:8 compression ratios and worked perfectly on 98 octane pump gas. Why wouldn't the XT660 at the same compression or 11.5:1?