My 82 GPZ/kz750 4 doesn't sound right - # 2 cylinder plug white

Left coil feeds 1 and 4...right coil feeds 2 and 3...as long as you stick to this it doesn't matter which lead goes to which plug. Left coil will have one short lead and one long...short =1...long = 4. Right coil leads will be about even in length...doesn't matter which goes to 2 or 3.
It's a wasted spark system so plugs 1 and 4 fire together...2 and 3 fire together...only 1 cylinder in each pair will be compressed and ready to fire when the spark happens, the other will be empty and coming on to it's inlet stroke...

Cylinder misfire on #2 cylinder,

Takes all to fire a cylinder (Fuel, Spark, Air & Timing) properly. Easiest to check is spark. Pull the plug and look at it. Is it wet and smell like fuel? If so, then swap it with cylinder next to it. If the problem moved, then its the plug. If the misfire is still on Cylinder #2, then swap the plug wire (both ends). If the misfire is still on Cylinder #2, then swap the coil. (see where this is going?) If the plug is dry, then check the fuel injector for operation. Noid light tester or you can get a long screwdriver and stick one end on your ear and the other on the injector - it should make a steady, rhythmic clicking sound if it is functional when car is running. No sound? Replace. Is the plug oily? Check cylinder #2 for compression. No compression or little compression means either head gasket blown or bad/sticking valve (intake or exhaust) = big money to get fixed. Timing on one cylinder is hard to test without correct test tools. Timing is likely not a problem on a single cylinder misfire. Good luck.

You have 2 coils with 2 spark plug wires each.Coil #1: it has Orange/white and Black/Yellow wires. That coil feeds simultaneously the 2 & 3 cylindersCoil #2: It has Orange/White and White wires. That one is for 1 & 4 cylinders.If you have remove them, it doesn't matter which one goes where as long as the spark plug cables are long enough to reach the spark plug properly.

The clutch is slipping. Get it adjusted or replace it if it is too far gone.

Vote for me if this helps.

Yes it is low compression and can cause problems,may be a valve problem, judging by the sound, check the clearances,
really tight , burnt valve
really loose, stuck valve
No gaskets can cause that, but would generally take quite a few kilometeres.

No

But it will affect how well it idles and reduce your torque due to a lack of back pressure.

jets sound like they are worn blocked or similar. you might have to clean it all again or try fuch's pro fst to clean them up. have you vacuum balanced them?

http://www.manualz.info/

should find the info you need in a manual here
hope this helped

I think this is a simple gravity feed to the carbs. It's possible you require some vacuum from the intact manifold to open the flow. Some Honda Nighthawks are set up that way.