Looking for a cylinder head for a KX60 1990. can get a secnond one or, reskim I have. Hoping you can help. Thankks in anticipation.

Without having the car in front of me, it is impossible for me to diagnose what your issue is, but it sounds to me like it is either not properly timed, or possibly not running on all 4 cylinders.

4 cylinder would be the head gasket is blown. 6 cylinder could be the head gasket or intake manifold gasket. The only other way is a cracked head or block. These don't happen to often. If it is the head gasket, send the heads to e checked for cracks and to be surfaced flat.

You bought a car with a failed head gasket or crack in the block
or cylinder heads,that is why it was gotten rid of

The A/C System probably failed years ago,not related

Stop the oil leak. There are gaskets and seals for wherever it's leaking. Valve cover gaskets or seals on the cover if the plugs are recessed. Is the black stuff oil that gets splattered up there?
Spark plugs can keep firing even with oil around the base, but the cleaner the better. A clean engine runs a whole lot better and cooler than one caked in oil. Just don't try to pressure wash it or you'll have worse problems.
It would help you if you could isolate a non firing cylinder, find the one that's missing, I mean. There is a way to find a miss on a running engine by isolating a cylinder that doesn't drop idle speed when the plug wire to that cylinder is removed. But please have someone do it that has done it before. They will know what spark shock means, and how to avoid or mitigate it, or anticipate it-lol. Thatsa lotta voltage!
If you pull the spark plugs out, may help you find the bad cylinder: one will look quite different, may be all black and soot covered on the bottom that is inside the cylinder. Good firing spark plugs will have a tan or brown appearance down at the bottom, with very little deposits on them. (and if black and oily looking and wet, you have likely worn piston rings letting oil burn in there.) So if you could find the miss, it will help you a lot. Maybe you need a tune-up, after looking at your plugs-are they worn down real bad?
Lots of causes for a miss: ignition (plugs, wires, rotor, distributor cap, coil even), gas related (if multiport injection, possibly an injector problem) , and also an internal mechanical problem affecting that cylinder (like a bad sealing valve, a head gasket leak: do a compression test to check for that).
I hope I have helped you in some small way. Good luck.

Remove the spark plug of cylinder No. 3 and inspect it for any water or coolant traces on it. If water droplets are found, the gasket is at fault and need replacement. If not, the gasket is fine and does not need any replacement. It is recommended to check the valve clearance before entering into major repair.

black smoke - oil in the cylinders

White smoke - water in the wrong area - probably a head gasket.

The head gasket is what I am hoping for because it is cheaper to do. And most instructions manuals from an autoparts store has step by step instructions.

If it is oil then you are looking at rebuilding or replacing your engine.

Take a look at both the oil and antifreeze to check for cross contamination which would verify the blown head gasket.

Step 1: 50-55 ft. lbs. (68-75 Nm) Step 2: 60-65 ft. lbs. (81-88 Nm) Step 3: 70-85 ft. lbs. (95-115 Nm) Order Order (front to back) Pass side 11 7 3 2 6 10 14 13 9 5 1 4 8 12 Drivers side

If it is the 4.0 engine there have always been bad to have a cracked head,right between the valves in one of the cylinders.

Oil in the radiator means either a blown head gasket, cracked cylinder head, or cracked block. You need to have this checked out immediately, as you will ruin your engine running it this way.

Cylinder numbering for your engine is 1-3-5-7 on the left hand bank and 2-4-6-8 on the right hand bank (passenger side). To be sure where number 1 is look across the cylinder heads number 1 cylinder is always the head that is furthest ahead towards the front of the vehiclek, then count 3 cylinders back on that side, should be left, and that should be number 5. pull the spark plug first and check it and at the same time pull number 3 's plug and swap the coils from 5 to 3. If the plugs are bad replace them all. Then run the vehicle and see if the misfire code followed the coil to number 3, if it does you know you have a bad coil, they usually run about 90 - 100 bucks each, that is if the plugs or wire wasn't the problem. hope this will help you. good luck.