I agree with GX150- the quickest thing to make a motor powerless is a leaking intake or a dirty carb. Generally carbs don't get shot! they just get blockages that prevent optimum performance. CDI's seldom fade out,(they work or they don't), now coils can have reduced performance when hot- check your spark to see if it's bright blue. Did you check the rollers/sliders in the variator when you changed the clutch & spring?Have you viewed the CVT with the cover off (wheels elevated) just to verify everything is working properly. A variator with wore out rollers won't close all the way.
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