Why does engine smoke on Suzuki LTZ 400 ATV?

Engine smoke on a Suzuki LTZ 400 ATV can be caused by several issues, such as burning oil due to worn piston rings or valve seals, leading to blue smoke. White smoke may indicate coolant entering the combustion chamber, suggesting a possible head gasket failure. Additionally, excessive fuel can cause black smoke, which may result from a carburetor issue or improper tuning. It's essential to diagnose the specific cause to prevent further engine damage.