An exhaust leak can cause hot exhaust gases to escape and come into contact with the muffler, causing it to glow red. Check for any holes or cracks in the exhaust system and have them repaired as soon as possible.
2. Restricted airflow
A restricted airflow can cause the muffler to become clogged with carbon deposits, which can then catch fire and cause the muffler to glow red. Check the air filter and make sure it is clean, and check the exhaust system for any blockages.
3. Incorrect fuel mixture
An incorrect fuel mixture can cause the engine to run too hot, which can then cause the muffler to glow red. Check the carburetor and make sure it is properly adjusted, and make sure you are using the correct type of fuel.
4. Ignition timing
Incorrect ignition timing can cause the engine to run too hot, which can then cause the muffler to glow red. Check the ignition timing and make sure it is set correctly.
5. Engine failure
In some cases, a muffler that is glowing red can be a sign of engine failure. If you have tried all of the above steps and the muffler is still glowing red, you should take the mower to a qualified repair technician for further diagnosis.
