Hi Ortwin, it's easy to increase displacement from 920 to 980 cc, as this only involves larger bore pistons.  However, the increase to 1100 cc involves a crankshaft with more stroke, which (I presume anyway) doesn't fit in the 920 crankcase.
Cheers,
Thorsten

The crancase of XV-models 750-1100 is the same with the exeption of the final drive. The crancshaft of the XV1100 should fit the XV920 so if you cange cylinders and crancshaft you should get 1100 cc.
Best regards
Lars

Hi Tomas, what pistons are you using, and did you have to re-sleeve the cylinders and bore the crankcase?
Cheers,
Thorsten

This was written by Lars Sandstrom:
"The crancase of XV-models 750-1100 is the same with the exeption of the final drive. The crancshaft of the XV1100 should fit the XV920 so if you cange cylinders and crancshaft you should get 1100 cc.
Best regards
Lars"
I want to put Virago 1100 crank and top end on my XV920RH.  The above "should fit" I would know if is "definitely will fit."  It would be very expensive for me to buy the `98 Virago 1100 engine I'm considering, only to have it not really fit.  I can do some machining, but don;t want a big design project because they do not really interchange.  The key question has to do with models.  I know the later 750 to 1100 are the same, the question really concerns the very early 920 (1981).
-Chris