MODEL-AWARE TROUBLESHOOTING
Murray MT100 42 runs rough
Rough running can come from stale fuel, restricted airflow, ignition trouble, or a cylinder-specific problem. This guide is mapped to mower model MYT4213500 and its 31R5 engine configuration.
Make the machine safe firstWork outdoors. Park on level ground, disengage the blades, set the brake, remove the key before touching components, and let hot parts cool. Follow the manufacturer manual. Do not bypass safety switches.
First checks that preserve the evidence
- Note whether the symptom occurs cold, warm, under blade load, or at every engine speed.
- Check for obvious debris around the intake and cooling screen with the engine off and cool.
- Avoid adjusting governor linkages or carburetor screws before the basic checks identify a direction.
Continue with a guided diagnosis
Detayl uses your observations to select the next useful check. Its scoring and test-selection logic remain on the server; this page does not publish the diagnostic graph.
Diagnose this mower