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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JE PISTONS Piston Kit 284667
JE PISTONS
$329.99When you're pushing your engine to the limit in professional competition, your pistons need to survive extreme pressures and temperatures without compromise. JE Pistons' 284667 Kit delivers the precision engineering and materials science required for...09105890- SKU:
- 09105890
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- PRO SERIES
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$329.99 -
JE PISTONS Piston Kit 247940
JE PISTONS
$299.99When you're pushing an engine to its absolute limits in competition, your pistons need to survive extreme pressure, heat, and RPM without compromise. JE PISTONS' Pro Series 247940 kit delivers the precision engineering and material science required for...09105858- SKU:
- 09105858
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- DISPLACEMENT:
- 270 CC
- PISTON HEAD SHAPE:
- DISHED
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 80.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- +3,00 MM
- RIDING STYLE:
- OFF-ROAD
$299.99 -
Wossner Piston Kit 46.95mm Honda CR80R 1992-2002 8237DA
WOSSNER
$112.00When you're pushing a CR80R to its limits, stock pistons become the weak link. The Wossner 8237DA replaces worn or damaged pistons with a precision-engineered component that delivers measurable gains in reliability and throttle response. Built with...09105581- SKU:
- 09105581
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- DISPLACEMENT:
- 80 CC
- PISTON SIZE METRIC:
- 46.95 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
$112.00 -
VERTEX Piston Kit 24220A
VERTEX
$269.95The VERTEX Piston Kit 24220A delivers the reliability and performance characteristics your engine demands, whether you're running a high-revving two-stroke or a demanding four-stroke application. VERTEX's engineering approach—combining precision heat...09105189- SKU:
- 09105189
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- DISPLACEMENT:
- 250 CC
$269.95 -
VERTEX Piston Kit 24244C
VERTEX
$251.95Whether you're rebuilding a two-stroke or four-stroke engine, the VERTEX Piston Kit 24244C delivers the precision and durability required for consistent performance across the entire RPM range. VERTEX's advanced metallurgy and manufacturing...09105169- SKU:
- 09105169
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.945 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$251.95 -
VERTEX Piston Kit 24244A
VERTEX
$254.95The VERTEX Piston Kit 24244A delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding a tired top end. Built with forged 2618 aluminum and engineered for strength across the RPM range, this kit ensures...09105167- SKU:
- 09105167
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.925 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$254.95 -
VERTEX Piston Kit 24212B
VERTEX
$136.95A quality piston kit is the foundation of reliable top-end performance—whether you're rebuilding after wear or upgrading for increased displacement and power. The VERTEX Piston Kit 24212B delivers precision-engineered components with forged 2618 aluminum...09105164- SKU:
- 09105164
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- PISTON DIAMETER METRIC:
- 46.95 MM
- PISTON MATERIAL:
- CAST
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$136.95 -
VERTEX Piston Kit 24212A
VERTEX
$137.95Whether you're rebuilding a two-stroke or four-stroke engine, piston quality directly impacts reliability, power delivery, and longevity under load. The VERTEX Piston Kit 24212A delivers OEM-grade performance with forged and cast options engineered for...09105163- SKU:
- 09105163
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 46.94 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PRODUCT NAME:
- PISTON KIT
$137.95 -
VERTEX Piston Kit 24243C
VERTEX
$164.95The VERTEX Piston Kit 24243C delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding a worn top end. Built with forged or cast options and finished with molybdenum disulfide coating, these pistons...09105161- SKU:
- 09105161
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.96 MM
- STYLE:
- CAST RACE
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$164.95 -
VERTEX Piston Kit 24243B
VERTEX
$164.95The VERTEX Piston Kit 24243B delivers the reliability and precision your engine demands, whether you're pushing peak RPMs on the track or fine-tuning your build in the garage. Engineered with advanced metallurgy and surface treatments, these pistons are...09105160- SKU:
- 09105160
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- STREET
- STYLE:
- CAST RACE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
$164.95 -
Wossner Piston Kit 8656DA for Honda CRF250R 2006-2009
WOSSNER
$184.00Stock pistons can't handle the sustained heat and load demands of racing or high-performance riding. The Wossner 8656DA delivers the durability and precision you need to push your CRF250R to its limits without sacrificing reliability. Whether you're...09104960- SKU:
- 09104960
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 77.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED
$184.00 -
Wossner Dual Ring Piston Kit KTM 250 2005-2025 8169DB
WOSSNER
$152.00The Wossner 8169DB piston kit delivers the reliability and precision required for sustained high-rpm performance in your KTM 250 2-stroke. Factory-engineered with 4032 T6 forged aluminum and a permanent friction-reducing skirt coating, this kit minimizes...09104862- SKU:
- 09104862
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$152.00 -
Wossner Piston Kit KTM 250 SX 2005-2020 8169DA
WOSSNER
$152.00The KTM 250 SX demands a piston that can withstand extreme combustion pressures and sustained high RPMs without compromising reliability. Wossner's 8169DA kit delivers exactly that—a German-engineered piston assembly built from 4032 T6 forged aluminum...09104861- SKU:
- 09104861
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.34 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- TYPE:
- DUAL RING
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$152.00 -
Wossner Piston Kit Kawasaki KX250 2002-2004 66.34mm 8088DA
WOSSNER
$152.00The Wossner 8088DA piston kit is engineered for KX250 riders who demand reliable power delivery and engine longevity. A complete OEM-quality replacement, this kit eliminates guesswork with matched components designed to work together seamlessly. If...09104809- SKU:
- 09104809
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 66.40 MM
- PISTON SIZE METRIC:
- 66.34 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
$152.00 -
On Sale
ATHENA Piston Kit S4F08100005B
ATHENA
MSRP: $293.95Now: $265.00Was: $293.95A high-quality piston kit is essential for maintaining engine performance and reliability, whether you're rebuilding after wear or upgrading for increased displacement. The ATHENA Piston Kit S4F08100005B delivers OEM-equivalent precision with all...09104194- SKU:
- 09104194
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON DIAMETER METRIC:
- 80.96 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
MSRP: $293.95Now: $265.00Was: $293.95 -
On Sale
ATHENA Piston Kit S4F08100005A
ATHENA
MSRP: $293.95Now: $265.00Was: $293.95A quality piston kit is the foundation of reliable engine performance, directly affecting compression ratio, combustion efficiency, and overall durability under load. The ATHENA Piston Kit S4F08100005A delivers OEM-specification engineering with...09104193- SKU:
- 09104193
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PISTON DIAMETER METRIC:
- 80.95 MM
- PRODUCT NAME:
- PISTON
- STYLE:
- BIG BORE
- PISTON SIZE METRIC:
- STANDARD SIZE A
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $293.95Now: $265.00Was: $293.95 -
VERTEX Piston Kit 23647A
VERTEX
$289.95A high-performance piston kit demands precision engineering and durability that goes beyond standard OEM specs. The VERTEX Piston Kit 23647A delivers the thermal stability and low-friction characteristics needed for sustained high-RPM operation and...09102572- SKU:
- 09102572
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
$289.95 -
VERTEX Piston Kit 23599B
VERTEX
$271.95Whether you're rebuilding a tired engine or upgrading to high-compression performance, the VERTEX Piston Kit 23599B delivers the durability and precision required for sustained high-RPM operation. These forged pistons withstand extreme combustion...09102566- SKU:
- 09102566
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED REPLICA
- CYLINDER DIAMETER METRIC:
- 79.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 78.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$271.95 -
On Sale
ATHENA Piston Kit S4F100000190
ATHENA
MSRP: $257.95Now: $232.00Was: $257.95Engine reliability depends on quality internal components, and pistons are the foundation of any high-performance rebuild or refresh. The ATHENA Piston Kit S4F100000190 delivers precision-engineered pistons with matching rings and clips to restore or...09102535- SKU:
- 09102535
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 100.00 MM
- UNITS:
- EACH
MSRP: $257.95Now: $232.00Was: $257.95 -
On Sale
ATHENA Piston Kit S4F04500001A
ATHENA
MSRP: $142.95Now: $129.00Was: $142.95Maximum piston longevity and reliability demand materials engineered for extreme thermal stress—and the ATHENA S4F04500001A delivers exactly that. Whether you're running a two-stroke or four-stroke, this kit uses the same aerospace-grade aluminum alloys...09102531- SKU:
- 09102531
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 44.96 MM
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- TYPE:
- A
MSRP: $142.95Now: $129.00Was: $142.95
