Take photos of the vacuum hoses, accelerator cable, and choke cable locations to ensure correct reconnection. Disconnect the fuel line, vacuum hoses, and cables. Step 2: Carburetor Removal
Remove and clear the idle jet with compressed air; check torque on base nuts. Float level is too high or needle valve is stuck open.
With the engine running at a slightly elevated idle, slowly turn the clockwise (leaning out the fuel mixture) a quarter-turn at a time. Listen closely to the engine note.
Clamp the fuel inlet line to prevent spillage. Loosen the hose clips and pull off the fuel inlet and fuel return pipes. maruti zen carburetor service manual
Gently screw it clockwise until it bottoms out completely. , or you will damage the needle tip and ruin the carburetor body casting.
Flooded carburetor; stuck float; worn needle valve; leaking power valve.
A Maruti Genuine Parts (MGP) or reputed aftermarket Carburetor Repair Kit (includes a new top gasket, O-rings, accelerator pump diaphragm, and needle valve). Take photos of the vacuum hoses, accelerator cable,
The engine cranks excessively when cold or hot.
Inspect the accelerator pump diaphragm. If it is torn, hardened, or cracked, replace it using the component from your rebuild kit. 5. Reassembly and Float Level Bench Adjustment
Before touching the carburetor screws, verify that your ignition timing is set correctly to 5° BTDC. Faulty ignition timing mimics carburetor issues. Step 2: Setting the Idle Speed Float level is too high or needle valve is stuck open
Before servicing the carburetor, review these standard factory specifications for the carbureted Maruti Zen (G10B engine): Component / Parameter Specification 993 cc (G10B) Carburetor Type Two-barrel, twin-choke, downdraft progressive Actuation Mechanical primary, vacuum-operated secondary Idle Speed 850 ± 50 RPM (Engine at operating temperature) Ignition Timing 5° BTDC at idle speed Fuel Pump Pressure 3.0 to 4.5 PSI (Mechanical fuel pump) Float Level 10 mm (Standard factory seating height) 2. Tools & Supplies Needed
Located on the throttle linkage, adjust this to set the engine RPM.
Spray carburetor cleaner liberally through all jets, venturis, and passages.
Turn the idle speed screw (the larger screw on the throttle linkage) until the engine settles at roughly 800–900 RPM. The Volume Control (Mixture) Screw