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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On Sale
Wiseco Piston Kit 45mm Bore KTM 65 SX 1999-2008 746M04500
WISECO
MSRP: $119.95Now: $102.00Was: $119.95Transform your KTM 65 SX's performance with the Wiseco Piston Kit, engineered for enthusiasts who prioritize power and reliability. Crafted from advanced materials, this piston kit enhances your bike's capabilities, ensuring you conquer any track or...746M04500- SKU:
- 746M04500
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- STROKE LENGTH:
- 40,00 MM
- STROKE LENGTH METRIC:
- 40.00 MM
- DISPLACEMENT:
- 63,58 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
MSRP: $119.95Now: $102.00Was: $119.95Qty in Cart: 0Quantity:Price:MSRP: $119.95Now: $102.00Was: $119.95Subtotal: -
On Sale
Wiseco Piston Standard Kawasaki KX 125 1995-2008 589M05600
WISECO
MSRP: $154.95Now: $132.00Was: $154.95Elevate your Kawasaki KX125's performance with the Wiseco Piston Kit, engineered for maximum power and reliability. Designed specifically for off-road enthusiasts, this piston kit combines advanced materials with precision engineering to deliver...589M05600- SKU:
- 589M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH:
- 50,6 MM
- STROKE LENGTH METRIC:
- 50.60 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit Standard Bore 66.40mm for Suzuki RM250 2003-2008 823M06640
WISECO
MSRP: $184.95Now: $157.00Was: $184.95Elevate your riding experience with the Wiseco Piston Kit, expertly engineered for the Suzuki RM250. This high-performance kit combines cutting-edge technology with robust materials, ensuring your bike delivers exceptional power and reliability on any...823M06640- SKU:
- 823M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 249 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
MSRP: $184.95Now: $157.00Was: $184.95 -
On Sale
Wiseco Piston 66.4mm for 2003-2022 KTM 250 SX 824M06640
WISECO
MSRP: $184.95Now: $157.00Was: $184.95Elevate your dirt biking experience with the Wiseco Piston Kit 824M06640, engineered for riders who demand the best. This premium kit is crafted from high-quality materials, ensuring exceptional performance and durability even in the most challenging...824M06640- SKU:
- 824M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- STREET
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
MSRP: $184.95Now: $157.00Was: $184.95 -
On Sale
Wiseco Piston Kit 76.80mm 13.5:1 Compression Honda CRF250R 2014-2015 PK1892
WISECO
MSRP: $274.95Now: $234.00Was: $274.95Elevate your riding experience with the Wiseco Performance Piston Kit, expertly crafted for the Honda CRF250R. This kit is engineered to maximize engine performance and efficiency, making it an essential upgrade for enthusiasts seeking exceptional power...09031137- SKU:
- 09031137
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PISTON DIAMETER METRIC:
- 76.76 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 53.80 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 76.80 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- DISPLACEMENT:
- 249 CC
- SKIRT COATING:
- ARMORGLIDE®
MSRP: $274.95Now: $234.00Was: $274.95Qty in Cart: 0Quantity:Price:MSRP: $274.95Now: $234.00Was: $274.95Subtotal: -
On Sale
Wiseco Piston Kit 88mm 13:1 Compression for KTM 350EXC-F 2012-2016 PK1896
WISECO
MSRP: $319.95Now: $272.00Was: $319.95Elevate your motorcycle's performance with the Wiseco Piston Kit PK1896, engineered for enthusiasts who seek unparalleled power and efficiency. This high-performance kit is meticulously designed to optimize engine functionality, ensuring you achieve peak...09031140- SKU:
- 09031140
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 57.50 MM
- BORE SIZE METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 87.96 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 350 CC
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- TYPE:
- TOP END
MSRP: $319.95Now: $272.00Was: $319.95Qty in Cart: 0Quantity:Price:MSRP: $319.95Now: $272.00Was: $319.95Subtotal: -
On Sale
Wiseco Piston Kit with Gasket Yamaha YZ250F 2014-2015 PK1899
WISECO
MSRP: $314.95Now: $268.00Was: $314.95Transform your riding experience with the Wiseco Piston Kit, meticulously designed for Yamaha enthusiasts seeking peak performance and reliability. This kit not only enhances your engine's power but also ensures long-lasting durability, making it a...09031143- SKU:
- 09031143
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $314.95Now: $268.00Was: $314.95 -
Wiseco Circlip 17mm Honda CBR1000RR 2008-2016 CW17
WISECO
$3.00Experience unmatched strength and reliability with the WISECO Circlip CW17. Crafted from a high-silicon alloy, these circlips ensure a secure fit and easy installation with every piston. Perfect for high-performance applications, they are designed to...CW17- SKU:
- CW17
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER:
- 17 MM
- OUTSIDE DIAMETER METRIC:
- 17 MM
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- CIRCLIP
- UNITS:
- PAIR
$3.00 -
On Sale
Wiseco Cam Chain for Honda XR250R 1996-2004 CC025
WISECO
MSRP: $79.95Now: $68.00Was: $79.95Engineered for optimal performance, the WISECO Cam Chain CC025 is crafted from high-quality materials that minimize friction and enhance longevity. Its unique "M" style design ensures superior strength and reliability, making it an essential upgrade for...09250719- SKU:
- 09250719
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- CHAIN SIZE:
- 82RH2010
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- NUMBER OF LINKS:
- 102
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
MSRP: $79.95Now: $68.00Was: $79.95Qty in Cart: 0Quantity:Price:MSRP: $79.95Now: $68.00Was: $79.95Subtotal: -
On Sale
Wiseco Wrist Pin for Honda CRF110F 2013-2023 S592
WISECO
MSRP: $23.99Now: $20.00Was: $23.99The WISECO Wrist Pin S592 is engineered for superior performance and durability, designed to withstand high temperatures while maintaining structural integrity. Its advanced manufacturing process guarantees enhanced strength and reduced thermal...09130005- SKU:
- 09130005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- APPLICATION:
- PISTON
- LENGTH:
- 41,40 MM
- LENGTH METRIC:
- 41.40 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 13,00 MM
- OUTSIDE DIAMETER METRIC:
- 13.00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
MSRP: $23.99Now: $20.00Was: $23.99Qty in Cart: 0Quantity:Price:MSRP: $23.99Now: $20.00Was: $23.99Subtotal: -
On Sale
Wiseco Crankshaft Assembly with Bearings and Gasket for 2002-2018 Yamaha YZ85 WPC123
WISECO
MSRP: $339.95Now: $289.00Was: $339.95The WISECO Crankshaft with Bearing and Gasket WPC123 is engineered for high performance and durability, making it an ideal choice for enthusiasts seeking reliability in their engine builds. This comprehensive kit includes everything you need for a...09210099- SKU:
- 09210099
- Availability:
- Ships Same Business Day
- Weight:
- 6.27 LBS
- STROKE LENGTH METRIC:
- 47.80 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
MSRP: $339.95Now: $289.00Was: $339.95 -
On Sale
Wiseco Crankshaft Assembly with Bearing and Gasket for Yamaha YZ125 1998-2000 WPC124
WISECO
MSRP: $384.95Now: $327.00Was: $384.95Upgrade your engine with the WISECO Crankshaft WPC124, designed for optimal performance and reliability. This comprehensive kit includes a precision-assembled crankshaft, top-end bearing, premium main bearings, and a complete bottom-end gasket set,...09210100- SKU:
- 09210100
- Availability:
- Ships Same Business Day
- Weight:
- 8.06 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- TYPE:
- BOTTOM END
MSRP: $384.95Now: $327.00Was: $384.95Qty in Cart: 0Quantity:Price:MSRP: $384.95Now: $327.00Was: $384.95Subtotal: -
On Sale
Wiseco Crankshaft Kit for Kawasaki KX60 1985-2003 and Suzuki RM60 2003 WPC130
WISECO
MSRP: $339.95Now: $289.00Was: $339.95Upgrade your engine's performance with the WISECO Crankshaft WPC130, designed for durability and precision. This comprehensive kit includes everything you need for a complete overhaul, ensuring optimal functionality and longevity. Experience enhanced...09210103- SKU:
- 09210103
- Availability:
- Ships Same Business Day
- Weight:
- 5.92 LBS
- STROKE LENGTH METRIC:
- 41.60 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
MSRP: $339.95Now: $289.00Was: $339.95Qty in Cart: 0Quantity:Price:MSRP: $339.95Now: $289.00Was: $339.95Subtotal: -
On Sale
Wiseco Crankshaft Kit for 2002-2004 Honda CR250R WPC132
WISECO
MSRP: $459.95Now: $391.00Was: $459.95Experience unparalleled performance with the WISECO Crankshaft, expertly designed for optimal engine efficiency. This comprehensive kit includes everything you need for a complete overhaul, featuring precision-engineered components that meet OEM...09210105- SKU:
- 09210105
- Availability:
- Ships Same Business Day
- Weight:
- 12.55 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
MSRP: $459.95Now: $391.00Was: $459.95Qty in Cart: 0Quantity:Price:MSRP: $459.95Now: $391.00Was: $459.95Subtotal: -
On Sale
Wiseco Crankshaft Assembly for 1990-2002 Honda CR125R WPC116A
WISECO
MSRP: $359.95Now: $306.00Was: $359.95Experience unparalleled performance with the WISECO Crankshaft, meticulously engineered for optimal power and reliability. This comprehensive kit includes everything you need for a complete rebuild, ensuring your engine operates at peak efficiency. ...09210107- SKU:
- 09210107
- Availability:
- Ships Same Business Day
- Weight:
- 8.26 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
MSRP: $359.95Now: $306.00Was: $359.95Qty in Cart: 0Quantity:Price:MSRP: $359.95Now: $306.00Was: $359.95Subtotal: -
On Sale
Wiseco Honda CRF150R 2007-2024 Crankshaft Assembly WPC149
WISECO
MSRP: $429.95Now: $365.00Was: $429.95The WISECO Crankshaft Assembly WPC149 is engineered for optimal performance and reliability. This comprehensive kit includes everything you need for a complete rebuild, ensuring your engine operates at its best. With precision manufacturing and superior...09210148- SKU:
- 09210148
- Availability:
- Ships Same Business Day
- Weight:
- 7.11 LBS
- STROKE LENGTH METRIC:
- 43.70 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
MSRP: $429.95Now: $365.00Was: $429.95Qty in Cart: 0Quantity:Price:MSRP: $429.95Now: $365.00Was: $429.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for 1986-1991 Honda CR80R PWR115-100
WISECO
MSRP: $479.95Now: $408.00Was: $479.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR115-100, designed for both 4-stroke and 2-stroke applications. This comprehensive kit ensures optimal performance and longevity with high-quality components tailored to meet your engine's needs...09031597- SKU:
- 09031597
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
MSRP: $479.95Now: $408.00Was: $479.95Qty in Cart: 0Quantity:Price:MSRP: $479.95Now: $408.00Was: $479.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for 1992-2002 Honda CR80R PWR115-101
WISECO
MSRP: $474.95Now: $404.00Was: $474.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR115-101, designed for both 4-stroke and 2-stroke engines. This comprehensive kit includes premium components that ensure optimal performance and longevity, making it the ideal choice for...09031598- SKU:
- 09031598
- Availability:
- Ships Same Business Day
- Weight:
- 8.00 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
MSRP: $474.95Now: $404.00Was: $474.95 -
On Sale
Wiseco Engine Rebuild Kit for 1998-1999 Honda CR125R PWR116A-102
WISECO
MSRP: $549.95Now: $467.00Was: $549.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR116A-102, designed for both 4-stroke and 2-stroke applications. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring optimal performance and reliability...09031601- SKU:
- 09031601
- Availability:
- Ships Same Business Day
- Weight:
- 9.85 LBS
- BORE SIZE METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
MSRP: $549.95Now: $467.00Was: $549.95Qty in Cart: 0Quantity:Price:MSRP: $549.95Now: $467.00Was: $549.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit for 2005-2007 Suzuki RM-Z450 95.50mm PWR142-100
WISECO
MSRP: $967.84Now: $823.00Was: $967.84The WISECO Engine Rebuild Kit PWR142-100 is your all-in-one solution for a complete engine overhaul. Designed for both 4-stroke and 2-stroke engines, this kit ensures optimal performance and longevity with premium components tailored for durability and...09031614- SKU:
- 09031614
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 95.50 MM
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PRODUCT NAME:
- REBUILD KIT
MSRP: $967.84Now: $823.00Was: $967.84Qty in Cart: 0Quantity:Price:MSRP: $967.84Now: $823.00Was: $967.84Subtotal:
