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 47mm Piston Kit for KTM 65 SX 1999-2008 PK1515
WISECO
$189.95When your KTM 65 SX's top end is worn, you're losing compression, power, and reliability. The Wiseco PK1515 restores—and exceeds—OEM performance with aerospace-grade materials engineered for 2-stroke...09030702- SKU:
- 09030702
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 63.58 CC
- PISTON DIAMETER METRIC:
- 46.95 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 47.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +2,00 MM
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
Wiseco Suzuki RM80 1991-2001 49.5mm Piston Kit with Gaskets PK1528
WISECO
$189.95If you're running a 1991-2001 Suzuki RM80 and want to restore lost compression or upgrade to fresh top-end internals, the Wiseco PK1528 is the standard choice for serious riders. This complete piston...09030710- SKU:
- 09030710
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 46.80 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 49.50 MM
- DISPLACEMENT:
- 82 CC
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 49.45 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
Wiseco Piston Kit Suzuki RM250 2003-2008 823M06750
WISECO
$118.95A worn or damaged piston directly limits your RM250's power output and throttle response. Wiseco's 823M06750 kit restores—or exceeds—OEM performance with precision-engineered internals and a complete...09101251- SKU:
- 09101251
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +1.10 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.50 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
$118.95Qty in Cart: 0Quantity:Price:$118.95Subtotal: -
Wiseco Piston Kit 45.00mm 2.00mm Oversize Kawasaki KX60 1983-2003 648M04500
WISECO
$134.95When your KX60's stock piston reaches its limit, a quality replacement isn't optional—it's essential for maintaining compression, ring seal, and reliability through the heat cycles of aggressive...09100344- SKU:
- 09100344
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 60 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 41.60 MM
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 54mm for Suzuki RM125 2004-2007 835M05400
WISECO
$144.95If you're running a 2004-2007 Suzuki RM125 and want to reclaim lost compression, boost throttle response, and extend engine life, a quality piston kit is non-negotiable. The Wiseco 835M05400 Pro-Lite...09100357- SKU:
- 09100357
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco KX250 1993-2001 Piston Kit 68.50mm PK1291
WISECO
$294.95If you're running a vintage KX250 and want measurable gains in top-end power and engine reliability, a quality piston kit is non-negotiable. The Wiseco PK1291 delivers precision-forged internals that...09030547- SKU:
- 09030547
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE:
- +2,10 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON DIAMETER METRIC:
- 68.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 68.50 MM
- PRODUCT NAME:
- REBUILD KIT
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
Wiseco Yamaha YZ250F 2001-2004 Piston Kit with Gaskets PK1241
WISECO
$294.95When your YZ250F's top end starts showing wear, a complete piston and gasket kit is the most reliable path to restoring full compression and power delivery. Wiseco's PK1241 gives you OEM-spec...09030554- SKU:
- 09030554
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.7:1
- DISPLACEMENT:
- 249 CC
- PISTON DIAMETER METRIC:
- 76.95 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- TOP END
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
Wiseco Piston Kit 77mm 14.1:1 for 2004-2005 Kawasaki KX250F PK1239
WISECO
$339.95If you're rebuilding your 2004–2005 KX250F or pushing it to its limits in competition, piston wear or damage will kill your power delivery and throttle response. The Wiseco PK1239 restores full...09030556- SKU:
- 09030556
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.1:1
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 53.60 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 76.96 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$339.95Qty in Cart: 0Quantity:Price:$339.95Subtotal: -
Wiseco Piston Kit Kawasaki GPz1100 1981-1985 1.089L 0.050 WK1247
WISECO
$574.95Stock pistons wear quickly under sustained high RPM, losing compression and power output. The Wiseco WK1247 restores—and exceeds—factory performance with forged aluminum construction and precision...WK1247- SKU:
- WK1247
- Availability:
- Ships Same Business Day
- Weight:
- 3.81 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- +0,50 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 80.50 MM
- PISTON DIAMETER METRIC:
- 80.39 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 1083 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$574.95Qty in Cart: 0Quantity:Price:$574.95Subtotal: -
WORKS CONNECTION Engine Timing Plug - Blue - Yamaha 24-550
WORKS CONNECTION
$32.95Engine timing plugs are a critical detail that separates a dialed-in bike from one that looks half-finished. These WORKS CONNECTION plugs replace your stock covers with precision-machined aluminum...09500102- SKU:
- 09500102
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLUE
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- ENGINE
- UNITS:
- SET
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
WORKS CONNECTION Engine Timing Plug - Red 24-575
WORKS CONNECTION
$49.95Engine timing plugs might seem like a small detail, but they're one of the first things experienced builders and tuners upgrade. Stock plugs are often cheap plastic or low-grade castings that look...09500111- SKU:
- 09500111
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- UNITS:
- SET
- MATERIAL:
- 6061 T-6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
On Sale
Wossner Connecting Rod KTM 250 EXC 2000-2005 P2023
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00If you're rebuilding a KTM 250 EXC engine, the connecting rod is critical—it's the link between your piston and crankshaft that handles enormous stress with every combustion cycle. The Wössner P2023...09230410- SKU:
- 09230410
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Connecting Rod Suzuki RM250 2003-2010 P2025
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00A connecting rod is the critical link between your piston and crankshaft—and a weak one can cost you horsepower, reliability, and your entire rebuild investment. The Wössner P2025 for Suzuki RM250...09230411- SKU:
- 09230411
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Connecting Rod for Honda CRF450R 2002-2008 P4026
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00If you're rebuilding a CRF450R engine, the connecting rod is your foundation for reliable power delivery and longevity. Wössner's 8620 forged construction and shot-peening process deliver the fatigue...09230441- SKU:
- 09230441
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Connecting Rod Honda CRF450R 2009-2016 P4027
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00A connecting rod is the critical link between your piston and crankshaft—when it fails, your engine fails. The Wössner P4027 is engineered from 8620 forged alloy with shot peening and FEA...09230442- SKU:
- 09230442
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Connecting Rod for KTM 250 EXC 2001-2006 P4048
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00If you're rebuilding the top end of your KTM 250 EXC, the connecting rod is the critical link between piston and crankshaft—a weak point here will compromise both reliability and power delivery. The...09230450- SKU:
- 09230450
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- STANDARD
- UNITS:
- KIT
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Piston Kit KTM 250 SX-F 2016-2022 8923DB
WOSSNER
MSRP: $224.00Now: $212.80Was: $224.00Whether you're prepping for race season or rebuilding after a hard season of riding, a quality piston kit is non-negotiable for 2-stroke performance. The Wössner 8923DB delivers the durability and...09106135- SKU:
- 09106135
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 78.01 MM
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 77.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $224.00Now: $212.80Was: $224.00 -
On Sale
Wossner Piston Kit Yamaha YZ450F 2018-2019 12.9:1 8949DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00The stock piston in your YZ450F will eventually wear, lose compression, and cost you power when it matters most. Wossner's 12.9:1 piston kit restores—and exceeds—factory performance with German...09106137- SKU:
- 09106137
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON SIZE METRIC:
- 96.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $204.00Now: $193.80Was: $204.00Qty in Cart: 0Quantity:Price:MSRP: $204.00Now: $193.80Was: $204.00Subtotal: -
On Sale
Wossner Piston Ring Set KTM 250 SX-F 2006-2012 TPR76.00
WOSSNER
MSRP: $38.50Now: $36.58Was: $38.50Worn piston rings bleed compression, sap horsepower, and accelerate engine wear—especially critical in high-revving 2-strokes where sealing integrity directly impacts performance. The Wossner Piston...09120863- SKU:
- 09120863
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING SET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 76.00 MM
MSRP: $38.50Now: $36.58Was: $38.50Qty in Cart: 0Quantity:Price:MSRP: $38.50Now: $36.58Was: $38.50Subtotal: -
MOOSE RACING Crank Bearing - KDX/JR50 24-1067
MOOSE RACING
$43.95A worn or failing crankshaft bearing is the fastest way to turn a running 2-stroke into a seized engine. This MOOSE RACING precision bearing kit restores proper crankshaft support and sealing,...09240102- SKU:
- 09240102
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- BALL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- STREET
$43.95
