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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On Sale
Wiseco Piston Kit 49mm Honda CRF80F 2004-2013 PK1227
WISECO
MSRP: $187.95Now: $153.00Was: $187.95If you're running a CRF80F and want to unlock real performance gains, you need a piston kit engineered for the demands of high-RPM riding and racing. Wiseco's forged aluminum construction delivers...09030232- SKU:
- 09030232
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +1,50 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.00 MM
- PISTON DIAMETER METRIC:
- 48.97 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
MSRP: $187.95Now: $153.00Was: $187.95 -
On Sale
Wiseco Honda XR200 1980-1983 Piston Kit with Gaskets 66.50mm PK1118
WISECO
MSRP: $204.95Now: $174.00Was: $204.95A quality top-end rebuild is critical for maintaining the power and reliability of your XR200, and the Wiseco PK1118 kit gives you everything needed in one package. High-silicone forged construction...09030235- SKU:
- 09030235
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE SIZE METRIC:
- 66.50 MM
- PISTON DIAMETER METRIC:
- 66.45 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 192 CC
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
MSRP: $204.95Now: $174.00Was: $204.95Qty in Cart: 0Quantity:Price:MSRP: $204.95Now: $174.00Was: $204.95Subtotal: -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX65 2000-2020 PK1177
WISECO
MSRP: $172.95Now: $140.00Was: $172.95The Wiseco Piston Kit PK1177 is engineered for serious KX65 performance. If you're rebuilding a worn top-end or chasing reliability in competitive riding, this forged piston assembly delivers the...09030304- SKU:
- 09030304
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 44.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- DISPLACEMENT:
- 64 CC
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
MSRP: $172.95Now: $140.00Was: $172.95 -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX85 2001-2013 PK1187
WISECO
MSRP: $181.95Now: $140.00Was: $181.95When you're rebuilding a 2-stroke top-end, every component matters—and Wiseco's engineered tolerances are designed to keep your KX85 running at peak power without premature wear or ring flutter. This...09030306- SKU:
- 09030306
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.50 MM
- DISPLACEMENT:
- 84.9 CC
- PISTON DIAMETER METRIC:
- 48.45 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
MSRP: $181.95Now: $140.00Was: $181.95Qty in Cart: 0Quantity:Price:MSRP: $181.95Now: $140.00Was: $181.95Subtotal: -
On Sale
Wiseco 66.40mm Top End Kit for 2002-2004 Honda CR250R PK1195
WISECO
MSRP: $263.95Now: $217.00Was: $263.95If you're running a 2002-2004 Honda CR250R at the track or on the trail, a worn top end kills power and reliability. The Wiseco 66.40mm Top End Kit restores lost compression and delivers the...09030307- SKU:
- 09030307
- Availability:
- Ships Same Business Day
- Weight:
- 1.39 LBS
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 66.36 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $263.95Now: $217.00Was: $263.95 -
On Sale
Wiseco YZ250 2002-2025 Piston Kit with Gaskets PK1198
WISECO
MSRP: $272.95Now: $208.00Was: $272.95A worn or damaged piston directly compromises your YZ250's power delivery and engine reliability. This Wiseco kit gives you everything needed for a complete top-end rebuild without sourcing...09030308- SKU:
- 09030308
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $272.95Now: $208.00Was: $272.95 -
On Sale
Wiseco Yamaha YZ125 1998-2000 Piston Kit with Gaskets PK1173
WISECO
MSRP: $225.95Now: $178.00Was: $225.95A top-end rebuild is non-negotiable if you're serious about YZ125 performance and longevity. Wiseco's forged piston kit delivers the precision fit and thermal stability your 2-stroke demands under...09030309- SKU:
- 09030309
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $225.95Now: $178.00Was: $225.95Qty in Cart: 0Quantity:Price:MSRP: $225.95Now: $178.00Was: $225.95Subtotal: -
On Sale
Wiseco Piston Kit with Gaskets for 1997-2001 Honda CR250R PK1168
WISECO
MSRP: $281.95Now: $217.00Was: $281.95A worn or damaged piston compromises combustion efficiency, throttle response, and engine reliability—especially critical in a 2-stroke where every component works at the edge of its limits. The...09030311- SKU:
- 09030311
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $281.95Now: $217.00Was: $281.95 -
On Sale
Wiseco YZ250 2002-2022 Piston Kit with Gaskets PK1704
WISECO
MSRP: $291.95Now: $234.00Was: $291.95When you're rebuilding a YZ250 top end, you need a piston kit that delivers consistent performance lap after lap without compromise. The Wiseco PK1704 is engineered specifically for the 2002-2022...09030929- SKU:
- 09030929
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- COOLING SYSTEM:
- LIQUID COOLED
- DISPLACEMENT:
- 249,3 CC
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
MSRP: $291.95Now: $234.00Was: $291.95 -
On Sale
Wiseco KX85 2001-2013 Piston Kit with Gaskets PK1762
WISECO
MSRP: $192.95Now: $153.00Was: $192.95Two-stroke engines demand precision components that can handle extreme combustion pressures and temperatures without sacrifice. The Wiseco KX85 Piston Kit delivers the durability and reliability you...09030930- SKU:
- 09030930
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 84.9 CC
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- GP SERIES
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 48.50 MM
- PISTON DIAMETER METRIC:
- 48.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
MSRP: $192.95Now: $153.00Was: $192.95 -
Wiseco Piston Kit Standard 54mm Honda CR125R 1992-2003 676M05400
WISECO
$143.95The Wiseco Piston Kit delivers the durability and power output your Honda CR125R demands, whether you're pushing hard on the track or logging miles on the trail. Precision-forged from high-silicon...676M05400- SKU:
- 676M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
$143.95 -
Wiseco Piston Kit 54.50 mm Honda CR125R 1992-2003 676M05450
WISECO
$154.95The Wiseco Piston Kit 54.50 mm is engineered for Honda CR125R riders who demand reliability under extreme conditions. Whether you're pushing lap times on the track or navigating technical terrain,...676M05450- SKU:
- 676M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 52.00 mm Oversize Suzuki RM 85 2002-2022 806M05200
WISECO
$169.95When you're rebuilding a Suzuki RM 85 or pushing it to its limits on the track, a quality piston kit isn't optional—it's foundational. The Wiseco +5.00 mm piston delivers the strength and precision...806M05200- SKU:
- 806M05200
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 99.4 CC
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 46,80 MM
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal: -
Wiseco Piston Kit 56.00mm 2.00mm Oversize for KTM 125 SX 2001-2021 786M05600
WISECO
$174.95If you're running a KTM 125 SX at the edge of performance, a worn or damaged piston directly throttles your power output and reliability. This Wiseco piston kit delivers the compression ratio...786M05600- SKU:
- 786M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- STROKE LENGTH:
- 54,50 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 54mm Bore Kawasaki KX125 2001-2008 788M05400
WISECO
$184.95If you're running a KX125 at the edge of the powerband, factory pistons won't cut it—Wiseco's forged design delivers the strength and compression stability needed for consistent performance across...788M05400- SKU:
- 788M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Kit 81mm Yamaha WaveRunner 1994-1997 790M08100
WISECO
$154.23If you're running a 2-cycle engine in your WaveRunner and pushing performance limits, you need a piston that can handle sustained heat and detonation without failure. The Wiseco 790M08100 delivers...790M08100- SKU:
- 790M08100
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 81.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 701 CC
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$154.23Qty in Cart: 0Quantity:Price:$154.23Subtotal: -
Wiseco 80.50mm Piston Kit for Kawasaki 1100 ZXi 1996-2003 809M08050
WISECO
$149.95If you're running a Kawasaki 1100 ZXi and pushing hard on the track, your factory piston won't cut it. The Wiseco 809M08050 is engineered from high-silicone forged stock to deliver the strength,...809M08050- SKU:
- 809M08050
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 1083 CC
- DISPLACEMENT:
- 752 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 80.50 MM
- UNITS:
- EACH
$149.95 -
Wiseco Piston Kit 95mm 11.8:1 Compression KTM 450 XC-F 2012-2016 PK1901
WISECO
$369.95When your KTM 450 XC-F demands a complete top-end rebuild, the Wiseco Piston Kit PK1901 delivers the precision engineering and durability required for consistent high-RPM performance. High-silicone...09031145- SKU:
- 09031145
- Availability:
- Ships Same Business Day
- Weight:
- 1.76 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 63.40 MM
- TYPE:
- TOP END
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 94.95 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$369.95 -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2023 PK1904
WISECO
$186.95A quality piston kit is the foundation of any reliable 2-cycle build—it directly impacts combustion efficiency, engine longevity, and overall performance. The Wiseco PK1904 delivers OEM-grade...09031148- SKU:
- 09031148
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 84.9 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 48.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.50 MM
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$186.95 -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1905
WISECO
$186.95A top-end rebuild demands precision components that won't fail under sustained high RPM and heat stress. The Wiseco Piston Kit delivers the durability and thermal stability your KX85 needs to...09031149- SKU:
- 09031149
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 48.95 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 84.9 CC
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$186.95Qty in Cart: 0Quantity:Price:$186.95Subtotal:
