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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VERTEX Piston Kit 24275A
VERTEX
$353.95All 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...09105131- SKU:
- 09105131
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- CYLINDER DIAMETER METRIC:
- 79 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- GP RACER'S CHOICE
- PISTON DIAMETER METRIC:
- 78.96 MM
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$353.95 -
VERTEX Piston Kit 24198B
VERTEX
$341.95All 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...09105135- SKU:
- 09105135
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- DISPLACEMENT:
- 480 CC
- PISTON DIAMETER METRIC:
- 98.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 99.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED BIG BORE
$341.95Qty in Cart: 0Quantity:Price:$341.95Subtotal: -
VERTEX Piston Kit 24238A
VERTEX
$327.95All 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...09105137- SKU:
- 09105137
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- DISPLACEMENT:
- 366 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$327.95 -
VERTEX Piston Kit 24238B
VERTEX
$327.95All 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...09105138- SKU:
- 09105138
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- UNITS:
- KIT
- DISPLACEMENT:
- 366 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- CYLINDER DIAMETER METRIC:
- 90.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.97 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- STREET
- STYLE:
- FORGED BIG BORE
$327.95 -
VERTEX Piston Kit 24213A
VERTEX
$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...09105143- SKU:
- 09105143
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$302.95 -
VERTEX Piston Kit 24213B
VERTEX
$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...09105144- SKU:
- 09105144
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$302.95 -
VERTEX Piston Kit 24209A
VERTEX
$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...09105149- SKU:
- 09105149
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95 -
VERTEX Piston Kit 24209B
VERTEX
$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...09105150- SKU:
- 09105150
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95 -
VERTEX Piston Kit - High Compression 24023B
VERTEX
$331.95All 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 life09103694- SKU:
- 09103694
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 14.8:1
- UNITS:
- KIT
$331.95 -
VERTEX Piston Kit 23757B
VERTEX
$289.95All 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...09103179- SKU:
- 09103179
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
$289.95 -
VERTEX Piston Kit 23761C
VERTEX
$294.95All 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 life09103186- SKU:
- 09103186
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
$294.95 -
VERTEX Piston Kit 23249B
VERTEX
$223.95All 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 life09102553- SKU:
- 09102553
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.34 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$223.95 -
VERTEX Piston Kit 23381A
VERTEX
$315.95All 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 life09102557- SKU:
- 09102557
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
$315.95 -
VERTEX Piston Kit 23383B
VERTEX
$208.95All 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 life09102558- SKU:
- 09102558
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.96 MM
- STYLE:
- CAST REPLICA
$208.95 -
VERTEX Piston Kit 23375A
VERTEX
$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...09102421- SKU:
- 09102421
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 300 CC
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 72 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$254.95 -
VERTEX Piston Kit 23375C
VERTEX
$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...09102422- SKU:
- 09102422
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.96 MM
- CYLINDER DIAMETER METRIC:
- 72 MM
$254.95 -
VERTEX Piston Kit 22995B
VERTEX
$158.95All 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...09102034- SKU:
- 09102034
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.93 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$158.95Qty in Cart: 0Quantity:Price:$158.95Subtotal: -
Wiseco Wrist Pin 16mm x 46.99mm for Polaris Indy Touring 340 1999-2003 S270
WISECO
$22.99Discover the unparalleled innovation behind Wiseco's S270 product, engineered for enthusiasts who seek peak performance and reliability. This high-tech solution combines advanced materials with precision engineering, ensuring your engine operates at its...S270- SKU:
- S270
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH:
- 50,6 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 16.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- LENGTH METRIC:
- 50.6 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- OUTSIDE DIAMETER:
- 16,00 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
$22.99 -
Wiseco Wrist Pin for Yamaha YZ490 1982-1990 S277
WISECO
$22.99Unlock the potential of your engine with the Wiseco S277 Performance Piston, expertly engineered for high-performance applications. This piston combines advanced technology with precision craftsmanship to deliver unmatched strength and reliability,...S277- SKU:
- S277
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
- LENGTH:
- 72 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 18,00 MM
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- LENGTH METRIC:
- 72 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$22.99 -
Wiseco Wrist Pin 18mm x 62.81mm for Polaris 400L 2x4 1994-1995 S278
WISECO
$22.99Experience unparalleled durability and precision with Wiseco's advanced piston technology. Engineered for superior strength and minimal thermal expansion, these pistons are designed to withstand extreme conditions while maximizing engine performance. ...S278- SKU:
- S278
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 62.8 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 18,00 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- WRIST PIN
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
- UNITS:
- EACH
- LENGTH:
- 62,8 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ATV
$22.99Qty in Cart: 0Quantity:Price:$22.99Subtotal:
