some leaks only happen when the engine heats up and builds pressure. some of the newer oils don't smoke as much as the older ones. you might only get a poof of smoke at start up. Did you mix sythetic with regular oil that's bad. When it's running & hot check for small leaks. But those little Honda's are just breaking in at 100,000 the run forever.Keep checking.don't over fill it. Good luck.