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 Piston Kit with Gaskets for Kawasaki KX250 2007-2008 PK1598
WISECO
$307.95If you're rebuilding a KX250F or pushing your engine to its limits, piston quality directly impacts reliability and power output. The Wiseco PK1598 delivers forged aluminum construction that handles...09030932- SKU:
- 09030932
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
$307.95 -
Wiseco Piston Kit 47mm 10.5:1 Compression for Honda CRF70F 2004-2012 PK1729
WISECO
$182.95If you're running a CRF70F and want measurable gains in power and throttle response, the Wiseco PK1729 piston kit delivers the compression ratio and engineering precision needed to unlock your bike's...09030933- SKU:
- 09030933
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON DIAMETER METRIC:
- 46.97 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE SIZE METRIC:
- 47.00 MM
- MODEL:
- FORGED SERIES
$182.95 -
Wiseco Piston Kit for Kawasaki KX450F 2009-2012 13.5:1 Compression PK1840
WISECO
$339.95If you're running a 2009-2012 Kawasaki KX450F at the edge of its limits, piston failure isn't a question of if—it's when. The Wiseco PK1840 raises your compression ratio to 13.5:1, unlocking...09030935- SKU:
- 09030935
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 95.95 MM
- SKIRT COATING:
- ARMORGLIDE®
$339.95Qty in Cart: 0Quantity:Price:$339.95Subtotal: -
Wiseco Piston Kit Yamaha YZ250F 2008-2011 PK1844
WISECO
$309.95A worn or failing piston directly compromises engine performance, reliability, and your race results. The Wiseco PK1844 restores—and exceeds—OEM specifications with aerospace-grade forged aluminum...09030937- SKU:
- 09030937
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON DIAMETER METRIC:
- 76.95 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- KIT
$309.95Qty in Cart: 0Quantity:Price:$309.95Subtotal: -
Wiseco Piston Kit with Gaskets for Yamaha YZ250F 2008-2011 PK1845
WISECO
$344.95A top-end rebuild is essential for maintaining peak performance in your YZ250F, and the Wiseco PK1845 kit delivers everything needed in one complete package. This precision-forged piston and gasket...09030938- SKU:
- 09030938
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- PISTON DIAMETER METRIC:
- 76.95 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Piston Kit for Kawasaki KX250F 2011-2014 77mm 13.5:1 Compression PK1879
WISECO
$299.95A top-end rebuild is critical for maintaining peak performance in your KX250F, and Wiseco's precision-forged pistons deliver the durability and power consistency you need for consistent lap times...09030941- SKU:
- 09030941
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
- PISTON DIAMETER METRIC:
- 76.96 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
$299.95Qty in Cart: 0Quantity:Price:$299.95Subtotal: -
Wiseco KX250F 2011-2014 Piston Kit with Gaskets PK1880
WISECO
$339.95The stock piston in your KX250F limits your engine's potential. Wiseco's PK1880 kit delivers measurable gains in compression ratio and throttle response while the ArmorGlide skirt coating extends...09030942- SKU:
- 09030942
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
$339.95Qty in Cart: 0Quantity:Price:$339.95Subtotal: -
Wiseco Piston Kit 56mm 2mm Oversize Kawasaki KX125 1998 719M05600
WISECO
$179.95If you're running a 1998 Kawasaki KX125 and want measurable gains in throttle response and engine durability, a quality piston kit is non-negotiable. The Wiseco 719M05600 delivers the precision...719M05600- SKU:
- 719M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit Sea-Doo 3D 947 DI 2006-2007 716M08850
WISECO
$166.10If you're running a Sea-Doo 3D 947 DI, piston wear directly impacts power delivery, fuel efficiency, and engine longevity. The Wiseco 716M08850 piston kit restores lost compression and responsiveness...716M08850- SKU:
- 716M08850
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 88.50 MM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 960 CC
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- WATERCRAFT
$166.10 -
Wiseco Piston Kit 89mm for Sea-Doo GSX Limited 1998-1999 716M08900
WISECO
$174.95Worn or damaged pistons compromise combustion efficiency, throttle response, and engine longevity—especially in high-performance applications. The Wiseco 89mm Piston Kit is engineered to restore and...716M08900- SKU:
- 716M08900
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 89.00 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 971 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
$174.95 -
Wiseco Piston Kit 56mm Bore Kawasaki KX125 1986 741M05600
WISECO
$179.95OEM pistons wear down with regular use, losing compression and throttle response over time. The Wiseco 56mm Piston Kit restores your KX125 to peak performance with precision engineering and...741M05600- SKU:
- 741M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit 66.40mm Standard Bore Suzuki RM250 1999 743M06640
WISECO
$199.95Worn or stock pistons limit your RM250's potential, sacrificing throttle response and peak power when you need it most. The Wiseco 66.40mm piston kit restores combustion efficiency with precision...743M06640- SKU:
- 743M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 2025 KTM 65 SX 2.00mm Oversize 746M04700
WISECO
$134.95The Wiseco Piston Kit delivers the reliability and precision your KTM 65 SX demands, whether you're chasing podium finishes or pushing limits on the trail. A 2.00mm oversize bore maximizes...746M04700- SKU:
- 746M04700
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- DISPLACEMENT:
- 63,58 CC
- STROKE LENGTH:
- 40,00 MM
- STROKE LENGTH METRIC:
- 40.00 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 47.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 78mm Bore KTM 380 SX 1998-2002 748M07800
WISECO
$243.95If you're running a KTM 380 SX or EXC, the factory piston won't cut it if you're serious about trail performance or track reliability. A quality piston kit like this Wiseco directly impacts throttle...748M07800- SKU:
- 748M07800
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 77,00 MM
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 368 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 77.00 MM
- UNITS:
- EACH
$243.95 -
Wiseco Piston Kit 79mm Bore 1998-2002 KTM 380 SX 748M07900
WISECO
$243.95Stock pistons in your KTM 380 SX reach their limits under aggressive riding and high-RPM demands. The Wiseco 79mm piston kit delivers the strength and precision your engine needs to maintain...748M07900- SKU:
- 748M07900
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 368 CC
- STROKE LENGTH METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 77,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 79.00 MM
- PISTON MATERIAL:
- FORGED
$243.95 -
Wiseco Piston Standard Yamaha YZ 125 1998-2001 726M05400
WISECO
$154.95When you're pushing your YZ 125 to the limit, your piston is doing the hardest work in the engine—and a worn or damaged one will cost you power, reliability, and race results. The Wiseco 726M05400 is...726M05400- SKU:
- 726M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston +0.50 mm Yamaha YZ 125 2000-2025 726M05450
WISECO
$154.95If you're running a YZ125 at the limit, piston wear and clearance issues will kill your power delivery and throttle response. The Wiseco +0.50mm piston restores compression and combustion efficiency...726M05450- SKU:
- 726M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- STROKE LENGTH:
- 54,50 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 54mm for Suzuki RM125 1989-1999 641M05400
WISECO
$162.95If you're rebuilding a RM125 or chasing more responsive power delivery, a quality piston kit is non-negotiable. Wiseco's 54mm design delivers the precision fit and lightweight construction that...641M05400- SKU:
- 641M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$162.95 -
Wiseco Piston Kit 54.50 mm Suzuki RM125 1989-1999 641M05450
WISECO
$162.95If you're running a Suzuki RM125 from the '89–'99 generation, a worn or stock piston is costing you power and throttle response. The Wiseco Piston Kit delivers the precision engineering and material...641M05450- SKU:
- 641M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 54.50 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 54,00 MM
$162.95 -
Wiseco Piston +1.00 mm Suzuki RM 125 1989-1999 641M05500
WISECO
$154.95If you're running a Suzuki RM125 and want to unlock real gains in power and throttle response, a properly sized piston is where it starts. Wiseco's +1.00mm oversized piston delivers the durability...641M05500- SKU:
- 641M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 123 CC
- ENGINE TYPE:
- 2-STROKE
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal:
