Welcome to NRP – Your Carburettor Diaphragm Experts

Since 1988, NRP has specialized in high-quality motorcycle carburettor diaphragms, air cut-off valves (also known as coaster enrichment valves), carburettor overhaul kits, and spares for a wide range of Japanese and European carburettors. We proudly supply essential parts for Honda, Kawasaki, Suzuki, Yamaha, Triumph, Aprilia, and many more top motorcycle brands. From vintage models to modern scooters like Vespa, Piaggio, and Peugeot, our exclusive products are designed to keep your ride performing at its best.

We are the trusted source for many discontinued carburettor parts, offering cost-effective alternatives to original components. Our extensive range covers Mikuni, Keihin, Hitachi, Tokei, and TK Kikaki carburettors from the 1960s to 2005. Where OEM diaphragms are sealed units, we offer a unique service to refit new diaphragms to your original slides or provide loose diaphragms for easy DIY installation. Our re-engineered designs are optimized for enhanced durability, ensuring long-lasting, trouble-free performance.

All of our diaphragms are manufactured using Viton rubber (FKM/Fluorinated) – a superior material that’s completely resistant to modern fuels containing over 10% alcohol (such as E10 Ethanol). Unlike outdated Nitrile diaphragms, our Viton diaphragms are impervious to the aggressive additives found in today’s fuel, offering unmatched reliability and longevity.

Whether you're restoring a classic bike or maintaining your daily rider, NRP delivers the best carburettor repair solutions for enthusiasts and professionals alike.

Search Tips:

To ensure you find the correct part for your motorcycle, we recommend using the dropdown selector, which allows you to search by manufacturer, model, and category. This will display only the parts specific to your model.

If you prefer using the search function, be sure to enter model names like "CB750F" without spaces for the best results. You can also search by model codes such as NC21, NC30, RC30, GK76, VR51A, GV73A, or Kawasaki frame prefixes like ZX1100D, ZX600A, and ZX400C.

Please note that searching by product type (e.g., "carb kit") may return all carb kits in the shop, making it harder to find your specific part.

Payments:

We accept secure card payments via Visa CyberSource (formerly known as WorldPay), allowing you to pay with most major credit and debit cards. Please note that all transactions are processed in GBP (£).

For convenience, we also accept payments through PayPal, giving you flexibility in how you choose to complete your purchase.

KEYSTER Carb kits:

NRP Carbs is the UK distributor for KEYSTER carb kits, the most comprehensive carb rebuild kits available, known for their exceptional quality.

ALL comprehensive kits include main jets, pilot jets, jet needle, needle valve (with seat where removable), float chamber gasket (or seal), mixture screw/spring/O-ring, and all other carb O-rings.

The Keyster carb kits cover models from the 1960s to 2000s. In addition to carburettor overhaul kits and fuel tap diaphragms, we supply gaskets, needle valves (float valves), jet needles, needle jets (emulsion tubes or nozzles), main jets, pilot jets, seals, and spares for all Japanese carbs.

We also supply fuel tap diaphragms and overhaul kits for most models, even when genuine suppliers only offer complete units. We’ve produced internal seals for Honda sealed-unit fuel taps (petcocks) where the tap is riveted at the factory. Many of these taps are discontinued or priced unrealistically.

Inlet rubbers (inlet manifold or carb to head rubbers) and some airbox rubbers/connectors are also available. Some currently discontinued parts are in pre-production and will be available soon.