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 Piston Standard Kawasaki KX 250 1992-2001 799M06640
WISECO
$184.95When you're pushing your KX 250 to the limit, your piston is doing the same. The Wiseco Standard Piston delivers the strength and precision needed to handle sustained high-RPM racing and aggressive trail riding without sacrificing reliability. Built with...799M06640- SKU:
- 799M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 249,3 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$184.95 -
Wiseco 125cc 54mm Piston Kit for KTM 125 SX 2001-2024 786M05400
WISECO
$160.95The Wiseco 786M05400 piston kit delivers the durability and precision you need to extract maximum performance from your KTM 125 SX. Built from high-silicon aluminum and E-coated for wear resistance, this complete kit keeps your engine reliable through...786M05400- SKU:
- 786M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- STROKE LENGTH:
- 54,50 MM
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit 56mm Bore Kawasaki KX125 1995-2008 783M05600
WISECO
$177.95When you're pushing a KX125 to its limits on the track, piston durability and compression integrity directly determine whether you gain an advantage or lose time to mechanical failure. The Wiseco 56mm piston kit delivers the forged strength and precision...783M05600- SKU:
- 783M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 129 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
$177.95 -
WISECO Piston - Standard - Kawasaki KX 125 783M05400
WISECO
$144.95The Wiseco 783M05400 piston delivers the reliability and sustained power output you need to stay competitive on the track or trail. Built from high-silicon forged aluminum with a structurally advanced design, this piston resists wear and detonation...783M05400- SKU:
- 783M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit Kawasaki KX 85 2001-2013 782M04850
WISECO
$132.95If you're running a KX 85 in competitive or trail racing, piston durability and horsepower output directly impact your results. Wiseco's forged high-silicon aluminum construction withstands the extreme pressures of two-stroke racing while the optimized...782M04850- SKU:
- 782M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 48.50 MM
- STROKE LENGTH:
- 45,80 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$132.95 -
Wiseco Piston Kit Yamaha WaveRunner GP1200 1997-1999 757M08500
WISECO
$159.95When your WaveRunner GP1200 demands peak performance, a compromised piston setup costs you power, reliability, and race-day confidence. The Wiseco 757M08500 piston kit delivers the durability and precision fit your 2-cycle engine needs to perform...757M08500- SKU:
- 757M08500
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 1156 CC
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 771 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$159.95 -
Wiseco Piston Kit 68.50mm for Suzuki RM 250 2000-2002 756M06850
WISECO
$224.95The Wiseco Piston Kit 68.50mm (+2.10mm oversized) is engineered for riders who demand more from their RM 250. This high-silicon aluminum forging delivers measurable gains in compression, top-end power, and durability—essential upgrades when you're...756M06850- SKU:
- 756M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 249 CC
- BORE - OVERSIZE METRIC:
- +2.10 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,10 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit 66.4mm Standard Bore for 2000-2002 Suzuki RM250 756M06640
WISECO
$184.95The Wiseco 756M06640 piston kit delivers the strength and thermal stability your RM250 needs to handle sustained high-RPM riding without compromise. Built from high-silicon alloy, this piston resists detonation and wear while maintaining precise...756M06640- SKU:
- 756M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$184.95 -
Wiseco Piston Kit 2.00 mm Oversize for Kawasaki KX 125 1995-2008 755M05600
WISECO
$182.95If you're running a KX 125 in competitive environments or demanding trail conditions, a +2.00 mm overbore piston is essential for restoring lost displacement and extracting maximum power from your engine. Wiseco's forged design delivers the strength and...755M05600- SKU:
- 755M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 134 CC
- STROKE LENGTH:
- 54,50 MM
$182.95Qty in Cart: 0Quantity:Price:$182.95Subtotal: -
Wiseco Piston Kit Standard 54mm for Suzuki RM125 2000-2003 755M05400
WISECO
$166.95When you're pushing your RM125 to its limits on the track or trail, your original piston won't cut it—you need a forged replacement engineered for the demands of serious riding. The Wiseco Piston Kit delivers measurable horsepower gains and extended...755M05400- SKU:
- 755M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
$166.95 -
Wiseco Piston +2.00 mm Suzuki RM 125 1990-2003 754M05600
WISECO
$174.95If you're pushing your RM 125 to the limit, a +2.00 mm oversized piston unlocks measurable gains in compression ratio and combustion efficiency—directly translating to stronger top-end pull and more consistent power delivery across the RPM band. Wiseco's...754M05600- SKU:
- 754M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 124,8 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit for Suzuki RM 125 2000-2003 55.50 mm 754M05550
WISECO
$177.95If you're pushing your Suzuki RM 125 to its limits on the track or trail, factory pistons won't cut it. The Wiseco +1.50 mm piston kit delivers the strength and precision needed for sustained high-RPM performance without sacrificing reliability. Built...754M05550- SKU:
- 754M05550
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 55.50 MM
- DISPLACEMENT:
- 124,8 CC
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- +1.50 MM
- STROKE LENGTH:
- 54,50 MM
- BORE - OVERSIZE:
- +1,50 MM
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
Wiseco Piston Kit 55mm Oversize for Suzuki RM125 2000-2003 754M05500
WISECO
$160.95If you're running a 2000-2003 Suzuki RM125 at the edge of its limits, a stock piston won't cut it. The Wiseco 55mm Oversize (+1.00mm) Piston Kit delivers the compression ratio and durability needed to extract real power gains while maintaining...754M05500- SKU:
- 754M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 124,8 CC
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- STROKE LENGTH:
- 54,50 MM
- BORE SIZE METRIC:
- 55.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston 54.50 mm Oversize for Suzuki RM 125 2000-2003 754M05450
WISECO
$160.95When you're pushing your RM 125 to the limit, your piston needs to match your ambition. The Wiseco 54.50 mm oversize piston delivers the strength and precision required to handle high-RPM racing demands while improving power output and engine reliability...754M05450- SKU:
- 754M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 124,8 CC
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$160.95Qty in Cart: 0Quantity:Price:$160.95Subtotal: -
Wiseco Piston Kit 46.50mm Oversize for Kawasaki KX65 2000-2009 2011-2021 752M04650
WISECO
$134.95If you're running a KX65 at the limits of stock capability, you'll hit a performance ceiling fast. The Wiseco 46.50mm oversize piston kit delivers measurable gains in horsepower and torque while maintaining the reliability needed for consistent racing...752M04650- SKU:
- 752M04650
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 46.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 64 CC
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 41,60 MM
- STROKE LENGTH METRIC:
- 41.60 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit Standard 44.5mm Bore 2000-2025 Kawasaki KX65 Suzuki RM65 752M04450
WISECO
$128.95When you're pushing your KX65 or RM65 to the limit on the track, your piston needs to handle extreme combustion pressures and sustained RPMs without compromise. The Wiseco Piston Kit delivers the durability and power output you need to stay competitive,...752M04450- SKU:
- 752M04450
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- STROKE LENGTH:
- 41,60 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- UNITS:
- EACH
$128.95Qty in Cart: 0Quantity:Price:$128.95Subtotal: -
Wiseco Piston +2.00 mm Gas Gas MC 125 2002-2025 726M05600
WISECO
$179.95If you're pushing your Gas Gas MC 125 to its limits, a worn or stock piston will hold you back. The Wiseco +2.00 mm piston delivers the compression ratio and durability you need to extract maximum horsepower while maintaining reliability through intense...726M05600- SKU:
- 726M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- STROKE LENGTH:
- 54,50 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit Yamaha YZ 125 2005-2021 56mm 726M05500
WISECO
$154.95When you're pushing your YZ 125 to its limits, factory pistons become the limiting factor. The Wiseco +1.00mm piston kit delivers the compression ratio and durability you need to extract reliable horsepower gains without sacrificing longevity—whether...726M05500- SKU:
- 726M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- STROKE LENGTH:
- 54,50 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 1.00 mm Oversize for Yamaha YZ 250 1999-2022 677M06900
WISECO
$210.95If you're running a YZ 250 in competitive trail or race conditions, a worn or stock piston limits your engine's potential for power and reliability. The Wiseco +1.00 mm piston kit delivers the compression increase and durability you need to extract...677M06900- SKU:
- 677M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 68.00 MM
- DISPLACEMENT:
- 246,8 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 68,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$210.95 -
Wiseco Piston Kit Yamaha YZ250 1999-2001 804M06640
WISECO
$199.95If you're pushing your YZ250 or WR250 to the limit, factory pistons won't cut it. The Wiseco High-Performance Piston Kit delivers the durability and power output serious racers demand, with advanced materials and coatings engineered to withstand...677M06800- SKU:
- 677M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 68.00 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 246,8 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 68.00 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal:
