Black smoke from exhaust under load

Safety first: Run the generator outdoors or with proper exhaust ducting.

• Replace air filter: Install a new Scheppach air filter element if the old one is dirty or oil‑soaked.
• Check choke: Ensure the choke is fully open once the engine is warm. Repair or replace a sticking choke cable or actuator.
• Inspect injectors (diesel): If black smoke persists, have the injectors tested and serviced. Over‑fueling injectors can cause excessive smoke and soot.
• Turbo inspection: On turbo‑equipped models, check for loose boost hoses and excessive shaft play. Turbo issues require specialist service.