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!
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VERTEX Piston Kit 23666B
VERTEX
$123.95Whether you're rebuilding a two-stroke or refreshing a four-stroke engine, the VERTEX Piston Kit 23666B delivers the strength and precision required for reliable performance across demanding riding conditions. The combination of advanced material science...09105950- SKU:
- 09105950
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON DIAMETER METRIC:
- 47.88 MM
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 48 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
$123.95 -
VERTEX Piston Kit 23654B
VERTEX
$289.95Whether you're rebuilding a tired engine or pursuing peak performance, the VERTEX Piston Kit 23654B delivers the durability and precision required for demanding applications. These pistons combine advanced metallurgy with proven manufacturing techniques...09102060- SKU:
- 09102060
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 270 CC
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE METRIC:
- +3.00 MM
- PISTON DIAMETER METRIC:
- 79.96 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit - Standard 22652B
VERTEX
$184.95Maximum power output demands pistons engineered for extreme conditions—the VERTEX Standard 22652B delivers the durability and precision required for serious racing and high-performance builds. Built with advanced heat treatment and specialized coatings,...09100945- SKU:
- 09100945
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.96 MM
$184.95 -
VERTEX Piston Kit - Standard 22386B
VERTEX
$230.95Precision-engineered pistons are the foundation of reliable, high-output engine performance—and the VERTEX Piston Kit 22386B delivers the durability and consistency your build demands. Built with industry-leading heat treatment and a specialized skirt...09100948- SKU:
- 09100948
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- PISTON DIAMETER METRIC:
- 66.35 MM
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$230.95 -
VERTEX Piston Kit 22982B
VERTEX
$256.95The VERTEX Piston Kit 22982B delivers the durability and precision your engine demands, whether you're pushing peak horsepower on the track or rebuilding after serious wear. Engineered with T-5 heat-treated aluminum and a molybdenum disulfide skirt...09100953- SKU:
- 09100953
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
$256.95 -
VERTEX Piston Kit - Standard 22441B
VERTEX
$148.95Building a high-revving engine demands pistons engineered for reliability under extreme conditions. The VERTEX Piston Kit 22441B delivers the durability and precision you need to maximize power output while maintaining structural integrity through...09100963- SKU:
- 09100963
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 125 CC
$148.95 -
VERTEX Piston Kit - Standard 23119B
VERTEX
$156.95Precision-engineered pistons are the foundation of reliable engine performance, especially under sustained high RPM and boost conditions. The VERTEX Piston Kit 23119B delivers the durability and consistency you need to maintain peak power delivery...09100966- SKU:
- 09100966
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 125 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$156.95 -
VERTEX Piston Kit 22584B
VERTEX
$183.95The VERTEX Piston Kit 22584B delivers the reliability and performance precision you need for demanding engine builds. Whether you're upgrading displacement, increasing compression, or simply replacing worn components, this kit provides everything...09100970- SKU:
- 09100970
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$183.95 -
VERTEX Piston Kit 22805B
VERTEX
$256.95The VERTEX Piston Kit 22805B delivers the durability and precision your engine demands under extreme combustion pressures. Whether you're building a race engine or refreshing a high-mileage block, these pistons are engineered to handle sustained...09100971- SKU:
- 09100971
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
$256.95 -
VERTEX Piston Kit - Standard 22481CD
VERTEX
$106.95Piston durability and longevity directly impact engine reliability during sustained high-RPM operation. The VERTEX Piston Kit 22481CD delivers a proven combination of heat-treated construction and advanced surface coatings that reduce friction,...09100981- SKU:
- 09100981
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$106.95 -
On Sale
VERTEX Piston Kit 24275A
VERTEX
MSRP: $322.95Now: $207.00Was: $322.95Whether you're rebuilding a tired engine or pushing for peak performance, the VERTEX Piston Kit 24275A delivers the precision engineering and durability required for sustained high-RPM operation. These pistons combine advanced metallurgy with proven...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
MSRP: $322.95Now: $207.00Was: $322.95 -
VERTEX Piston Kit 24238B
VERTEX
$327.95The VERTEX Piston Kit 24238B delivers the durability and precision your engine demands, whether you're rebuilding after hard racing or seeking a reliable OEM replacement. Each piston undergoes rigorous T-5 heat treatment and is coated with molybdenum...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 24213B
VERTEX
$302.95The VERTEX Piston Kit 24213B delivers the durability and precision you need to maximize engine performance and extend top-end life, whether you're running cast or forged internals. Built with heat-treated aluminum and advanced surface coatings, these...09105144- SKU:
- 09105144
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$302.95 -
VERTEX Piston Kit 23757B
VERTEX
$289.95Whether you're rebuilding a tired engine or upgrading to a high-compression setup, the VERTEX Piston Kit 23757B delivers the precision engineering and durability required for demanding applications. These pistons are engineered to handle extended service...09103179- SKU:
- 09103179
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
$289.95 -
VERTEX Piston Kit 23249B
VERTEX
$223.95Piston durability directly impacts engine reliability and performance longevity. The VERTEX Piston Kit 23249B combines advanced heat-treatment metallurgy with factory-proven coatings to minimize wear during critical break-in periods and extend service...09102553- 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 23383B
VERTEX
$208.95Piston durability and break-in performance directly impact engine longevity and power delivery. The VERTEX Piston Kit 23383B combines advanced metallurgy with field-proven surface treatments to reduce friction during initial operation while maintaining...09102558- 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
$254.95Piston selection directly impacts your engine's reliability, power delivery, and longevity. The VERTEX Piston Kit 23375A delivers precision-engineered pistons with advanced metallurgy and coating technology, ensuring consistent performance whether you're...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
$254.95Whether you're rebuilding a high-mileage engine or stepping up to forged internals, the VERTEX Piston Kit 23375C delivers the precision and durability needed for reliable performance across the entire RPM range. The combination of advanced metallurgy,...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 -
Wiseco Wrist Pin for Yamaha YZ490 1982-1990 S277
WISECO
$23.95If you're running a YZ490 at the track or in competition, the integrity of your piston directly impacts your engine's reliability and peak power output. The Wiseco S277 wrist pin is engineered to handle the extreme combustion pressures and temperature...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
$23.95 -
Wiseco Wrist Pin for Honda CR125R 1987 Kawasaki KX100 1995-2009 Suzuki RM85 2002-2023 Yamaha YZ85 2002-2018 S288
WISECO
$23.95The Wiseco S288 wrist pin is engineered to handle the extreme demands of small-displacement racing engines, delivering the precision fit and durability that separates consistent power delivery from catastrophic failure. Whether you're rebuilding a...S288- SKU:
- S288
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- LENGTH METRIC:
- 54 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 14,00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 54 MM
- OUTSIDE DIAMETER METRIC:
- 14.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- APPLICATION:
- PISTON
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
$23.95
