Expanding on this a bit. This engine is a "dry sump" engine. It is not exactly dry but the bulk of the oil is external to the engine in a tank or in the frame depending on the model. The engine has a flow back check valve that is supposed to stop oil from draining back into the sump when not running. This valve is not perfect and if the least bit worn or dirty the oil will drain back. Checking oil after sitting for quite a while will always show the oil to be low, never fill it based on this.
As already stated, run the bike for a few minutes around the neighborhood to warm it and get the sump all pumped out of excess oil. Check oil soon after shut down making sure the bike is upright.
The flow back valve is a steel ball and a replaceable rubber sealing surface located at the bottom of the clutch cover case. It is very easy to replace, the rubber seat is all that needs to be replaced as the steel ball is rarely defective. Be sure to have a replacement clutch cover gasket in case the old one tears and they usually do.
This is a recurring theme with new owners. This why I expanded on this for those who come along and read and learn. This is what forums are good for.
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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