Headlights/mounts are different also, obviously '88-89, '90 and '91-92 are different but '91-92 1100 are flatter and mounting tabs/studs in different locations than 750's (keep in mind since most h/lights you look at will be on a shelf, desk, in a box, etc. The '91-92 750's are more curved and are a bit narrower, if you find a headlight with all tabs/studs remaining consider yourself lucky ! They can be repaired quite easily if you have a airless plastic welder.
Oilcooled swingarms use a brake caliper arm attaching from the caliper mount, where watercooled swingarms use a mounting bracket for the rear brake caliper that fits into a sloted area on the inside of the swingarm, if you switch to a watercooled arm make sure you get the caliper bracket and any axle spacers they have
Engines- 1056 & 1127 external parts (starters, alternators, valve/side covers) are interchangable, but internals are different (duh) - 1127 GSXR cranks are lightened, Katana 1127 cases have more webbing/material around main journals, stroke is also different between GSXR/Katana 1127's (katana I think was 2.232 stroke) like to write more but at work -- will get back
Would be cheaper to gring the 1100 mains down to 750 size.When puting a '91 1100 crank in a '91 750 cases...... the crank journals are a different diameter. The 750 cases need to be line bored and new oil galleies have to be machined. I'm going a different route on the 6speed swap.
This is not correct.IIRC the '89-89 750 head is larger than the 90-91 750 head. The 90-91 head is the same size as the 86-87 head and will not fit the 1127 motors. The 89-90 head will interchange with the 1127. The katana 750 head will work with the 88-89 750 or 1127 also. The bandit 600 head is dimensionally similar to the 86-87 or 91-92 gsxr750 head, but the cam sprocket/guide is different.