Re: Yamaha 115 HP Smoke on start up
Just went thru the repair manual to see if anything done during any HR. inspection or service could be related to an oil bypass problem. Could not find a thing. If the valves were over the combustion chamber, I could understand some oil running down the valve stem and being burned at start up. Even if there was a gallery in the head for oil to accumulate, yours is a very low time engine, valve guides should be like new. Inverted or radial engines can accumulate oil in the combustion chamber thru normal gravity draining down the cylinder wall. That is why in old timey movies you see guys pulling the props thru or pilots counting blades before they turn on the ignition.
Just a side note, as a young man I saw daily planes disappear in clouds of smoke when 4-- 28 cylinder engines were started in the morning. Was 40 weight oil too.
OK, enough of that! Your cylinders are not positioned for residual oil to run past the rings. Some might disagree but I would suggest you not be concerned with a bit of smoke at initial start up. Means the cylinders are lubricated. I think the less wrenches you put on a YAMAHA, the better off you are. Be satisified if the shop can repair your trim cylinder leak.
As for the warning buzzer, mine goes off and stays on momentarily also just like on my vehicles. Being in the sub tropics, I use 20W-50 in everything. Would say the most important thing to look for is to make sure the crankcase is not overfull. regards FRED