While helpful, only the manual guarantees the specs for your specific engine code (Model 12T802, Type 2173, or similar).
A: Normal if it has sat for weeks. Valve guide seals leak a tiny amount of oil. If smoking continues, perform a compression test (should be 80–100 psi). Briggs And Stratton Intek 206 5.5 Hp Manual
The Intek 206 uses a (air vane) – not mechanical gear. Symptoms of misadjustment (not in manual): While helpful, only the manual guarantees the specs