Prox Valves for motorcycle engines

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Unlock the ultimate performance and reliability for your motorcycle with PROX Racing Parts, the premier choice for riders and mechanics worldwide who demand uncompromising quality for their engine. For decades, PROX has been a cornerstone of the powersports industry, supplying high-quality, dependable engine components that meet or exceed OEM specifications. When it´s time to rebuild, repair, or upgrade your machine, PROX provides the precision-engineered parts you need to restore power and ensure durability, lap after lap, and trail after trail.

At the heart of every high-revving four-stroke engine lies the valve train, and it is here that PROX´s engineering prowess truly shines. Specializing in high-performance motorcycle valves, PROX offers a comprehensive solution to restore or upgrade your engine´s top end. Whether you´re rebuilding after a long season of motocross or seeking a durable upgrade for your enduro machine, PROX valves are engineered for excellence. Choose from lightweight Titanium valves, designed for maximum RPM and instant throttle response, mirroring the technology used by factory race teams. These valves are perfect for the competitive rider seeking every possible advantage on the track.

For riders prioritizing longevity and resilience, the PROX Steel Valve and Spring Kits are a game-changer. These kits are a popular and intelligent conversion for modern MX and off-road bikes, offering superior durability and extended service intervals compared to some stock titanium components. Each steel valve is manufactured from premium-grade steel with a nitride coating for exceptional hardness and heat resistance, ensuring a perfect seal and consistent compression under the most extreme conditions. The kits are complete, often including perfectly matched valve springs and seals, taking the guesswork out of your top-end rebuild and guaranteeing optimal valve train stability. By choosing a PROX valve solution, you are investing in restored engine performance, improved airflow, and the peace of mind that comes with rock-solid reliability.

PROX´s commitment to quality extends far beyond the cylinder head. Their extensive catalog includes everything you need for a complete engine overhaul. Discover their renowned piston kits, available in multiple sizes for a perfect fit, connecting rod kits for a robust bottom end, and complete gasket and seal kits that ensure a leak-free assembly. Every component, from bearings to clutch plates, is produced in state-of-the-art manufacturing facilities, leveraging the same technologies and quality control as the leading Japanese and European motorcycle brands.

For the dedicated rider on a motard, dirt bike, or ATV, PROX represents the perfect balance of performance, durability, and value. Don´t let a worn-out engine hold you back. Explore the full range of PROX engine components at motardinn and give your motorcycle the competitive edge and bulletproof reliability it deserves

Prox Valves for motorcycle engines

Prox Yamaha XT/TT/TTR 600 28.2600-2 intake valve

Prox Yamaha Yfm350F Warrior ´87-04 + Xt600/E ´84-02 Valve Retainer Kit

Prox Honda CRF150R 07-22 VC12272 intake valve

Prox KTM 450-500 Exc-F ´20-23 + Fe 450-501 ´20-23 exhaust valve

Prox Gas G250 21-23/Husq/KTM250SX-F 13-23/EXC-F 14-23 VC63332 intake valve

Prox 9.48x1.65 mm valve shim 5 units

Prox Honda CRF 250 R/X 28.1334-1 intake valve

Prox Suzuki DRZ/LTZ 400 28.3402-1 intake valve

Prox Yamaha WR 400 F/YZ 426 F 28.2418-3 intake valve

Prox Suzuki Rm-Z450 ´05-06 + Dr-Z400 ´00-19 Valve Retainer Kit

Prox Honda CRF250R 08-09 VCSIS13372 intake valve

Prox Honda XR400R 96-04 + TRX400EX/X 99-14 VC14951 exhaust valve

Prox Kawasaki KLX-R03/Suzuki DR-Z400 00-22/LT-Z400 03-18 VC34022 intake valve

Prox Honda CRF230F 03-19 + CRF150F 03-05 VC13231 exhaust valve

Prox Honda CRF250R 10-15 VC13401 exhaust valve

Prox Yamaha YZ400F 98-99 + WR400F 98-00 + YZ426F00 VC24181 exhaust valve

Prox Honda XR 600 R/FMX 650 28.1654-2 intake valve

Prox Honda CRF150R 07-22 VC12271 exhaust valve

Prox Honda CRF230F ´03-19 + CRF150F ´03-05 intake valve

Prox Husqvarna Tc-Te450/510 ´05 intake valve

Prox Sea-Doo Gtx-4Tec ´03-09 + Rxp/Rxt ´0 intake valve

Prox Yamaha Yfm350 Raptor ´05-13 + Wolverine ´95-09 Valve Retainer Kit

Prox Kawasaki Kx450F ´06-19 + KFX450R ´08-14 Valve Retainer Kit

Prox 7.48x 2.125 mm valve shim 5 units

Prox 7.48x1.225-3.475 mm valve shim

Prox 7.48x2.05 mm valve shim 5 units

Prox Honda XR 400 R/TRX 400 EX 28.1495-1 intake valve

Prox Honda XR 400 R/TRX 400 EX 28.1495-2 intake valve

Prox Yamaha YZ 450 F 28.2444-2 Titanium intake valve

Prox Honda CRF250R 04-07 + CRF250X 04-17 VC13341 exhaust valve

Prox Honda CRF250R 10-17 VCSIS13402 intake valve

Prox Honda CRF450R 02-06 VC14021 exhaust valve

Prox Honda XR400R 96-04 + TRX400EX/X 99-14 VC14952 intake valve

Prox Yamaha 660 Raptor 01-05 + Grizzly 02-08 VC26612 intake valve

Prox Yamaha YFM700R Raptor 06-23/Grizz19-23/XT660R/X 04-11 VC27061 exhaust valve

Prox KTM520/525 00-07 + 450/525XC ATV VC65201 exhaust valve

Prox 10.00x2.925 mm valve shim 5 units

Prox 10.00x2.95 mm valve shim 5 units

Prox 10.00x3.00 mm valve shim 5 units

Prox 28.SES2444-1 Springs intake valve

Prox 28.SIS6351-2 Springs intake valve

Prox 7.48x 1.325 mm valve shim 5 units

Prox 7.48x 1.525 mm valve shim 5 units

Prox 7.48x 1.575 mm valve shim 5 units

Prox 7.48x 1.625 mm valve shim 5 units

Prox 7.48x 1.675 mm valve shim 5 units

Prox 7.48x 2.025 mm valve shim 5 units

Prox 7.48x 2.175 mm valve shim 5 units

Prox 7.48x 2.225 mm valve shim 5 units

Prox 7.48x 2.275 mm valve shim 5 units

Prox 7.48x 2.375 mm valve shim 5 units

Prox 7.48x 2.675 mm valve shim 5 units

Prox 7.48x 2.725 mm valve shim 5 units

Prox 7.48x 2.825 mm valve shim 5 units

Prox 7.48x 2.875 mm valve shim 5 units

Prox 7.48x 2.975 mm valve shim 5 units

Prox 7.48x1.20 mm valve shim 5 units

Prox 7.48x1.40 mm valve shim 5 units

Prox 7.48x1.50 mm valve shim 5 units

Prox 7.48x1.60 mm valve shim 5 units

Prox 7.48x1.65 mm valve shim 5 units

Prox 7.48x1.85 mm valve shim 5 units

Prox 7.48x2.00 mm valve shim 5 units

Prox 7.48x2.25 mm valve shim 5 units

Prox 7.48x2.50 mm valve shim 5 units

Prox 7.48x2.60 mm valve shim 5 units

Prox 7.48x2.65 mm valve shim 5 units

Prox 7.48x2.70 mm valve shim 5 units

Prox 7.48x2.80 mm valve shim 5 units

Prox 7.48x2.90 mm valve shim 5 units

Prox 7.48x2.95 mm valve shim 5 units

Prox 7.48x3.00 mm valve shim 5 units

Prox 7.48x3.05 mm valve shim 5 units

Prox 7.48x3.10 mm valve shim 5 units

Prox 7.48x3.15 mm valve shim 5 units

Prox 8.90x1.72 mm valve shim 5 units

Prox 8.90x1.76 mm valve shim 5 units

Prox 8.90x1.82 mm valve shim 5 units

Prox 8.90x1.86 mm valve shim 5 units