GAS GAS MC 250F 2021 Owner's Manual page 114

17 SERVICE WORK ON THE ENGINE
112
Danger
Danger of poisoning Exhaust gases are toxic and inhaling
them may result in unconsciousness and death.
–
Always make sure there is sufficient ventilation when
running the engine.
–
Use effective exhaust extraction when starting or run-
ning the engine in an enclosed space.
–
Start the engine and check for leaks.