How much does the engine itself of each of these bikes weigh? Yamaha YZF R6 Suzuki GSX 600 Honda CBR600RR?

They are all ~600cc. Kgs would be preferable but its easy enough to convert the weights. I can't find their engine weights anywhere.

R6 - around 54kg.

GSX-600 - around 48kg.

CBR-600 - around 52kg.

(The precise weights vary, depending on the model year and where the bike is being sold)

Why?

What difference does it make?

And also their dimensions as well please.

I've never seen that specification advertised. The whole bike (late model), weighs between 400 and 450 pounds. The motor/transmission is a major part of the bike, so you can probably safely figure around 200 pounds for engine, transmission and packaging.

That's about 91kg