This is probably too modified for reasonable comparison:
I have a 1000ds bored to 1100 with big valves, sport cams, head-work, modified crank and rods.
Sorting it properly is on my never ending to-do list...
I'd estimate around 110bhp, it was still lifting the front wheel going into 4th at around 110mph
It was running a FIM ECU and I never got round to dyno setup although it appeared to be running quite rich.
It ran like a dream for 1500 miles running in on the road and 8 trackdays, half way through the 9th it started spitting oil through the airbox due to pressurising the crancase. Also judging from the surface of the combustion chambers it runs too hot for long term use. I also encountered an issue with the valve seats on one head which I can't see being related to the crankcase pressurisation issue.
1000ds (992cc) 94 bore x 71.5 stroke, claimed 10:1 compression ratio
992/2 = 496, stock compression ratio of 10:1 gives a combustion chamber volume of 49.6cc
increasing bore to 98mm
1100 (1078cc) = 539 /cylinder
539 / 49.6 = 10.9:1 compression ratio just by virtue of bore increase, any further increase is down to piston crown shape/ head
heads before
heads after
bearing in mind the 41/47mm valves in the after shots (stock is 40/45mm)
piston comparison
Kaemna reckoned this was 11.8:1 although I didn't measure it while putting the motor together
I documented the stupidity here
http://ukmonster.co.uk/monster/showthread.php?t=46630