JCB Over‑Fueling / Incomplete Combustion

Excessive black smoke from exhaust when the generator is under load.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Dirty air filter, Overloaded generator, Faulty injector nozzles, Turbocharger issues (if turbocharged JCB engine)

Safety: Operate in a ventilated area; avoid breathing exhaust.

Check load: Compare actual kW load to generator rating. Reduce load if above nameplate capacity.
Inspect air filter: Remove the air filter element from the JCB engine. If clogged with dust, replace with a new element.
Fuel system: If smoke persists at normal load, have injectors tested and serviced. Poor spray patterns cause black smoke.
Turbocharger: For turbo models, check for free rotation and absence of oil leaks. A seized turbo reduces air supply.

Hard 4/5

Air Filter Element

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