1993 750ss xi newbie here

Basically you drill the carbs mid-range port (hole) to 1mm(.039") with
a #61 drill bit. More info here:
Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

There are other jetting techniques to increase the power too.

Tightening the squish machines (removes some material) the top of the
cylinder to decrease the clearance between the piston and cylinder head.
You can raise the compression about 10psi, increase acceleration and
prevent detonation. Generally .040" (1mm) squish is good, but there is
room for a little more ~.035" or so.

I mentioned trailer bearings because in late spring/early summer it is
common to see pwc's on a trailer abandoned on the side of the road
because they had rusted wheel bearings that came apart on the way
to a lake or river.


Bill M.

If necessary rebuild carbs with Japanese, not Chinese rebuild kits.