I need to change the clutch on my 1981 Kawasawki KE125

normally you remove t6he transmission to change clutch and pressure plates
is it necessary to replace the clutch plate at all as many slipping clutches can be attributed to faulty hydraulic clutch master cylinders and broken clutch cables
may be if you commented using make , model , type of equipment and symptoms of the problem so that we can get a better idea on how to advise you

jack up engine loosen trans from engine pull trans back to access the clutch assembly remove fly wheel remove clutch pressure plate and replace reassemble be careful

just replace your clutch plates,you can buy themfrom Redline and in respect of your running problems,you need to start with the basics ,I/e plugs first.

the sibe with the kick starter.

Buy a clutch cover gasket. Take clutch cover off, remove 5 bolts and pressure plate, pull each plate out one at a time keeping them in order, replace with new plates, new plates go in same order. Soak the new plates in oil overnight before installing. Clean gasket surfaces completley.

If the vehicle has been standing for some time (6 months or more) without use, the clutch plate facings may be 'stuck' to the flywheel and pressure plate surface.
To check/clear this problem:-
(with the engine not running!)
hold clutch pedal down - then from under vehicle, find an opening in the clutch bellhousing (such as a water drain slot) where you can see/access the edge of the clutch plate (sandwiched between the pressure plate and flywheel).
Use a screwdriver blade (or similar tool) to prise clutch plate free from flywheel face (only small movement is required).
If the above is not the cause of your problem, 1) the clutch throwout mechanism should be examined for problems,
2) the pressure plate is faulty- may need to be replaced.

On the side of the motor where the cable enters there is a plate with 3 screws under that you will see it is right there easy.Just the little plate no need to take engine apart!

First try changing the oil to an inexpensive motorcycle oil.
Run the bike while engaging & disengaging the clutch until the engine is too warm to touch.
Drain the oil & replace with fresh.
See if this flush has improved the clutch performance.