- Fuel mixture: The fuel mixture may be too rich, which can cause the engine to run rough and produce excessive smoke. Check the fuel mixture ratio according to the manufacturer's specifications.
- Air filter: A dirty or clogged air filter can restrict airflow to the engine, causing it to run rich and bog down. Clean or replace the air filter if it is dirty.
- Spark plug: A worn or fouled spark plug can cause the engine to misfire and run inefficiently, leading to bogging down and smoking. Check the spark plug and replace it if it is worn or damaged.
- Carburetor: The carburetor may be dirty or clogged, causing the fuel mixture to be incorrect and leading to bogging down and smoking. Clean or rebuild the carburetor if it is dirty or clogged.
- Compression: Low compression can cause the engine to run inefficiently and produce excessive smoke. Check the compression and repair or replace any damaged components if necessary.
- Exhaust system: A blocked or restricted exhaust system can cause the engine to run poorly and produce excessive smoke. Check the exhaust system for any blockages or restrictions and clean or repair it if necessary.
If you cannot resolve the problem yourself, it is recommended to take your Yamaha Blaster to an authorised Yamaha dealer or mechanic for further diagnosis and repair.
