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
-
On Sale
VERTEX Piston Ring 590397000003
VERTEX
MSRP: $80.95Now: $72.86Was: $80.95Replacement Piston Rings09120352- SKU:
- 09120352
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $80.95Now: $72.86Was: $80.95 -
JE PISTONS Piston Kit 323898
JE PISTONS
$329.99Machined from 2618-T6 high-tensile forged aluminum, Dome/dish features smooth flowing radii; requires no deburring or preparation, Specifically engineered for extreme applications including professional competition, Pro Series pistons available for...09105934- SKU:
- 09105934
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE SIZE METRIC:
- 95.00 MM
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON HEAD SHAPE:
- DOMED
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- UNITS:
- KIT
$329.99Qty in Cart: 0Quantity:Price:$329.99Subtotal: -
Wossner Piston Kit KTM 65 SX 2000-2008 8198DA
WOSSNER
$102.00Elevate your engine's performance with the WOSSNER Piston Kit 8198DA, meticulously engineered for 2-stroke applications. Crafted from premium materials, this piston kit is designed to enhance efficiency and reduce friction, ensuring a quieter operation...09105573- SKU:
- 09105573
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 44.96 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- UNITS:
- KIT
$102.00Qty in Cart: 0Quantity:Price:$102.00Subtotal: -
On Sale
VERTEX Piston Kit 24142B
VERTEX
MSRP: $303.95Now: $273.56Was: $303.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105187- SKU:
- 09105187
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON DIAMETER METRIC:
- 80.97 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- DISPLACEMENT:
- 270 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
MSRP: $303.95Now: $273.56Was: $303.95Qty in Cart: 0Quantity:Price:MSRP: $303.95Now: $273.56Was: $303.95Subtotal: -
On Sale
VERTEX Piston Kit 24267A
VERTEX
MSRP: $237.95Now: $214.16Was: $237.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105174- SKU:
- 09105174
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $237.95Now: $214.16Was: $237.95Qty in Cart: 0Quantity:Price:MSRP: $237.95Now: $214.16Was: $237.95Subtotal: -
On Sale
VERTEX Piston Kit 24244B
VERTEX
MSRP: $254.95Now: $229.46Was: $254.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105168- SKU:
- 09105168
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PISTON DIAMETER METRIC:
- 71.935 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $254.95Now: $229.46Was: $254.95 -
Wossner 75.98mm Piston Kit for 2006-2012 KTM 250 SX-F 8645DC
WOSSNER
$204.00Experience unparalleled performance with the WOSSNER Piston Kit 8645DC, designed for 2-stroke engines. Crafted from high-quality materials and engineered in Germany, this piston kit enhances engine efficiency while minimizing friction for a smoother ride...09104958- SKU:
- 09104958
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 76.02 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 75.98 MM
- PRODUCT NAME:
- PISTON KIT
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wossner Piston Kit 53.97mm for Husqvarna CR125 1998-2013 8089DC
WOSSNER
$142.00Enhance your engine's performance with the WOSSNER Piston Kit 8089DC, meticulously crafted for 2-stroke applications. This premium piston kit combines advanced engineering with high-quality materials to deliver superior durability and efficiency,...09104814- SKU:
- 09104814
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 54.02 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 53.97 MM
$142.00Qty in Cart: 0Quantity:Price:$142.00Subtotal: -
Wossner Piston Kit 66.35mm Kawasaki KX250 2002-2004 8088DB
WOSSNER
$150.96Experience unparalleled performance with the WOSSNER Piston Kit 8088DB, meticulously engineered for 2-stroke engines. Crafted from premium 4032 T6 forged aluminum alloy, this piston kit is designed to enhance power and efficiency while minimizing...09104810- SKU:
- 09104810
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- PISTON SIZE METRIC:
- 66.35 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
$150.96Qty in Cart: 0Quantity:Price:$150.96Subtotal: -
On Sale
VERTEX Piston Kit 23641B
VERTEX
MSRP: $302.95Now: $272.66Was: $302.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102568- SKU:
- 09102568
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
MSRP: $302.95Now: $272.66Was: $302.95 -
On Sale
ATHENA Piston Kit S4F102000040
ATHENA
MSRP: $284.95Now: $256.00Was: $284.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09102539- SKU:
- 09102539
- Availability:
- Ships Same Business Day
- Weight:
- 1.04 LBS
- PISTON DIAMETER METRIC:
- 101.96 MM
- COMPRESSION RATIO IMPERIAL:
- 12.2:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE SIZE METRIC:
- 101.96 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- REPLACEMENT FORGED PISTON
MSRP: $284.95Now: $256.00Was: $284.95 -
On Sale
VERTEX Piston Kit 23564B
VERTEX
MSRP: $256.95Now: $231.26Was: $256.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102085- SKU:
- 09102085
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
MSRP: $256.95Now: $231.26Was: $256.95 -
On Sale
VERTEX Piston Kit 22216A
VERTEX
MSRP: $165.95Now: $149.36Was: $165.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102077- SKU:
- 09102077
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
MSRP: $165.95Now: $149.36Was: $165.95Qty in Cart: 0Quantity:Price:MSRP: $165.95Now: $149.36Was: $165.95Subtotal: -
On Sale
VERTEX Piston Kit 23205500
VERTEX
MSRP: $165.95Now: $149.36Was: $165.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09102076- SKU:
- 09102076
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- STYLE:
- CAST BIG BORE
- UNITS:
- KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 103 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 52.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $165.95Now: $149.36Was: $165.95Qty in Cart: 0Quantity:Price:MSRP: $165.95Now: $149.36Was: $165.95Subtotal: -
On Sale
VERTEX Piston Kit 23329B
VERTEX
MSRP: $302.95Now: $272.66Was: $302.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09101007- SKU:
- 09101007
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
MSRP: $302.95Now: $272.66Was: $302.95 -
On Sale
VERTEX Piston Kit - Standard 22541B
VERTEX
MSRP: $302.95Now: $272.66Was: $302.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09101003- SKU:
- 09101003
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 77.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- DISPLACEMENT:
- 360 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
MSRP: $302.95Now: $272.66Was: $302.95Qty in Cart: 0Quantity:Price:MSRP: $302.95Now: $272.66Was: $302.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06600002C
ATHENA
MSRP: $109.95Now: $99.00Was: $109.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100452- SKU:
- 09100452
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 65.96 MM
- DISPLACEMENT:
- 198 CC
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- C
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
MSRP: $109.95Now: $99.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $99.00Was: $109.95Subtotal: -
On Sale
ATHENA Piston Kit S4C05400010A
ATHENA
MSRP: $120.95Now: $109.00Was: $120.95Includes rings, clips and pin, Easy-to-follow step-by-step installation instructions09100253- SKU:
- 09100253
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- STYLE:
- STANDARD BORE
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 14.8:1
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON
MSRP: $120.95Now: $109.00Was: $120.95 -
On Sale
ATHENA Piston Kit S4F07200001A
ATHENA
MSRP: $225.95Now: $203.00Was: $225.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100172- SKU:
- 09100172
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
- BORE SIZE METRIC:
- 71.93 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- COMPRESSION RATIO IMPERIAL:
- STOCK
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $225.95Now: $203.00Was: $225.95Qty in Cart: 0Quantity:Price:MSRP: $225.95Now: $203.00Was: $225.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06640007A
ATHENA
MSRP: $164.95Now: $148.00Was: $164.95Two-stroke pistons are made from 4032 silicium, Four-stroke pistons are made from 2618 silicium - the same material used to produce Formula 1 pistons, Both include 3% copper in materials for better heat resistance, All pistons are forged using a...09100131- SKU:
- 09100131
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- COMPRESSION RATIO IMPERIAL:
- STOCK
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.34 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
MSRP: $164.95Now: $148.00Was: $164.95Qty in Cart: 0Quantity:Price:MSRP: $164.95Now: $148.00Was: $164.95Subtotal:
