 PWK 38 AG Short Body with Air Screw and Idle Speed Screw |
 JDJetting Jet Kit Package |
 4-Stroke Fuel Screw Mixture Lean to Rich in 1/2 Turn Steps |
 Air Fuel Screw Mixture Lean to Rich |
 Diaphragm and Leak Jet Effects on Accelerator Pump Flow |
 Approximate Pump Timing Gap to Check, Allowing Full Pump Refill and Immediate Squirt with Throttle Use |
 Setting Pump Timing screw |
 Route the bottom overflow tube to reduce spilled fuel in rough terrain |
 Leak Jet and Diaphragm Effects on Accelerator Pump Flow Volume |
 Accelerator Pump with O-ring Wrapped Around Linkage as Described in Kit |
 Yamaha and Kawasaki Fuel Screw Block |
 Float Bowl and Leak Jet- JDJetting part #JDKH05 |
 Punching out Fuel Screw Cover |
 Removed Fuel Screw Cover |
 NOTE- THESE ARE PICTURED UPSIDE-DOWN: Pump Diaphrams- Standard #JDKH18 (on left), and Honda Diaphragm #JDKH04 (on right) |
 The Float Needle Seat is Removable and Can Be Replaced with This Version FCR-MX |
 Float Seat and pin parts.jpg |
 Slide Plates:FCR-MX (M Stamp) Slant-FCR (L Stamp:DRZ400E, 99-02 KTM, 98-99 YZ/WR400) and FCR-Small (CRF150R) |
 Engine side view with slide plate correctly oriented in the carb and on the bench |
 FCR Carburetor slide and Vacuum Release Plate (square end MUST be oriented down) |
 Vacuum Plate Seal Orientation 6 |
 Vacuum Plate Seal Orientation 4 |
 Vacuum Plate Seal Orientation 2 |
 Vacuum Release Plate (square end down) |
 Disassebled FCR Carburetor Body - Note - The body gasket is only available for newer models |
 Leak Jet Effects on Air/Fuel - Blocked Jet, #50, and #80 |
 Fuel Screw Effects in 1/2 Turn Steps |
 Linkage-closeup- as the screw is turned inwards, the rod touch-point is delayed |
 BKMod to Reduce the FCR-MX Accelerator Pump Stroke |
 Turn the Choke Knob on PJ and PWM carburetor to set the idle speed |
 FCR-MX Accel Pump Linkage- as the screw is turned inwards, the rod touch-point is delayed |
 FCR-MX 2000 Yamaha Version |
 Honda TMX versions, with Throttle Position Sensor on left |
 2004-2007 Honda TMX compared to 2001-2003 |
 2004-2007 Honda TMX vs 2001-2003 |
 Mikuni TMX Slide 1989 |
 Mikuni TMX Slide 1989 |
 Jet Kit Needles with Leaner Taper Position and Clip Offset |
 Keihin PWM and PWK Air Striker |
 KTM 2-Stroke Stock 36mm PWK |
 KTM 2-Stroke 38mm PWM |
 FCR-MX Accelerator Pump Cams and Followers |
 FCR_Pump_Cam_KTM |
 FCR-MX Accelerator Pump Cams and Followers |
 FCR-MX Carburetor with Throttle Position Sensor (TPS) Electrical Lead |
 FCR-MX Carburetor - Yamaha Air Cut Valve to richen on deceleration |
 KTM400EXC Dyno OBCVR with no Main Jet |
 Keihin Accelerator Pump Lower/Upper Check Valves |
 4 Keihin CB750 Carbs Fed by One Accelerator Pump Diaphragm |
 Sudco Single Taper vs JD Triple Taper |
 JDJetting Needle Identification- Scribe Lines Below Clip Slots |
 Standard Keihin Needles.jpg |
 Honda Needle A705.jpg |
 Pinched Linkage - By pinching the linkage almost closed, the pump will only partly refill and squirt less fuel |
 IM001254.JPG |
 IM001256.JPG |
 FCR Carb Accelerator Pump Covers and Pump Timing Linkage Spacer |
 Keihin 38mm PWM, 38mm PWK Air Striker, and 38mm PWK AG TP Version Carburetors |
 PWK AirStriker PWK AG with TPS Option |
 Fuel Screw and Pump Parts |
 FCR Removeable Intake Flange and Pilot Air (LEFT) and Main Air (RIGHT) Jets |
 Float Bowl and other associated Parts |
 Keihin FCR-MX carbs |
 Keihin FCR-MX carbs |
 FCR-MX Carbs with no Main Air Jet- Only the Pilot Air Jet is visible on the left |
 Accelerator pump testing |
 Accelerator pump testing |
 Accelerator Pump testing: Diaphragms, Leak Jets, Covers |
 Accelerator Pump Linkage Safety Wired to be Rigid |
 Test stand for accelerator pump duration and distance |
 Accelerator Pump Covers |
 Linkage springs |
 Pump Timing Screw |
 Main Jets 4.jpg |
 Main Jet Section.jpg |
 FCR Needle Graph0.JPG |
 FCR Needle Graph1.jpg |
 FCR Needle Graph2.jpg |
 FCR Needle Graph3.jpg |
 FCR Needle Graph4.jpg |
 FCR Needle Graph5.jpg |
 PWK Slides 6 (#JDKH11), 7 (#JDKH12), 8 (#JDKH13), from Left to Right |
 Backwards FCR Slide Plate |
 FCR_carb.jpg |
 JDJetting |
 Air Fuel Screw Mixture Lean to Rich 1.jpg |
 Keihin PWK Carburetor Slide Cutaway Described |
 Keihin Slide Cutaway Height C.A. Measurement (MM) |
 FCR1 Accelerator Pump Mod |
 FCR1 Accelerator Pump Mod |
 FCR1 Accelerator Pump Mod |
 FCR1 Accelerator Pump Mod |
 35mm FCR1 Carburetor |
 FCR MX Carb |
 IM000535.JPG |
 PWK GRAPHS FOR EXPLANATION |
 PWK GRAPHS FOR EXPLANATION |
 IMG_1445.JPG |
 Dyno Testing Measuring Horsepower |
 FCR-MX Carburetor and Pump Linkage |
 Accessing the needle from the top of the slide on the FCR Carburetor - This carb has an emissions stop to limit throttle opening |
 Accessing the Main Jet and Pilot Jet by Turning the Carb |
 FCR Standard (98-99 YZ/WR400) pilot jet on left, and newer FCR-MX pilot jet (2000+ YZ/WR 400-450) and PWK pilot jet on right |
 PWK Pilot Jet and Air Holes |
 Keihin Drain Screw All.jpg |
 Keihin PWK Carburetor Dimensions |
 Keihin PWK Carburetor Dimension Chart |
 carbswap1.jpg |
 60463416_MeasuredPumpForce2.jpg |
 PWM Carburetor Stock Slide Before Modification |
 ***PWM Carburetor Slide After Modification- File notch as shown, 2mm in depth |
 PWM Carburetor Before Mod |
 ***PWM- Visual Check After Slide Mod- 1.0 - 1.5mm opening |
 PWM Carburetor Before Modification |
 ***PWM Carburetor After Needle Shroud Modification - File notch as shown |
 PWM Carburetor Before Mod |
 ***PWM- Visual Check After Needle Shroud Mod- Needle is Visible |
 PWM Carburetor Slide Mod- Before and After |
 PWK Slide from KTM |
 PWK Needle Shroud on the 36mm PWK carburetor |
 Keihin PWK Slide from KTM |
 PWK carburetors, KTM and Standard Air Striker |
 AirStriker and Older PWK that also looks like the PWM Intake |
 38mm Keihin PWM Carburetor - Choke knob turned to adjust idle speed. Air screw is brass on side by fuel inlet. |
 PWK Air Striker - part #JDKH08 |
 Mikuni TMX Carburetor |
 Mikuni TM Carburetor |
 thumbnail.jpeg |
 image1.png |
 PWK Air Striker Carburetor |
 Keihin PWK Cable Holder (fits PWK and PWM) |
 Keihin PWK Slide Cable Holder (fits PWK and PWM) |
 Cable Holder PWM ONLY (has a bump on top) -Do NOT use in PWK Slide, Will BIND NEEDLE |
 YZ250 Cable Holder Parts are Different than JDJetting JDKH16 and Do Not Interchange |
 PWM Carburetor cable holder is different than PWK Carb cable holder- Hole is smaller and Binds the Needle if used in a PWK Slide |
 PWM Carburetor cable holder is different than PWK Carb cable holder |
 250 300 Keihin PWK 36mm Carburetor |
 GasGas 250 300 PWK 36mm Carburetor |
 FCR Needle Jet |
 Slant FCR vs FCR MX Carbs |
 Slant FCR Carb |
 Slant FCR Carb- Fuel Inlet Side |
 Slant FCR vs FCR-MX Carburetor- Fuel Line Side |
 Keihin Older Version FCR 39mm Carb |
 Keihin FCR-MX Pump Linkage Honda 06 vs 07 CRF450R |
 PWK Carb Power Jet Tube Viewed from Motor Side |
 PWK Carb Power Jet Tube Closeup |
 PWK Carb Power Jet Tube Intake Side |
 PWK Carb Power Jet Location in Body on Right |
 Keihin PWK AG Short Body Carb |
 FCR MX Carb Max Needle Depth |
 Example of lean clip positions on needle |
 PWK Slide Yamaha YZ250 vs All Others |
 Humidity and Temperature effects with Oxygen |
 PWK Slide Cable Holder and Needle Clip Recess |
 PWK AG vs PWK AIR STRIKER Jet Blocks.jpg |
 PWK AG vs PWK AIR STRIKER Jet Blocks B.jpg |