I agree with Stan, I've done it a number of times on a few motors. Dead easy, just make sure you replace anything that looks worn also.
I had a smoke problem too. Turns out that my fuel tank was constantly vented (I have premix) & I was losing fuel to evaporation, but obviously not oil. Smoke sounds like you need to have the oil mixing bits looked at. Could you be running a bit rich?
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Phil - on the good (ish) ship Venus
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