My efforts go mostly into the mechanical side (to avoid calling friends with trailers), but I'll try harder than usual to make things look good.
I started with the brakes, which is my habit, just to make sure she's safe if it ever rolls at speed.The rubber brake lines certainly need replacement and those little friction pads in the front calipers don't have much "meat" left.
Those are some crusty calipers, even worse than mine were. All of the pistons were gouged on my 77' KZ 1000B1 LTD and we got stainless steel caliper pistons for all 3 calipers from brakecrafters.com. My bike is an early 77' #500442 and with the help of them we figured out that my bike has the same rear brake caliper and mount as the KZ 750. It's original as far as I know since the bike has been in the family since new.
The Rust Bros. Garage Collection
1974 Honda CB550 K0
1975 Honda CB400F Super Sport
1977 Kawasaki KZ1000 LTD
1979 Honda CB750F Super Sport
1980 Suzuki GS1100E
1982 Honda CB900F Super Sport
1983 Honda CB1100F
1984 Honda Sabre 700
1984 Honda Interceptor 1000
I cleaned up the head tube a bit and think the manufacturing date of 4 77 is visible on the side opposite the serial number, so you guys were quite right about 1977.
Here's the rear sprocket, which looks like an aftermarket JT one with a count of 41 teeth. Do you think this will be good gearing? I live in flatlands with lots of "nice" straightaways!!
And I rebuilt the rear caliper and everything looked pretty good, so lots of cleaning but no new parts. With the exception of a bleeder valve repair insert which uses a 1/8" pipe thread brass insert. Hard to buy these now due to liability.
With my 18" wheel I ran 16//35 for HWY and 15/35 for short rides. When I switched to a 16" alloy wheel I'm running 15/33 and will switch to a16 tooth countershaft sprocket for long rides. Drops the RPM's at 70 MPH to around 4500 where the 15 is at 5000. Lose a bit on takeoff but smoother at speed.
from the JT sprockets website it looks like your sprocket JTR488-41 is for a 530 chain.
If indeed so then a PO probably did the conversion from 630 to 530 chain and sprockets. I'd suggest you count the teeth on your front sprocket and then divide the rear 41 by the front # which will give you the gear ratio which you can compare to Steve's #s
To convert 630 numbers to 530 numbers divide the 630 #s by 5 and multiply by 6.
Thus a 630 34T rear sprocket becomes 34/5 x 6 = 40.8 or 41T to the nearest whole # for a 530 chain
and then of course your rear wheel diameter will matter also.