"Then put the crank nut back on up against the clutch puller" NO! Why did you put the crank nut back on? Start again.... Clutch puller plate 3 m5 longish bolt through the clutch puller and around 10mm into the clutch, the puller plate will now be loose and slide up and down the 3 bolts. Now check that the puller plate when you slide it to the top (underside of the 3 socket cap bolts) it hits all 3 at the same time so you are applying equal tension thus not any twist to the clutch which will make it impossible to remove. Final step, ensuring you have the clutch plate centred correctly over the crank arm fit the large m12(?) bolt through the clutch puller and tighten up against the tip of the crank arm and until the puller plate is tight up against the underside of all 3 bolts, if you run out of thread on the large bolt at this point your 3 bolts are too long use the next size down. Ensure the piston stop is fitted and you are good to go, use a ring spanner and start tightening the clutch should 'pop' off. But before all this try another pull starter!? The clutch all 3 'jaws' have an equal gap none have opened. Once you removed the clutch cover would the motor still not pull over WITHOUT the piston stop in place? Try removing the pull starter and see if the motor will turn over by turning the clutch.
If anyone can add to this and or correct me, please do. Process of elimination in karting... Try the cheap stuff first and the expensive stuff last.
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