nibbi PZ20 Carburetor Kit for 50–125cc 4-Stroke ATVs & Pit Bikes — 35mm Double-Foam Air Filter, Adjustable Idle/Mixture

Nibbi PZ20 carburetor kit with a 35mm double-layer foam air filter for 50–125cc 4-stroke quads, pit bikes and go-karts — a direct-fit replacement to restore throttle response and cleaner intake air.

If your small-displacement Tao Tao, SSR, Coolster or similar Chinese ATV, dirt bike or go-kart is running rough, hesitating, or using extra fuel, the Nibbi PZ20 carburetor and matching 35mm filter are built to get intake and fuel metering back in balance. This kit combines a mid-sized PZ20 carb — positioned between PZ19 and PZ22 in performance — with a washable double-foam filter to help keep contaminants out while supporting efficient engine breathing.

How will this carburetor change throttle response and fuel use?

The PZ20 improves throttle responsiveness by offering a slightly larger 20mm intake bore than many stock PZ19 units and finer tuning than PZ22 setups. It includes a cable-operated choke and adjustable idle/air-fuel mixture so you can tune for smoother acceleration and better partial-throttle economy.

• 20mm intake diameter for balanced power and economy
• Adjustable air mixture and idle screws for tuning
• Comes with spare jets (70, 72, 78 mains; 32 pilot) plus original #75/#35
• Cable choke design for reliable cold starts

Will the included air filter protect my engine during off-road rides?

The 35mm air filter features a double-layer foam construction that traps dust and debris while maintaining airflow. It’s washable and reusable, designed to keep intake passages cleaner in dusty, muddy, or sandy riding conditions without significantly restricting flow.

• Double-foam layers for staged filtration
• Washable foam for repeated use and lower operating cost
• Designed to match the PZ20 bore to avoid flow mismatch
• Easy clamp or bolt fitment for quick service in the field

What are the dimensions and compatibility details I need to check?

Confirm the intake and bolt spacing on your engine before ordering: the intake neck is 20mm (0.79") and the bolt hole spacing is 47mm center-to-center. This kit is aimed at a wide range of 50cc–125cc 4-stroke Chinese and similar small-engine vehicles, but always verify fitment visually or by measurement.

• Engine intake diameter: 20mm / 0.79"
• Bolt hole spacing: 47mm center to center
• Pre-installed main jet: #75; pilot jet: #35
• Extra jets included: #70, #72, #78 mains and #32 pilot

How easy is installation and tuning for a DIY mechanic?

Installation is straightforward for anyone familiar with small-engine carb swaps: remove the old carb, bolt the PZ20 in place using the specified spacing, connect the throttle cable and choke, and attach the filter. Final tuning requires adjusting the idle screw and selecting the appropriate jets from the included set to match altitude and fuel quality.

• Standard bolt-on procedure for compatible engines
• Throttle cable and choke-ready design
• Jet kit included to help dialing-in performance
• Manufacturer support available if fitment questions arise

Who is this for? The Nibbi PZ20 carburetor with 35mm air filter is for riders and mechanics restoring or upgrading 50cc–125cc 4-stroke Chinese-made ATVs, pit bikes, go-karts and scooters (examples: SSR, Taotao, Coolster, Apollo, Baja, Sunl and similar models). It’s suitable for owners who want a balance of improved throttle response, tuning flexibility, and reusable filtration without moving to a much larger carburetor. Always measure the intake and bolt pattern before purchase and use the included jets to tune for local conditions.