Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
Wiseco Engine Rebuild Kit for 2006 Kawasaki KX250F PWR144-101
WISECO
$932.95A top-end and bottom-end rebuild kit gives you a complete, factory-engineered solution when your KX250F demands more than patchwork repairs. The Wiseco PWR144-101 delivers OEM-quality components—crankshaft, rod, bearings, and seals—all tuned for the...09031532- SKU:
- 09031532
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
$932.95 -
Wiseco Engine Rebuild Kit for Kawasaki KX250F 2007-2008 PWR144-102
WISECO
$932.95When your KX250F's engine reaches the end of its service life, a complete rebuild restores it to factory specifications without the cost of replacement. The Wiseco PWR144-102 kit supplies all critical components—pistons, rings, bearings, seals, and...09031533- SKU:
- 09031533
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
$932.95 -
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 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 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 -
Wiseco Steel Intake Valve for KTM 525 XC 2008-2010 VIS035
WISECO
$43.95The Wiseco Steel Intake Valve VIS035 is engineered to deliver extended valve lifespan and reliable performance under the demanding conditions of high-RPM racing and aggressive riding. Its advanced surface treatment significantly reduces wear and...09261749- SKU:
- 09261749
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
$43.95 -
Wiseco Exhaust Valve for Honda CRF250R 2004-2007 VES001
WISECO
$49.95Factory exhaust valves wear quickly under aggressive riding conditions, leading to compression loss and declining performance. The Wiseco VES001 replaces worn valves with a precision-engineered component featuring advanced surface treatments that resist...09260257- SKU:
- 09260257
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$49.95 -
Wiseco Exhaust Valve for Honda CRF450R 2002-2006 VES002
WISECO
$49.95If you're running a CRF450R at the edge of its limits—whether on the track or in the dirt—valve wear is a silent performance killer. The Wiseco VES002 exhaust valve eliminates that vulnerability with advanced surface treatments that cut friction, resist...09260258- SKU:
- 09260258
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$49.95 -
Wiseco Exhaust Valve for 1993-2000 Honda XR600R VES004
WISECO
$66.95The Wiseco Exhaust Valve VES004 is engineered to withstand the extreme thermal and mechanical demands of high-performance riding. If you're pushing your XR600R to its limits, a worn or failing exhaust valve will cost you horsepower, reliability, and...09260260- SKU:
- 09260260
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$66.95 -
Wiseco Ring Set 70.50mm Honda ATC250R 1981-1984 2776CD
WISECO
$52.95Keep your ATC250R running strong with a proper ring set replacement. Worn rings compromise compression, increase oil consumption, and rob you of the power your engine is capable of producing. The Wiseco 2776CD delivers the precision fit and durability...2776CD- SKU:
- 2776CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- UTV
- UNITS:
- SET
- BORE SIZE METRIC:
- 70.50 MM
- DISPLACEMENT:
- 248 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco Ring Set 70.50mm Ski-Doo Grand Touring 500 2001 2776CS
WISECO
$25.95A worn or damaged ring set compromises combustion efficiency, increases oil consumption, and robs your Grand Touring 500 of power—the Wiseco 2776CS restores proper compression and sealing for consistent performance. This precision-engineered ring set is...2776CS- SKU:
- 2776CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 70.50 MM
- DISPLACEMENT:
- 514 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- SNOW
- UNITS:
- SET
$25.95
