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!
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- Price
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On Sale
VESRAH Oil Filter - Kawasaki/Suzuki SF-3012
VESRAH
MSRP: $7.00Now: $6.65Was: $7.00Engine protection hinges on filtration quality—contamination and particle buildup reduce oil flow, increase wear, and shorten engine life. The VESRAH SF-3012 uses premium filter media to capture...07120026- SKU:
- 07120026
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $7.00Now: $6.65Was: $7.00Qty in Cart: 0Quantity:Price:MSRP: $7.00Now: $6.65Was: $7.00Subtotal: -
On Sale
Wiseco Wrist Pin for 1987-1989 Honda TRX250R S482
WISECO
MSRP: $22.99Now: $20.00Was: $22.99The wrist pin is a critical stress point in any high-revving engine, and OEM pins often become a reliability bottleneck when you start pushing performance. Wiseco's S482 wrist pin delivers the...S482- SKU:
- S482
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $22.99Now: $20.00Was: $22.99Qty in Cart: 0Quantity:Price:MSRP: $22.99Now: $20.00Was: $22.99Subtotal: -
On Sale
Wiseco Piston Kit 54.00 mm KTM 125 SX 2001-2024 RE904M05400
WISECO
MSRP: $221.95Now: $174.00Was: $221.95KTM 125 SX engines demand precision internals to handle the demands of competitive riding and high-RPM operation. This Wiseco piston kit delivers the durability and reliability you need to keep your...09105086- SKU:
- 09105086
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit 68.50mm Yamaha YZ250 2002-2020 560M06850
WISECO
MSRP: $219.95Now: $170.00Was: $219.95The Wiseco 68.50mm piston kit restores your YZ250 to factory specifications while delivering the durability and compression needed for consistent high-RPM performance on the track or trail. Factory...560M06850- SKU:
- 560M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
MSRP: $219.95Now: $170.00Was: $219.95 -
On Sale
Wiseco Piston Kit 95mm for KTM 520 EXC 2000-2002 PK1851
WISECO
MSRP: $403.95Now: $314.00Was: $403.95A worn or damaged piston kit will rob your KTM 520 EXC of power, efficiency, and reliability—especially if you're pushing hard on the track or trail. This Wiseco PK1851 kit gives you factory-matched...09031162- SKU:
- 09031162
- Availability:
- Ships Same Business Day
- Weight:
- 1.84 LBS
MSRP: $403.95Now: $314.00Was: $403.95 -
On Sale
Wiseco Engine Rebuild Kit 52.50 mm Kawasaki KX100 1995-2013 PWR173-100
WISECO
MSRP: $588.95Now: $484.00Was: $588.95A worn or damaged KX100 engine doesn't just rob you of power—it compromises reliability when you need it most. The Wiseco PWR173-100 rebuild kit gives you factory-engineered components designed to...09031681- SKU:
- 09031681
- Availability:
- Ships Same Business Day
- Weight:
- 7.85 LBS
MSRP: $588.95Now: $484.00Was: $588.95 -
On Sale
Wiseco Piston Kit 77.00mm Kawasaki KX250F 2006 13.5:1 Compression 4904M07700
WISECO
MSRP: $224.95Now: $191.00Was: $224.95A worn or damaged piston directly kills engine efficiency and can lead to catastrophic failure under load—especially critical for KX250F riders pushing their bikes hard on track or trail. Wiseco's...09101670- SKU:
- 09101670
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
MSRP: $224.95Now: $191.00Was: $224.95Qty in Cart: 0Quantity:Price:MSRP: $224.95Now: $191.00Was: $224.95Subtotal: -
On Sale
WISECO Piston Kit with Gaskets - 68.00 mm - Yamaha WR/YZ 250 PK1563
WISECO
MSRP: $275.95Now: $221.00Was: $275.95A worn or damaged top-end forces catastrophic engine failure and sidelined race time. The WISECO Piston Kit delivers OEM-quality reliability with precision-engineered components matched specifically...09030716- SKU:
- 09030716
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
MSRP: $275.95Now: $221.00Was: $275.95 -
On Sale
Wiseco Piston Kit 95.00 mm Yamaha YFZ450R 2009-2019 RE819M09500
WISECO
MSRP: $243.95Now: $204.00Was: $243.95When you're running stock pistons in your YFZ450R, you're leaving horsepower on the table and risking catastrophic engine failure under sustained load or aggressive riding. The Wiseco 95.00 mm forged...09100373- SKU:
- 09100373
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $243.95Now: $204.00Was: $243.95 -
On Sale
Wiseco Piston Kit 92.00 mm Honda XR500R 1983-1984 4330M09200
WISECO
MSRP: $239.95Now: $204.00Was: $239.95The OEM piston in your Honda XR500R experiences wear and heat stress that limits performance and reliability over time. A forged replacement kit restores compression, throttle response, and engine...09102903- SKU:
- 09102903
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
MSRP: $239.95Now: $204.00Was: $239.95Qty in Cart: 0Quantity:Price:MSRP: $239.95Now: $204.00Was: $239.95Subtotal: -
On Sale
Wiseco Piston Kit 72.00 mm Suzuki TM250 1972-1975 380M07200
WISECO
MSRP: $224.95Now: $191.00Was: $224.95The stock piston in your Suzuki TM250 is a wear item—and when it fails, you're looking at catastrophic engine damage. This Wiseco piston kit replaces the entire upper-end assembly with forged...380M07200- SKU:
- 380M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $224.95Now: $191.00Was: $224.95Qty in Cart: 0Quantity:Price:MSRP: $224.95Now: $191.00Was: $224.95Subtotal: -
WORKS CONNECTION Engine Plug - Blue - Gas Gas/Husqvarna/KTM 24-450
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and deterioration, compromising both aesthetics and reliability on your high-performance machine. These WORKS CONNECTION plugs deliver the precision fit and...09500977- SKU:
- 09500977
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$30.95 -
WORKS CONNECTION Engine Plug - Red - Gas Gas/Husqvarna/KTM 24-451
WORKS CONNECTION
$30.95Stock engine plugs invite vibration, corrosion, and a cluttered engine bay. WORKS CONNECTION's precision-machined aluminum plugs deliver a clean aesthetic while protecting critical engine ports with...09500978- SKU:
- 09500978
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
$30.95 -
On Sale
WORKS CONNECTION Engine Plug - Black - Gas Gas/Husqvarna/KTM 24-452
WORKS CONNECTION
MSRP: $30.95Now: $20.00Was: $30.95Stock engine plugs are vulnerable to damage and corrosion, compromising both aesthetics and reliability on your off-road machine. These precision-machined WORKS CONNECTION plugs deliver a...09500979- SKU:
- 09500979
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
MSRP: $30.95Now: $20.00Was: $30.95 -
WORKS CONNECTION Engine Plug - Orange - Gas Gas/Husqvarna/KTM 24-453
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and can detract from your bike's appearance—especially if you've invested in premium components elsewhere. These WORKS CONNECTION plugs deliver both...09500980- SKU:
- 09500980
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
WORKS CONNECTION Engine Plug - Silver - Gas Gas/Husqvarna/KTM 24-454
WORKS CONNECTION
$29.95Stock engine plugs are prone to corrosion and can detract from an otherwise refined build. These WORKS CONNECTION plugs replace worn or damaged originals with precision-machined aluminum components...09500981- SKU:
- 09500981
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$29.95 -
WORKS CONNECTION Radiator Drain Plug - Blue - Honda/Kawasaki 24-630
WORKS CONNECTION
$22.95The stock plastic radiator drain plug is a weak point in your cooling system—repeated thermal cycles and vibration will eventually cause it to crack or strip, leaving you stranded with a catastrophic...09500982- SKU:
- 09500982
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$22.95Qty in Cart: 0Quantity:Price:$22.95Subtotal: -
WORKS CONNECTION Radiator Drain Plug - Red - Honda/Kawasaki 24-631
WORKS CONNECTION
$22.95Stock plastic radiator drain plugs fail—especially under track conditions or routine maintenance cycles. The WORKS CONNECTION Radiator Drain Plug replaces that weak point with a CNC-machined billet...09500983- SKU:
- 09500983
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$22.95Qty in Cart: 0Quantity:Price:$22.95Subtotal: -
WORKS CONNECTION Radiator Drain Plug - Silver - Honda/Kawasaki 24-634
WORKS CONNECTION
$23.95Stock plastic radiator drain plugs are prone to cracking and leaking under thermal stress—a problem that can compromise your cooling system and derail race day. The WORKS CONNECTION billet aluminum...09500986- SKU:
- 09500986
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$23.95 -
On Sale
Wossner Piston Kit 54.45mm Yamaha YZ125 1998-2001 8091D050
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00Yamaha YZ125 owners pushing their machines at high RPM need a piston engineered to handle the demands of modern 2-stroke racing. The Wossner 54.45mm kit delivers the precision fit and durability...09104816- SKU:
- 09104816
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal:
