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cb 750 smoke

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robbos cb:
Hi good morning i have just purchased a cb750 k3 1973 and i have noticed that it is emitting smoke when revved to about 1500 rpm,
am i in for a major strip or is there another problem.
Just a heads up on this bike it has stood for four years so i have changed the oil and filter changed plugs and added a fuel boost .
Any ideas, please :( 

Speed:
what colour is the smoke

Nurse Julie:
Could be a stuck piston ring/s.

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