John,
The Cams that break are caused by a rod breaking them, not on their own.
You can try the other carb, why not? you have done most everything else.
When you done the initial compression check and it was good, I didn't think it was valves but I'm always open to learning.
Is the carb on it now, the adjustable kind?
The one from the KT should be adjustable.
Try it,you might get lucky there and adjust it so it runs fine.
As far as right/left side,it is almost always viewed from the operator position.
Did you check the intake manifold for an obstruction on the R side like a dead mouse or stuff?
At this point we all are grasping @ straws.
And yes, do run another compression test just for a base line.
If the carb swap produces no joy, then remove the muffler and try running it.
somewhere we all are missing something.
Those things run sweet.
Do not give up!!!!!!!
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