Dirt Bike Engine Valves and Parts
Dirt Bike Engine Valves & Parts: Kibblewhite Black Diamond Exhaust Valves & Spring Kits at JJ Motorsports
Upgrade your dirt bike's valvetrain for maximum flow, heat resistance, and durability with premium valves and parts from JJ Motorsports, precision-engineered for superior performance in motocross, enduro, and trail riding. Our selection includes Black Diamond stainless steel exhaust valves, high-RPM spring kits, keepers, seals, and guides designed for increased lift, reduced wear, and reliable operation under extreme valve float conditions. Compatible with popular 4-stroke models like Honda CRF, Yamaha YZ/WR, KTM SX/EXC, and more, these Kibblewhite components feature one-piece forging, nitride coatings, and dual-spring technology to enhance airflow, prevent valve train failure, and support big-bore or high-compression builds. From exhaust valves with swirl-polished stems to titanium retainer spring kits for lightweight strength, rebuild your cylinder head for championship-level power, longevity, and confidence on every rev.
Shop trusted brands like Kibblewhite for race-proven quality. Explore related categories such as dirt bike piston and ring kits for full top-end rebuilds or dirt bike engine for camshafts and gaskets.
Top Dirt Bike Valve & Parts
- Kibblewhite Valve - Exhaust - Black Diamond 30-33616 – One-piece Black Diamond stainless steel exhaust valve with nitride coating, swirl-polished stem, and hard tip; designed for high-RPM durability and flow in 4-stroke engines.
- Kibblewhite Spring Kit 40-41600 – Dual-spring kit with titanium retainers, chromoly seats, and high-strength springs; supports increased lift and RPM while preventing valve float in performance builds.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
On Sale
PROX Valve and Spring Kit 28.SES4335-1
PROX
MSRP: $155.95Now: $127.00Was: $155.95If you're running your engine hard—whether on the track or in sustained high-RPM conditions—OEM valves and springs become the weak link. The PROX 28.SES4335-1 Kit replaces them with nitrided steel valves and premium chrome vanadium springs engineered to...09261457- SKU:
- 09261457
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SPRING KIT
- MATERIAL:
- STEEL
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
MSRP: $155.95Now: $127.00Was: $155.95 -
On Sale
PROX Valve and Spring Kit 28.SIS2402-2
PROX
MSRP: $212.95Now: $167.00Was: $212.95If you're pushing your engine to its limits, OEM valves and springs will fail you—they simply aren't engineered for sustained high-RPM abuse. The PROX 28.SIS2402-2 replaces those weak points with nitrided steel valves and premium chrome vanadium springs...09261460- SKU:
- 09261460
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- SPRING KIT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- UNITS:
- KIT
MSRP: $212.95Now: $167.00Was: $212.95 -
On Sale
PROX Exhaust Valve 28.6520-1
PROX
MSRP: $56.95Now: $47.00Was: $56.95Exhaust valve performance directly impacts cylinder head efficiency and engine longevity. The PROX 28.6520-1 delivers OEM-specification precision without compromise, ensuring reliable valve sealing across high-cycle operating conditions. For racers and...09260688- SKU:
- 09260688
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $56.95Now: $47.00Was: $56.95 -
On Sale
PROX Valve and Spring Kit 28.SIS1403-2
PROX
MSRP: $143.95Now: $119.00Was: $143.95If you're running your engine hard—whether on the track or in high-RPM tuning applications—OEM valves and springs become your weakest link. The PROX 28.SIS1403-2 Kit replaces them with nitrided steel valves and premium chrome vanadium springs engineered...09261020- SKU:
- 09261020
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- TYPE:
- VALVE
MSRP: $143.95Now: $119.00Was: $143.95 -
Wiseco Steel Valve Kit Honda CRF250R 2004-2007 SVKB1336
WISECO
$365.95If you're pushing your CRF250R beyond stock limits, the factory valve train becomes your first reliability bottleneck. This Wiseco steel valve kit replaces those compromised components with precision-engineered intake and exhaust valves designed to...09263058- SKU:
- 09263058
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
$365.95 -
Wiseco Valve Kit for Honda CRF250R 2008-2009 SVKB1337
WISECO
$365.95If you're rebuilding or refreshing your CRF250R's top end, valve quality directly impacts combustion efficiency, engine longevity, and overall reliability. The Wiseco SVKB1337 delivers a complete valve solution engineered to OEM specifications,...09263059- SKU:
- 09263059
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
$365.95 -
Wiseco Valve Kit Honda CRF250R 2010-2015 SVKB1340
WISECO
$365.95The Honda CRF250R demands valve components that can handle the demands of competition and high-mileage riding. Wiseco's SVKB1340 valve kit delivers OEM-quality steel valves and precision-engineered springs that restore or exceed factory performance...09263060- SKU:
- 09263060
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
$365.95Qty in Cart: 0Quantity:Price:$365.95Subtotal: -
Wiseco Valve Kit Honda CRF450R 2009-2012 SVKB1409
WISECO
$365.95When you're rebuilding or refreshing your CRF450R's top end, valve quality directly impacts combustion efficiency, power delivery, and engine longevity. The Wiseco SVKB1409 delivers OEM-spec valves and springs engineered to handle the demands of high-RPM...09263063- SKU:
- 09263063
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- UNITS:
- KIT
$365.95Qty in Cart: 0Quantity:Price:$365.95Subtotal: -
Wiseco Valve Kit for Honda CRF450R 2013-2016 SVKB1410
WISECO
$344.95Factory valve springs fatigue under sustained high RPM operation, leading to valve float and loss of compression. The Wiseco SVKB1410 replaces worn internals with precision-matched components engineered to handle aggressive riding conditions while...09263064- SKU:
- 09263064
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Valve Kit YZ250F 2014-2018 SVKB2414
WISECO
$365.95The Wiseco Valve Kit SVKB2414 delivers OEM-quality intake and exhaust valves engineered to handle the demands of high-performance riding. Whether you're rebuilding after a top-end refresh or upgrading from worn factory components, this complete kit...09263066- SKU:
- 09263066
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$365.95 -
Wiseco Steel Valve Kit YZ450F 2003-2009 SVKB2424
WISECO
$428.95If you're running a YZ450F hard enough to need a top-end rebuild, OEM valves won't cut it. The Wiseco Steel Valve Kit SVKB2424 delivers the durability and thermal stability required for sustained high-RPM performance, while the precision-calibrated...09263067- SKU:
- 09263067
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE KIT
- UNITS:
- KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
$428.95 -
Wiseco Valve Kit Yamaha YZ450F 2014-2015 SVKB2444
WISECO
$391.95Your YZ450F's valvetrain demands precision components that can handle aggressive riding conditions without compromising reliability. The Wiseco SVKB2444 valve kit delivers OEM-equivalent quality with premium steel construction and precision-calibrated...09263069- SKU:
- 09263069
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$391.95 -
Wiseco Valve Kit Suzuki RM-Z450 2005-2006 SVKB3405
WISECO
$365.95If you're running an RM-Z450 and serious about maintaining peak engine performance, valve wear is inevitable—but premature failure doesn't have to be. The Wiseco Valve Kit SVKB3405 delivers OEM-quality intake and exhaust valves engineered to withstand...09263071- SKU:
- 09263071
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
$365.95 -
Wiseco Valve Kit 2007 Suzuki RM-Z450 SVKB3407
WISECO
$344.95If you're rebuilding or refreshing your 2007 Suzuki RM-Z450's top end, valve quality directly impacts combustion efficiency, throttle response, and engine longevity. Wiseco's SVKB3407 kit delivers OEM-spec valves and springs engineered to handle the...09263073- SKU:
- 09263073
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- APPLICATION:
- EXHAUST
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Valve Kit Suzuki RM-Z450 2008-2019 SVKB3408
WISECO
$365.95Your RM-Z450's valve train endures extreme loads with every combustion cycle—worn or marginal valves compromise power delivery and reliability. The Wiseco SVKB3408 delivers a complete OEM-grade valve kit with precision-calibrated springs engineered to...09263074- SKU:
- 09263074
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$365.95 -
Wiseco Exhaust Valve for Yamaha YFM350 Grizzly 2007-2012 VES028
WISECO
$55.95The Wiseco VES028 exhaust valve is purpose-built to handle the extreme heat and friction demands of high-performance YFM350 Grizzly engines. With factory-grade CVD or CNI surface coatings, this valve resists wear far longer than OEM components while...09262237- SKU:
- 09262237
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
$55.95 -
Wiseco Steel Intake Valve for Honda CRF70F 2004-2012 and XR70R 1997-2003 VIS022
WISECO
$21.95Your Honda CRF70F or XR70R's intake valve is working harder than OEM specs allow, especially in high-rpm racing or extended performance sessions. A worn or stock valve will compromise combustion efficiency, increase friction losses, and accelerate engine...09262242- SKU:
- 09262242
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
$21.95 -
Wiseco Steel Intake Valve for Honda XR250R 1996-2004 VIS024
WISECO
$27.95The stock intake valve in your Honda XR250R faces constant thermal stress and friction that degrades performance over time. Wiseco's VIS024 replaces worn valves with precision-engineered steel that maintains reliability whether you're trail riding or...09262243- SKU:
- 09262243
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
$27.95 -
Wiseco Steel Intake Valve Yamaha YFM350X 2006-2008 VIS028
WISECO
$38.95Stock intake valves wear under sustained high-RPM operation, leading to compression loss and performance degradation. The Wiseco VIS028 replaces that worn valve with precision-engineered construction and advanced surface treatments that resist heat and...09262245- SKU:
- 09262245
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
$38.95 -
Wiseco Exhaust Valve Honda CRF250R 2010-2015 VES036
WISECO
$55.95Exhaust valve failures compromise engine efficiency and reliability, especially in high-performance applications where heat and stress are constant threats. The Wiseco VES036 delivers precision engineering with advanced surface treatments that reduce...09261743- SKU:
- 09261743
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
$55.95
