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
-
On Sale
VERTEX Piston Kit 24119B
VERTEX
MSRP: $218.95Now: $197.06Was: $218.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09104084- SKU:
- 09104084
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $218.95Now: $197.06Was: $218.95Qty in Cart: 0Quantity:Price:MSRP: $218.95Now: $197.06Was: $218.95Subtotal: -
On Sale
VERTEX Piston Kit 24119C
VERTEX
MSRP: $191.95Now: $172.76Was: $191.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09104085- SKU:
- 09104085
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $191.95Now: $172.76Was: $191.95Qty in Cart: 0Quantity:Price:MSRP: $191.95Now: $172.76Was: $191.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 24123C
VERTEX
MSRP: $138.95Now: $125.06Was: $138.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09104102- SKU:
- 09104102
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON DIAMETER METRIC:
- 76.97 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $138.95Now: $125.06Was: $138.95Qty in Cart: 0Quantity:Price:MSRP: $138.95Now: $125.06Was: $138.95Subtotal: -
On Sale
VERTEX Piston Kit 24105A
VERTEX
MSRP: $71.95Now: $64.76Was: $71.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09104134- SKU:
- 09104134
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- CYLINDER DIAMETER METRIC:
- 39.00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 50 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 38.94 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
MSRP: $71.95Now: $64.76Was: $71.95Qty in Cart: 0Quantity:Price:MSRP: $71.95Now: $64.76Was: $71.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression VTKTC23236C
VERTEX
MSRP: $342.95Now: $308.66Was: $342.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103747- SKU:
- 09103747
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
MSRP: $342.95Now: $308.66Was: $342.95Qty in Cart: 0Quantity:Price:MSRP: $342.95Now: $308.66Was: $342.95Subtotal: -
On Sale
VERTEX Piston Kit VTKTC23259B
VERTEX
MSRP: $314.95Now: $283.46Was: $314.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103751- SKU:
- 09103751
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
MSRP: $314.95Now: $283.46Was: $314.95 -
On Sale
VERTEX Piston Kit VTKTC23443B
VERTEX
MSRP: $321.95Now: $289.76Was: $321.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103761- SKU:
- 09103761
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
MSRP: $321.95Now: $289.76Was: $321.95Qty in Cart: 0Quantity:Price:MSRP: $321.95Now: $289.76Was: $321.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression VTKTC23647B
VERTEX
MSRP: $313.95Now: $282.56Was: $313.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103800- SKU:
- 09103800
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
MSRP: $313.95Now: $282.56Was: $313.95Qty in Cart: 0Quantity:Price:MSRP: $313.95Now: $282.56Was: $313.95Subtotal: -
On Sale
VERTEX Piston Kit 23711B
VERTEX
MSRP: $302.95Now: $272.66Was: $302.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102594- SKU:
- 09102594
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
MSRP: $302.95Now: $272.66Was: $302.95 -
On Sale
VERTEX Piston Circlips - 4-Stroke 72090K
VERTEX
MSRP: $3.95Now: $3.56Was: $3.95OEM Replacements for Vertex piston kits.09130060- SKU:
- 09130060
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
- PRODUCT NAME:
- CIRCLIP
- UNITS:
- PAIR
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
MSRP: $3.95Now: $3.56Was: $3.95 -
On Sale
VERTEX Piston Kit - Standard 22983B
VERTEX
MSRP: $242.95Now: $218.66Was: $242.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09101043- SKU:
- 09101043
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
MSRP: $242.95Now: $218.66Was: $242.95 -
On Sale
Wiseco Piston Kit for Honda CR250M 1975-1976 338M07000
WISECO
MSRP: $199.95Now: $170.00Was: $199.95Wiseco 338M07000 Piston Kit Transform your riding experience with the Wiseco 338M07000 Piston Kit, expertly designed for high-performance 2-stroke engines. This kit not only enhances power and efficiency but also ensures exceptional durability for both...338M07000- SKU:
- 338M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- UTV
- DISPLACEMENT:
- 248 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.40 MM
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit 2mm Oversize for 1975-1977 Honda CR250M 338M07200
WISECO
MSRP: $224.95Now: $191.00Was: $224.95Wiseco 338M07200 Piston Kit Elevate your ride with the Wiseco 338M07200 Piston Kit, expertly engineered to maximize the performance of your 2-stroke engine. This piston kit combines advanced materials and precision craftsmanship, ensuring unparalleled...338M07200- SKU:
- 338M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 248 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- UTV
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 71.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 72.00 MM
- STROKE LENGTH METRIC:
- 64.40 MM
MSRP: $224.95Now: $191.00Was: $224.95Qty in Cart: 0Quantity:Price:MSRP: $224.95Now: $191.00Was: $224.95Subtotal: -
On Sale
Wiseco Piston Kit 78mm 14.5:1 Compression Gas Gas EX 250F 2022 RE804M07800
WISECO
MSRP: $369.95Now: $314.00Was: $369.95Wiseco RE804M07800 Piston Kit Elevate your dirt bike's performance with the Wiseco RE804M07800 Piston Kit, specifically crafted for 4-stroke engines. This high-performance piston kit combines advanced engineering with top-tier materials, ensuring you...09105073- SKU:
- 09105073
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
MSRP: $369.95Now: $314.00Was: $369.95Qty in Cart: 0Quantity:Price:MSRP: $369.95Now: $314.00Was: $369.95Subtotal: -
On Sale
Wiseco 2-Stroke Piston Kit 47.5mm Honda CR85R 2003-2007 RE921M04750
WISECO
MSRP: $159.95Now: $136.00Was: $159.95Wiseco RE921M04750 Piston Kit Transform your riding experience with the Wiseco RE921M04750 Piston Kit, meticulously engineered for 2-stroke Honda CR85R models (2003-2007). This piston kit combines cutting-edge technology with robust materials to deliver...09105077- SKU:
- 09105077
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
MSRP: $159.95Now: $136.00Was: $159.95Qty in Cart: 0Quantity:Price:MSRP: $159.95Now: $136.00Was: $159.95Subtotal: -
On Sale
Wiseco Piston Kit 80mm 10.5:1 Compression for Suzuki DR350 1990-1999 4576M08000
WISECO
MSRP: $174.95Now: $149.00Was: $174.95Wiseco 4576M08000 Piston Kit Transform your dirt bike's performance with the Wiseco 4576M08000 Piston Kit, engineered specifically for 4-stroke engines. This piston kit guarantees enhanced power delivery and reliability, making it an ideal choice for...4576M08000- SKU:
- 4576M08000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 79.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 80.00 MM
- DISPLACEMENT:
- 349 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 71.20 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $174.95Now: $149.00Was: $174.95Qty in Cart: 0Quantity:Price:MSRP: $174.95Now: $149.00Was: $174.95Subtotal: -
On Sale
Wiseco Piston Kit 2.00mm Oversize 52.95mm Yamaha YZ80 1976-1980 457M05100
WISECO
MSRP: $144.95Now: $123.00Was: $144.95Wiseco 457M05100 Piston Kit Elevate your dirt bike's performance with the Wiseco 457M05100 Piston Kit, meticulously crafted for 2-stroke engines. This piston kit combines advanced engineering and high-quality materials to deliver unmatched reliability...457M05100- SKU:
- 457M05100
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 50.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 51.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
MSRP: $144.95Now: $123.00Was: $144.95Qty in Cart: 0Quantity:Price:MSRP: $144.95Now: $123.00Was: $144.95Subtotal: -
On Sale
Wiseco Piston Kit 49.50mm Honda CR85R 2003-2006 PK1217
WISECO
MSRP: $184.95Now: $157.00Was: $184.95Wiseco PK1217 Piston Kit Elevate your dirt bike's performance with the Wiseco PK1217 Piston Kit, expertly engineered for 2-stroke engines. This premium kit is designed for riders seeking unmatched power and reliability, ensuring you conquer any terrain...09030175- SKU:
- 09030175
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 84.7 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 49.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 49.45 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
MSRP: $184.95Now: $157.00Was: $184.95 -
On Sale
Wiseco YZ125 2001 Piston Kit with Gaskets 56mm PK1351
WISECO
MSRP: $234.95Now: $200.00Was: $234.95Wiseco PK1351 Piston Kit Elevate your Yamaha YZ125's performance with the Wiseco PK1351 Piston Kit, expertly engineered for 2-stroke engines. This kit combines cutting-edge technology with robust materials to ensure your bike delivers peak power and...09030176- SKU:
- 09030176
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $234.95Now: $200.00Was: $234.95Qty in Cart: 0Quantity:Price:MSRP: $234.95Now: $200.00Was: $234.95Subtotal: -
On Sale
Wiseco Honda XR200R 1992-2002 Piston Kit with Gaskets PK1124
WISECO
MSRP: $204.95Now: $174.00Was: $204.95Wiseco PK1124 Piston Kit Elevate your Honda XR200R's performance with the Wiseco PK1124 Piston Kit, engineered for exceptional power and reliability. This precision-crafted kit is perfect for riders looking to enhance their bike's capabilities, whether...09030212- SKU:
- 09030212
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 192 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON DIAMETER METRIC:
- 65.45 MM
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 65.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $204.95Now: $174.00Was: $204.95Qty in Cart: 0Quantity:Price:MSRP: $204.95Now: $174.00Was: $204.95Subtotal:
