My 750 does that too. Before and after a top end rebuild. Sometimes it's as simple as condensation burning off, especially if you park it somewhere cold overnight. Usually mine is gone after a long ride, but not always. Like the last guy said, make sure all your maintenance items are up to date - can chain tension, valve clearance, points (if you have them), timing, oil change etc - if you've still got a bit of smoke I wouldn't worry. Is it white? Blue smoke usually indicates burning oil. Mine is white, water vapour
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