After being left standing for a while in the garage, when I start the bike I get a lot of smoke out the exhaust for about a minute, then it's all gone. After the smoke has gone, the engine is rattle free and running really smoothly.
Is the most likely cause worn valve guides and the oil is slowly seeping onto the valves and/or top of the piston? Any other potential causes? Any thoughts or comments much appreciated, including best ways to fix it!
Thanks in advance, Bob.