All Balls Accelerator Pump Rebuild Kit for Kawasaki KLX450R 2003-2011 — seals, diaphragms & hardened bushings

All Balls Racing Accelerator Pump Rebuild Kit restores the accelerator pump assembly for compatible motocross and off-road bikes, renewing performance and sealing for a tighter throttle response.

This rebuild kit supplies the parts needed to refresh the accelerator (accel) pump on select Kawasaki, Yamaha, Suzuki and Honda models. It’s intended for closed-course racing and off-road applications — check your bike’s year and model against the applications before ordering to ensure proper fit. The kit replaces worn seals, diaphragms and hardware so the pump can deliver consistent fuel squirt and help maintain crisp throttle transitions.

Which motorcycles will this kit fit?

Compatibility covers a range of model years across Kawasaki, Yamaha, Suzuki and Honda platforms often used in off-road and race settings. Always verify the part number and year fitment for your specific carburetor body and model to avoid mismatches.

• Kawasaki KLX450R: select years including 2003–2011 variants and AU models 2018–2019 (confirm exact carburetor type).
• Kawasaki KX250F/KX450F and Suzuki RMZ250 model ranges listed in product details.
• Yamaha WR250F, WR450F, YFZ450 and YZ450F models within the years specified; compatibility depends on carburetor assembly.

What parts are included and what do they do?

The kit contains all essential components to properly rebuild the accelerator pump assembly so it performs like new. Components replace aged rubber, hardened bushings and worn needle shafts to improve longevity and resistance to contaminants.

• Replacement diaphragms and O-rings: restore sealing and prevent fuel leaks.
• Composite POM washers: resist water and dirt, reducing friction and wear.
• Case-hardened metal bushings: plated for corrosion protection and extended service life.
• Hardened, precision-ground needle bearing shafts: ensure smooth actuation and accurate fuel delivery.

How will installing this kit affect throttle feel and reliability?

Replacing worn pump components helps maintain consistent fuel metering during sudden throttle openings, which riders notice as improved throttle responsiveness. The upgraded materials and hardened components reduce the frequency of rebuilds and lower the risk of fuel bypass or poor pump action under race conditions.

• Smoother, more predictable throttle transitions during acceleration.
• Reduced chance of fuel leakage from degraded seals.
• Enhanced durability in dirty, wet riding environments thanks to composite washers and plated bushings.

What should I check before buying and installing this kit?

Confirm your bike’s model year and carburetor variant match the kit’s application list, and inspect the existing pump for signs of wear such as torn diaphragms, leaking seals, or loose shafts. Use basic tools and reference service manuals for torque values and assembly order; professional installation is recommended if you’re unsure.

• Verify part fitment against the listed models and your carburetor type.
• Inspect current pump parts for wear to justify a full rebuild.
• Follow service manual instructions for reassembly and break-in procedures.

Who is this for: This All Balls Racing Accelerator Pump Rebuild Kit is aimed at racers, track-day riders and off-road enthusiasts who maintain older carbureted bikes or restore race machines. It’s ideal for anyone needing to replace worn pump internals with durable, race-capable components — provided you confirm vehicle compatibility before purchase.