It is possible u r having a jet valve issue. they are adjustable so a check is in order.

Also the valve guide seals if old and high mileage will allow oil to seep into the cylinders and cause temporary blue smoke as it is burnt out then clears up. I had a similar experience once and that was my problem and solution.

I replaced mine with viton type and have not had any issues for years. Hope this helps. Good Luck.