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Sometimes worn chains have loose and tight spots.

Has this been checked with a runout dial to check that the issue is actually the crank?

You could also try removing the oil pump sprocket from the crank and checking that it is properly seated into the disc spring as this can cause misalignment if it is sitting on one side of the spring.

EDIT - thinking further on this I have also noted variations in the sprocket on the oil pump itself. It's just a stamping.

If it were me I'd remove the oil pump gear from the crank and check the crank runout without the gear fitted.

I don't have a dial caliper - which is the tool for the job - but would weld together a jig to bolt to the front cover holes in the case where runout could be checked with a feeler gauge as the motor is rotated.

If the crank is bent it would be a question for a good machine shop if it could be pressed straight. Another would likely be better.

At the back of the motor you should be able to remove the CDI advance cover and at the top of it you may be able to check the rotational clearance of the rotor to the stator at the top. A feeler gauge should reach through the opening above the advancer.
 

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Super Moderator
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OK, I hope then that you can find a crankshaft. We have a number of members in South Africa so there must be a number of CXs there.

It might be best to post an ask in selling and buying stating your location.

Best of luck.
 
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