I did check the motor housing for debris while cleaning the flywheel and replacing the coils. Can you replace valve quite seals like on a older car?Smoking at start up can be a sign of overheating causing the oil the thin down too much
When you turn the engine off the thin oil ends up pooling in the combustion chamber and around the rings
Then when you start this oil burns off making the engine smoke for a few minutes
Many times the oil is not actually burning in the engine but in the muffler .
So check the engine for debris build up under the blower housing.
Idleing the engine down before shut off makes this worse .
The motor is an 2006, really doesn’t burn oil as far as smoking while mowing. It just on startups it does this. Figured it was valve guides or I could replace the valve guide seals and help with the skoke.Nearly all Kawasaki engine smoke a little when first cranked up and this includes new engines. Unless the engine is using n usual amount of oil don't worry about it.