PREDATOR GENERATOR 3500 INVERTER SURGING IDLE General Troubleshooting

Carburetor Assembly

The pilot jet in these units is prone to clogging from fuel stabilizers and ethanol varnish. This causes a lean-burn condition that the stepper motor attempts to correct by rapidly cycling the throttle, resulting in a surge. Replacing the entire assembly ensures that both the pilot circuit and the main nozzle are clear of obstructions.

SKU: 63584 / 16100-Z0V0110-00

Carburetor Pilot Jet (Slow Jet)

This is the most granular component responsible for idle fuel delivery. If the engine only surges at idle but runs fine under heavy load, this specific orifice is restricted. Replacing or meticulously cleaning this brass component restores the correct air-fuel ratio at low throttle openings.

Carburetor Insulator Gasket

An air leak at the intake manifold or insulator block introduces unmetered air into the system. This creates a lean mixture similar to a clogged jet, causing the governor to hunt for a steady RPM to prevent stalling.