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 Engine Rebuild Kit for Kawasaki KX85 2006-2013 PWR164-101
WISECO
$499.95When your KX85's engine is showing signs of wear—whether from competitive racing, hard trail riding, or simply accumulated hours—a full rebuild becomes essential to restore performance and...09031543- SKU:
- 09031543
- Availability:
- Ships Same Business Day
- Weight:
- 7.65 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 85 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
- OVERBORE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
$499.95Qty in Cart: 0Quantity:Price:$499.95Subtotal: -
Wiseco Engine Rebuild Kit Honda CRF250R 2014-2015 PWR168-101
WISECO
$864.95When your CRF250R's engine reaches the end of its service life, a complete rebuild is the most cost-effective path to restoring full performance and reliability. The Wiseco Engine Rebuild Kit...09031547- SKU:
- 09031547
- Availability:
- Ships Same Business Day
- Weight:
- 11.75 LBS
$864.95Qty in Cart: 0Quantity:Price:$864.95Subtotal: -
Wiseco Engine Rebuild Kit Kawasaki KX85 2014-2020 48.5mm PWR173-101
WISECO
$588.95When your KX85 engine reaches the end of its service life, a quality rebuild kit is your path back to reliable performance on the track or trail. The Wiseco PWR173-101 delivers a complete...09031682- SKU:
- 09031682
- Availability:
- Ships Same Business Day
- Weight:
- 3.52 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
$588.95Qty in Cart: 0Quantity:Price:$588.95Subtotal: -
Wiseco Ring Set 49.50mm Yamaha YZ80 1976-1980 1949CD
WISECO
$49.95Piston ring sets are critical to engine durability—they seal combustion pressure, control oil consumption, and directly impact horsepower delivery. The Wiseco Ring Set 1949CD is engineered to restore...1949CD- SKU:
- 1949CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- DISPLACEMENT:
- 79,7 CC
- BORE SIZE METRIC:
- 49.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wiseco Piston Kit Standard Yamaha YZ250 1992-1998 736M06800
WISECO
$199.95The YZ250's two-stroke engine demands a piston that can handle extreme combustion pressures and rapid cycling without sacrificing responsiveness. Wiseco's precision-engineered piston kit restores—or...09101233- SKU:
- 09101233
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246,8 CC
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 68.00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.00 MM
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit 45mm Oversize for Kawasaki KX65 2000-2021 752M04500
WISECO
$119.95When you're running a KX65 at the edge of performance, stock pistons become your limiting factor. The Wiseco 752M04500 delivers the oversize displacement and reliability you need to unlock serious...09101235- SKU:
- 09101235
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 41.60 MM
- DISPLACEMENT:
- 64 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco Piston Kit with Gaskets for Yamaha YZ250 1995-1998 PK1567
WISECO
$280.95If you're running a YZ250 at the limit, a worn top-end will cost you power, reliability, and race results. The Wiseco Piston Kit PK1567 delivers a complete engine refresh with forged-aluminum...09030720- SKU:
- 09030720
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- STROKE LENGTH METRIC:
- 68.00 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 68.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 67.96 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246.8 CC
- PRODUCT NAME:
- REBUILD KIT
$280.95 -
Wiseco Piston Kit Standard Bore 96mm 12:1 Compression Honda CRF450R 2002-2008 4820M09600
WISECO
$232.95Factory pistons wear down, and a degraded top-end robs your CRF450R of responsiveness and reliability. The Wiseco Piston Kit restores lost compression and throttle response while delivering the...09100334- SKU:
- 09100334
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- STROKE LENGTH METRIC:
- 62.10 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
$232.95 -
Wiseco Piston Kit 102.40mm 9:1 Compression Honda XR650L 1993-2020 4562M10241
WISECO
$296.95If you're running an XR650L and want measurable gains in displacement and compression efficiency, a properly sized piston kit is fundamental to that upgrade. The Wiseco 102.40mm piston gives you a +2...09100338- SKU:
- 09100338
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- DISPLACEMENT:
- 675 CC
- PISTON MATERIAL:
- FORGED
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +2.40 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE - OVERSIZE:
- +2,40 MM
- BORE SIZE METRIC:
- 102.40 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$296.95Qty in Cart: 0Quantity:Price:$296.95Subtotal: -
Wiseco 66mm 11.7:1 Piston Kit for 2007-2009 Honda CRF150R PK1427
WISECO
$306.95If you're pushing your CRF150R to its limits on the track, you need a piston kit engineered to handle the stress of high-RPM racing. Wiseco's forged construction and 11.7:1 compression ratio deliver...09030688- SKU:
- 09030688
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 43.70 MM
- PISTON DIAMETER METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
$306.95 -
Wiseco Piston Kit with Gaskets for 2005-2007 Honda CR125R PK1393
WISECO
$246.95Top-end wear is the silent killer of 2-stroke performance. The Wiseco PK1393 piston kit replaces worn cylinders and pistons with precision-forged components engineered to handle sustained high RPM...09030520- SKU:
- 09030520
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 53.94 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$246.95Qty in Cart: 0Quantity:Price:$246.95Subtotal: -
Wiseco Piston Kit with Gaskets for KTM 200 EXC 2003-2016 PK1373
WISECO
$269.95When you're pushing a 2-stroke engine to its limits, factory pistons won't cut it. The Wiseco Piston Kit for your KTM 200 EXC delivers the strength and thermal stability needed to handle sustained...09030530- SKU:
- 09030530
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- MODEL:
- PRO-LITE
- UNITS:
- KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.00 MM
- BORE SIZE METRIC:
- 64.00 MM
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 63.95 MM
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Yamaha RT180 1990-1998 65.00mm Piston Kit 772M06500
WISECO
$154.95If you're rebuilding or refreshing your Yamaha RT180's engine, a quality piston kit is non-negotiable—it's the heart of combustion efficiency and power delivery. The Wiseco 65.00mm piston kit...09102876- SKU:
- 09102876
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 65.00 MM
- DISPLACEMENT:
- 179 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit Standard Bore 62.5mm 1999-2009 Gas Gas EC 200 848M06250
WISECO
$174.95When your EC 200's piston shows signs of wear, you need a direct replacement that restores compression and power without guesswork. The Wiseco Piston Kit delivers precision-engineered construction in...09102879- SKU:
- 09102879
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- STROKE LENGTH METRIC:
- 65.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 62.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 199 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 2004-2006 Yamaha YFZ450 864M04500
WISECO
$119.95When you're pushing your YFZ450 to its limits, factory pistons become the weak link. The Wiseco 864M04500 piston kit delivers the precision engineering and durability you need to run higher boost...09102880- SKU:
- 09102880
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 40.80 MM
- BORE SIZE METRIC:
- 45.00 MM
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Wiseco YZ490 1982-1983 IT490 1983-1984 Piston Kit 478M08750
WISECO
$234.95The Wiseco 478M08750 piston kit delivers the precision engineering and durability your YZ490 or IT490 demands, whether you're pushing hard on the track or tackling demanding trail conditions. Built...478M08750- SKU:
- 478M08750
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 87.50 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 487 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 87.42 MM
- SKIRT COATING:
- NON-COATED
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
On Sale
Wossner Connecting Rod Yamaha YZ250F 2014-2025 P4072
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00When you're rebuilding your YZ250F's crankshaft, a quality connecting rod is non-negotiable—it's the critical link translating combustion force into reliable power delivery. Wössner's 8620 forged...09230562- SKU:
- 09230562
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- STYLE:
- STANDARD
- UNITS:
- KIT
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Connecting Rod KTM 85SX 2003-2012 P2006
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The stock connecting rod in your KTM 85SX is a wear item that impacts both power delivery and engine longevity. A quality forged replacement like the Wössner rod restores original performance...09230570- SKU:
- 09230570
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- STANDARD
MSRP: $112.00Now: $106.40Was: $112.00Qty in Cart: 0Quantity:Price:MSRP: $112.00Now: $106.40Was: $112.00Subtotal: -
On Sale
Wossner Connecting Rod Yamaha YZ125 1986-1996 P2047
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00The stock connecting rod in your YZ125 is a common failure point during aggressive riding or engine rebuilds. Wossner's forged 8620 alloy rod delivers the strength and reliability needed to handle...09230573- SKU:
- 09230573
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- ENGINE TYPE:
- 2-STROKE
- 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 Kit for Honda CR250R 1978-2001 P2021
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00A connecting rod failure mid-race or mid-ride isn't just costly—it's catastrophic. The Wossner P2021 kit delivers the strength and reliability your Honda CR250R demands, whether you're rebuilding a...09230389- SKU:
- 09230389
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $122.00Now: $115.90Was: $122.00
