[slob]

Hi Murray, I assume you mean 'NOT cracked the float bowl'
Perhaps the needle valves aren't sealing, either worn or some crud in there. Same possible with the seal on the drain screw.
Also check that the floats aren't damaged, if there's a hole in one it won't float. Either that or try setting the floats a little lower.

edit: rather unhelpfully, my 900 manual has no languages other than Italian around the float bowl section, it's in four languages everywhere else, although I'm fairly sure float height isn't mentioned as my Italian is passable as long as no-one is speaking fast at me.

Presumably after ~10 revs the compression has stopped rising?
Try putting a little oil in the bores before re-running the compression test, if the compression comes up, it's rings/bores, if not you need to look at valves: first clearances, then seats.