Keihin PWK 35mm Carburetor Fitment Guide
The Keihin PWK 35mm carburetor is a high-performance flat-slide carburetor commonly used on 2-stroke motorcycles, ATVs, racing applications, and modified engines. It is especially popular on 125cc–300cc performance engines where increased airflow and throttle response are desired.
This guide provides common motorcycle and ATV applications for a PWK 35mm carburetor. Depending on the year, engine, intake manifold, airbox, and carburetor version, installation may require an intake boot, adapter, throttle cable, air-filter adapter, or other modifications.
Important Fitment Information:
A 35mm PWK carburetor is not automatically a direct bolt-on replacement simply because the original carburetor is a similar size. Always verify the intake boot diameter, airbox connection, carburetor length, throttle cable, choke arrangement, fuel inlet location, and vent routing before installation.
Common PWK 35mm Applications
| Make | Model | Years | Application |
| Honda | CR125R | Various Years | Common PWK35 performance upgrade / conversion |
| Honda | CR250R | Various Years | Performance / conversion application; verify intake dimensions |
| Honda | TRX250R | 1986–1989 | Common PWK35 performance conversion |
| Honda | ATC250R | Various Years | Common PWK35 performance conversion |
| Kawasaki | KDX200 | Various Years | PWK35 upgrade / performance application |
| Kawasaki | KDX220R | 1997–2005 | Common PWK35 performance upgrade |
| Suzuki | RM125 | Various Years | PWK35 performance / conversion application |
| Suzuki | RM250 | Various Years | Performance / conversion application; verify fitment |
| Suzuki | LT250R Quadracer | 1985–1992 | PWK35 conversion / performance application |
| Suzuki | LT500R Quadzilla | 1987–1990 | PWK35–39 performance carburetor application |
| KTM | 125 / 150 SX | Various Years | Performance upgrade / custom application |
| KTM | 250 SX / EXC | Older Models | PWK35 performance / conversion application |
| Yamaha | YZ125 | Various Years | PWK35 performance / conversion application |
| Yamaha | YZ250 | Various Years | Performance / conversion application; verify intake dimensions |
| Yamaha | YFS200 Blaster | 1988–2006 | Performance conversion, especially modified / big-bore engines |
| Yamaha | YFZ350 / Banshee | 1987–2006 | PWK35 performance conversion; typically used as a pair |
Yamaha YFZ350 / Banshee PWK 35mm Application
The Yamaha YFZ350 Banshee is a popular application for PWK carburetors. A PWK35 setup on a Banshee is generally configured as a dual-carburetor system, with one carburetor feeding each cylinder.
PWK35 carburetors can be used for performance applications on stock or modified Banshee engines, but installation may require appropriate intake manifolds, throttle cable arrangements, air-filter connections, fuel lines, and synchronization of the two carburetors.
Banshee Note:
This listing is for a single PWK35 carburetor unless otherwise stated. A Yamaha YFZ350 / Banshee normally requires two carburetors for a dual-PWK setup.
PWK 35mm Carburetor Specifications
| Carburetor Type | Keihin PWK-style flat-slide carburetor |
| Bore Size | 35mm |
| Engine-Side Connection | Approximately 42mm OD on standard PWK35 configuration |
| Air-Filter Connection | Approximately 59mm OD on standard PWK35 configuration |
| Carburetor Body Dimension | Approximately 91mm |
| Overall Dimension | Approximately 163.3mm |
| Carburetor Style | Flat-slide / D-slide |
Note: Dimensions are based on standard Keihin PWK35 specifications. Aftermarket PWK-style carburetors may have different spigot diameters, air-filter diameters, body lengths, cable locations, choke locations, or vent arrangements. Always compare the physical dimensions of your existing carburetor before ordering.
PWK 35mm Jetting Information
Jetting requirements vary significantly depending on engine size, exhaust system, air filter, elevation, temperature, fuel, premix ratio, ignition timing, and engine modifications.
For reference, Keihin's standard PWK35 70R specification uses:
| Specification | Standard PWK35 |
| Main Jet | #160 |
| Slow / Pilot Jet | #68 |
| Jet Needle | 48-DGK |
| Throttle Valve | 6.0 |
| Float Height | 16mm |
Jetting Warning:
These specifications are a reference starting point only and are not guaranteed to be correct for every motorcycle. Always properly tune the carburetor for the specific engine and riding conditions. Incorrect jetting can cause poor performance or engine damage.
Before Ordering a PWK 35mm Carburetor
Before purchasing, compare your original carburetor and intake system against the following specifications:
- Engine-side spigot diameter – Verify that the intake boot will securely fit the PWK35.
- Air-filter / airbox connection – Verify the airbox boot or filter fits the carburetor.
- Carburetor length – Make sure there is enough room between the engine and airbox.
- Throttle cable – Verify cable length, cable end, adjuster, and routing.
- Choke system – Verify that the choke mechanism is compatible with your application.
- Fuel inlet – Check fuel-line routing and clearance.
- Vent hoses – Ensure all carburetor vent hoses have proper clearance and routing.
- Jetting – The carburetor must be properly jetted for your engine and riding conditions.
PWK 35mm Installation Checklist
- Remove the original carburetor.
- Inspect the intake boot for cracks, damage, or deterioration.
- Verify the PWK35 engine-side diameter matches the intake boot.
- Install the throttle cable and verify full slide movement.
- Connect the fuel line and verify there are no leaks.
- Connect and route the carburetor vent hoses properly.
- Connect the airbox boot or air filter.
- Verify the throttle snaps completely closed before starting the engine.
- Start with appropriate baseline jetting.
- Warm the engine and properly tune the carburetor.
Why Choose a PWK 35mm Carburetor?
- Large 35mm airflow capacity
- Flat-slide throttle design
- Quick throttle response
- Excellent tuning potential
- Widely available replacement jets and tuning components
- Popular choice for modified 2-stroke engines
- Commonly used in motorcycle, ATV, racing, and custom applications
Fitment Disclaimer
This fitment guide is provided as a reference and is intended to help identify common applications for PWK 35mm carburetors. It does not guarantee direct bolt-on installation for every year or configuration. Motorcycle and ATV manufacturers may have changed carburetors, intake boots, airboxes, throttle cables, and other components during production.
Always verify physical dimensions and connection points before ordering. Aftermarket PWK-style carburetors may differ from genuine Keihin specifications.
Professional installation and carburetor tuning are recommended. Always verify safe throttle operation before riding.
