E-Z-GO ST 4x4 2+2 Carburetor Adjustment & Settings

The E-Z-GO ST 4×4 2+2 uses a 480 cc twin-cylinder OHV engine with a fixed-jet bowl carburetor and pulse fuel pump. Carb tuning is mainly about clean jets, correct fuel level and proper throttle/governor linkage.

E-Z-GO Carburetor Guide

ST 4×4 2+2 • Adjustment & settings

Carbureted gasoline version.Applies to

480 cc twin-cylinder OHV gasolineEngine

Use the exact service-manual settingIdle

Fixed-jet system: correct jetting, float and needle condition and fuel delivery matter more than a generic screw settingMixture

ST 4×4 2+2 carburetor setup at a glance

Model-specific setup

The ST 480 specification uses a 480 cc twin-cylinder OHV engine with a fixed-jet bowl carburetor, pulse fuel pump and ground-speed governor.

Carburetor: Fixed-jet bowl carburetor with pulse fuel pump

Before adjusting

This page covers the carbureted gasoline version. Confirm the engine and carburetor match this setup before using any setting below.

VehicleE-Z-GO ST 4×4 2+2

Engine480 cc twin-cylinder OHV gasoline.

CarburetorFixed-jet bowl carburetor with pulse fuel pump.

Idle speed

Use the exact service-manual setting

Pilot / mixture

Fixed-jet system: correct jetting, float and needle condition and fuel delivery matter more than a generic screw setting

Float level

Use the exact carburetor float-height specification

Choke

Fully open after warm-up; verify cable free play

Governor / linkage

Keep the factory governor and linkage setting

Before adjusting

Clean air filter, fresh fuel, correct spark, no intake leaks and free throttle linkage

1. IdentifyConfirm engine + carburetor family

2. Clean and inspectJets, bowl, needle, choke, intake boot

3. Set baselineIdle / pilot / float only from the right manual

4. RecheckWarm idle, takeoff, load response and hot restart

How to adjust the E-Z-GO ST 4×4 2+2 carburetor

Confirm this E-Z-GO ST 4×4 2+2 matches the carbureted setup shown above. If the vehicle has EFI or no carburetor, do not use these adjustments.

Identify the engine and carburetor before turning any screw. Engine/application: 480 cc twin-cylinder OHV gasoline. Carburetor: Fixed-jet bowl carburetor with pulse fuel pump.

Before adjusting anything, check fresh fuel, tank venting, fuel-filter and pump delivery, the air filter, intake boot or manifold, spark plug and choke operation. A carburetor setting will not fix a fuel restriction, intake leak or weak ignition.

Warm the engine fully and set idle using this baseline: Use the exact service-manual setting. Make sure throttle-cable tension or governor linkage is not holding the throttle plate open.

For the pilot/mixture circuit: Fixed-jet system: correct jetting, float and needle condition and fuel delivery matter more than a generic screw setting. Only change an adjustment that the exact carburetor is designed to have, and make small changes before rechecking warm idle and throttle response.

For float and fuel level: Use the exact carburetor float-height specification. Then verify choke release, hot restart and smooth transition from idle into governed speed without surging, hesitation or flooding.

ST 4×4 2+2 carburetor symptoms

Runs only with choke

Usually points to a lean condition: dirty pilot and main circuit, restricted fuel supply or intake leak.

Black smoke / rich

Check that the choke fully opens, then inspect float and needle, fuel level and air filter.

Hunts or surges

Check pilot circuit, intake leaks and governor and throttle linkage before changing the idle stop.

High idle

Make sure cable tension or governor linkage is not holding the throttle plate open.

Stalls when warm

Check pilot passage, idle baseline, valve or compression condition and heat-related fuel restriction.

Bog when throttle opens

Inspect transition/main circuit and fuel delivery; an idle adjustment will not fix a blocked main jet.

ST 4×4 2+2 carburetor specifications

Applies to: Carbureted gasoline version.

Engine: 480 cc twin-cylinder OHV gasoline.

Carburetor: Fixed-jet bowl carburetor with pulse fuel pump.

Idle: Use the exact service-manual setting.

Mixture: Fixed-jet system: correct jetting, float and needle condition and fuel delivery matter more than a generic screw setting.

Float: Use the exact carburetor float-height specification.

Choke: Fully open after warm-up; verify cable free play.

Governor: Keep the factory governor and linkage setting.

Model-specific note

The ST 480 specification uses a 480 cc twin-cylinder OHV engine with a fixed-jet bowl carburetor, pulse fuel pump and ground-speed governor.

E-Z-GO ST 4×4 2+2 carburetor FAQ

What is the correct E-Z-GO ST 4×4 2+2 carburetor idle setting?

Use the exact service-manual setting. Confirm the exact model year and engine before using a numeric setting.

What is the E-Z-GO ST 4×4 2+2 mixture-screw setting?

Fixed-jet system: correct jetting, float and needle condition and fuel delivery matter more than a generic screw setting.

What is the E-Z-GO ST 4×4 2+2 carburetor float setting?

Use the exact carburetor float-height specification.

Why does my E-Z-GO ST 4×4 2+2 only run with the choke on?

That usually means the engine is running lean because of a restricted pilot and main passage, weak fuel delivery or an intake leak. Clean and diagnose the carburetor before simply richening the mixture.

Can the governor make an E-Z-GO ST 4×4 2+2 look like the carburetor is out of adjustment?

Yes. Incorrect cable or governor linkage can hold the throttle open, cause hunting or limit throttle travel. Confirm linkage movement before changing carburetor settings.

What should I check before rebuilding the E-Z-GO ST 4×4 2+2 carburetor?

Check fuel quality, tank vent, filter and pump delivery, air filter, intake leaks, choke operation, spark plug, valve or compression condition where applicable and throttle and governor linkage.

Match the carburetor to the exact vehicle

Idle RPM, pilot screw baseline, float height, jetting and governor and linkage settings can change by engine, carburetor and model year. This page applies to the carbureted gasoline version. Verify the engine and carburetor ID before changing settings, and use the factory service manual for any value not explicitly listed here. For manufacturer documentation, visit the official manufacturer website.