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
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Wiseco Cam Chain Kawasaki KX450F 2006-2008 KLX450R 2008-2021 CC019
WISECO
$108.95Your KX450F or KLX450R's cam chain is the backbone of reliable valve timing—and a worn or failing unit can quickly cascade into catastrophic engine damage. The Wiseco CC019 replaces factory chains with precision-engineered strength, reducing friction and...09250319- SKU:
- 09250319
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- NUMBER OF LINKS:
- 124
- RIDING STYLE:
- STREET
- CHAIN SIZE:
- 98XRH2010
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- UNITS:
- EACH
$108.95 -
Wiseco Wrist Pin 19mm OD 47.5mm L Honda CRF450R 2009-2016 S682
WISECO
$25.95The Wiseco S682 wrist pin is engineered to handle the extreme loads and thermal stress of high-RPM racing engines. If you're building or rebuilding a CRF450R, this precision-machined component ensures reliable piston-to-rod articulation under sustained...09130012- SKU:
- 09130012
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- OUTSIDE DIAMETER METRIC:
- 19.00 MM
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 19,00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 62,1 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- LENGTH METRIC:
- 62.1 MM
- UNITS:
- EACH
$25.95 -
Wiseco Crankshaft Kit Yamaha YZ125 2005-2021 WPC163
WISECO
$421.95A worn or damaged crankshaft compromises the entire bottom end of your YZ125, directly affecting power delivery, reliability, and longevity. The Wiseco WPC163 kit eliminates guesswork by combining a factory-assembled crankshaft, precision bearings, and...09210549- SKU:
- 09210549
- Availability:
- Ships Same Business Day
- Weight:
- 7.95 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$421.95 -
Wiseco Crankshaft Kit Kawasaki KX85 2006-2013 WPC164
WISECO
$332.95A worn or damaged crankshaft directly compromises engine reliability, power delivery, and longevity—especially critical in high-RPM racing applications. The Wiseco WPC164 delivers a factory-assembled, precision-engineered solution that restores your KX85...09210550- SKU:
- 09210550
- Availability:
- Ships Same Business Day
- Weight:
- 6.25 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
$332.95 -
Wiseco Engine Rebuild Kit 52.00mm Bore for 2006-2011 KTM 105 SX PWR176-100
WISECO
$588.95When your KTM 105 SX's engine shows signs of wear, a complete rebuild using OEM-quality components is the only way to restore full performance and reliability. The Wiseco PWR176-100 kit delivers all the precision-engineered parts you need—piston,...09031622- SKU:
- 09031622
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$588.95 -
Wiseco Engine Rebuild Kit for Honda CR125R 2005-2007 54mm Bore PWR177-100
WISECO
$588.95When your Honda CR125R 2005-2007 shows signs of wear—loss of compression, decreased power delivery, or visible piston scoring—a complete engine rebuild is the most cost-effective path to restoring full performance. The Wiseco PWR177-100 kit delivers...09031623- SKU:
- 09031623
- Availability:
- Ships Same Business Day
- Weight:
- 9.95 LBS
- BORE SIZE METRIC:
- 54.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- PRODUCT NAME:
- REBUILD KIT
$588.95 -
Wiseco Engine Kit Kawasaki KX100 2006 PWR164-100
WISECO
$555.95A top and bottom-end rebuild is the most cost-effective way to restore your KX100 to factory performance specifications. The Wiseco Engine Kit eliminates the guesswork of sourcing individual components by bundling everything you need for a complete...09031542- SKU:
- 09031542
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 52.50 MM
- DISPLACEMENT:
- 100 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- ENGINE
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$555.95 -
Wiseco Engine Rebuild Kit for 2010-2013 Honda CRF250R PWR168-100
WISECO
$877.95When your CRF250's engine reaches the end of its service life, a complete rebuild restores original performance and reliability without the cost of a full replacement. The Wiseco Engine Rebuild Kit supplies every critical component needed for a thorough...09031546- SKU:
- 09031546
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$877.95 -
Wiseco Engine Rebuild Kit for 2005-2007 Honda CR250R PWR172-100
WISECO
$721.95A worn or damaged engine demands a complete rebuild, not a patch job. The Wiseco Engine Rebuild Kit for 2005-2007 Honda CRF250R delivers every critical component you need in one package—crankshaft, rod assembly, bearings, seals, and gaskets—all...09031548- SKU:
- 09031548
- Availability:
- Ships Same Business Day
- Weight:
- 13.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- GP SERIES PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$721.95 -
Wiseco Steel Exhaust Valve Honda CRF250R 2008-2009 VES023
WISECO
$49.95Stock exhaust valves are a limiting factor in high-revving performance builds—they wear prematurely and struggle with sustained heat. The Wiseco Steel Exhaust Valve VES023 delivers the durability and thermal stability your CRF250R needs to handle...09262234- SKU:
- 09262234
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
$49.95 -
Wiseco Honda XR250R 1996-2004 Exhaust Valve VES024
WISECO
$38.95If you're running your XR250R hard—whether on the track or the trail—exhaust valve wear is inevitable without proper materials engineered to handle extreme heat and friction. The Wiseco VES024 combats this with advanced CVD/CNI surface treatments that...09262235- SKU:
- 09262235
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$38.95 -
Wiseco Exhaust Valve for Suzuki DR-Z400S 2000-2024 VES009
WISECO
$43.95The Wiseco Exhaust Valve VES009 is purpose-built for the Suzuki DR-Z400S to deliver reliable performance across thousands of operating hours. Engineered with advanced surface treatments, this valve resists thermal stress and wear far better than OEM...09260262- SKU:
- 09260262
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
$43.95 -
Wiseco Intake Valve for Kawasaki KFX400 2003-2005 and Suzuki DR-Z400S 2000-2020 VIS009
WISECO
$38.95Factory intake valves wear down under sustained high RPM operation, leading to decreased airflow efficiency and compression loss. The Wiseco VIS009 addresses this with surface treatments that dramatically reduce friction while withstanding extreme heat,...09260276- SKU:
- 09260276
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$38.95 -
Wiseco 2-Stroke Piston Ring Set 68.25mm 1986-1989 Honda TRX250R 2687CD
WISECO
$52.95If you're running a Honda TRX250R, worn or damaged piston rings directly compromise compression, increase oil consumption, and rob you of the power you've built into your engine. The Wiseco 2687CD ring set restores proper sealing and friction...2687CD- SKU:
- 2687CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- BORE SIZE METRIC:
- 68.25 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 436 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco Ring Set 68.50mm Honda TRX250R 1986-1989 2697CD
WISECO
$52.95If you're rebuilding a Honda TRX250R engine or upgrading your piston assembly, ring seal quality directly impacts compression, blow-by, and power delivery. The Wiseco 2697CD ring set is precision-manufactured to match Wiseco piston specifications,...2697CD- SKU:
- 2697CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 436 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 68.50 MM
- RIDING STYLE:
- SNOW
- UNITS:
- SET
$52.95 -
Wiseco 2-Stroke Piston Ring Set 67mm Bore Honda CR250R 1984-2001 2638CD
WISECO
$52.95Ring wear is one of the fastest killers of 2-stroke performance—loss of compression means loss of power, throttle response, and fuel efficiency. The Wiseco 2638CD Ring Set is precision-engineered specifically for the Honda CR250R, delivering the exact...2638CD- SKU:
- 2638CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 195 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 171 CC
- UNITS:
- SET
$52.95 -
Wiseco Ring Set 50mm Kawasaki KE100 1976-2000 1969CD
WISECO
$52.95Piston ring sets are critical to engine longevity and performance—they maintain compression, prevent blow-by, and control oil consumption. If you're rebuilding a Kawasaki KE100 or upgrading to a higher-displacement piston, the Wiseco 1969CD ring set...1969CD- SKU:
- 1969CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 50.00 MM
- DISPLACEMENT:
- 79,7 CC
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
$52.95 -
Wiseco Piston Kit with Gaskets 56mm Kawasaki KX125 2001-2002 PK1503
WISECO
$239.95A worn or damaged piston compromises your KX125's power delivery and engine reliability—especially critical for a 2-stroke where combustion efficiency directly impacts performance. The Wiseco Piston Kit gives you a complete top-end solution with...09030698- SKU:
- 09030698
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$239.95 -
Wiseco Piston Kit Yamaha YZ125 2002-2004 797M05450
WISECO
$144.95If you're running a 2002-2004 YZ125, piston wear directly impacts your engine's power delivery, fuel efficiency, and reliability. Wiseco's forged-aluminum construction handles the high RPMs and thermal stress of both trail and competition riding, giving...09101240- SKU:
- 09101240
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$144.95 -
Wiseco Piston Kit 54mm for Yamaha YZ125 2005-2021 PK1571
WISECO
$212.95When you're pushing a YZ125 to its limits on the track or trail, your piston kit needs to handle extreme combustion pressures and temperature swings without compromise. Wiseco's forged-from-bar-stock construction delivers the strength and thermal...09030724- SKU:
- 09030724
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 53.95 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$212.95
