Why do you get excess smoke from your Yamaha ttr90?

Excess smoke from a Yamaha TTR90 can often be attributed to several factors, such as a worn piston or rings, which allows oil to seep into the combustion chamber. Additionally, using the wrong oil or an oil that is too thick can contribute to increased smoke, as can a dirty air filter that disrupts the air-fuel mixture. Lastly, improper carburetor adjustments may lead to an overly rich fuel mixture, causing excess smoke during operation. Regular maintenance and inspection can help identify and resolve these issues.