MothAr PWK 24mm Carburetor for 50–125cc Engines — D-slide, Adjustable Power Jet

The MothAr Universal PWK 24mm carburetor is a drop-in performance replacement designed to fit 50cc–125cc small engines, offering a 24mm bore, D-style throttle slide and an adjustable power jet for improved throttle response.

Built as an aftermarket PWK-style carburetor, this 24mm unit works across a wide range of scooters, ATVs, dirt bikes and mini-motors that accept a 35mm intake manifold and 50mm air-filter mounting. It’s a simple way to refresh fuel delivery on older or modified 50–125cc engines — especially popular for Honda, Yamaha, Kawasaki, Suzuki and many GY6-powered machines. The chrome semi-flat (D) slide and included power jet let tuners refine mid- and top-end throttle behavior while remaining compact and straightforward to install.

Will this carburetor physically fit my engine?

Most fits depend on two key diameters: the intake manifold side and the air filter side. This MothAr PWK 24mm is built for engines whose intake manifold outer diameter is roughly 35mm and whose air-filter attachment measures about 50mm externally.

• Intake manifold outer diameter: 35mm
• Air filter side outer diameter: 50mm
• Recommended engine range: 50cc to 125cc (single and small multi-cylinder setups)
• Common-compatible models: many Honda, Yamaha, Kawasaki, Suzuki, SSR, TTR, TaoTao and GY6-based machines

How does the PWK 24mm change performance and throttle feel?

The 24mm bore size and D-shaped (semi-flat) throttle slide produce a quick, linear throttle response suited to lightweight engines and race-tuned small displacement bikes. The included power jet gives you an additional tuning circuit to control richer mixtures at higher rpm, helping peak power once the carb is correctly jetted for your setup.

• 24mm venturi for improved airflow over restrictive stock carbs
• D-type throttle slide yields sharper throttle transitions
• Power jet allows fine tuning of high-rpm fuel delivery
• Simple needle and jet changes support progressive tuning

What installation and tuning steps should I plan for?

Installation is straightforward for mechanically inclined riders, but you’ll need basic tools, hose clamps and possibly an adapter or manifold gasket to obtain a perfect seal. After mounting, expect to adjust the pilot jet, main jet and needle height to match altitude, exhaust and air filter changes.

• Verify manifold and filter diameters before fitting
• Use a new gasket and secure clamps for airtight connections
• Start with stock jetting and make incremental jet/needle adjustments
• Check for air leaks, smooth idle, and correct high-rpm behavior after tuning

What materials and features help durability and serviceability?

The MothAr PWK 24mm uses a chrome semi-flat slide and a power jet design that’s familiar to tuners, making it easy to find replacement jets and spares. Its aftermarket construction balances affordability with parts interchangeability for long-term serviceability.

• Chromed semi-flat (D) throttle slide for reduced wear and smooth action
• Standard jet sizes and needles for easy sourcing of spares
• Simple bowl and float design for straightforward cleaning and inspection
• Compatible with a wide range of small-engine intake setups

Who is this for: Riders, hobbyists and mechanics who want a compact, tunable carburetor for 50cc–125cc scooters, mini-bikes, dirt bikes and ATVs. It’s suited to projects where improved throttle response and easier tuning are desired, and for anyone replacing an aged stock carb or building a performance-focused small-displacement engine. Note: confirm manifold and filter diameters before purchase and perform proper jetting to match your exhaust, elevation and riding style.