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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- Price
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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...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...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,...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...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...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...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...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...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...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...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...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...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...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...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 -
Wiseco Piston Kit Yamaha XT500 1976-1981 4764M08700
WISECO
$239.95If you're running a classic Yamaha XT500, TT500, or SR500, factory pistons won't cut it if you're serious about reliability and power. The Wiseco 4764M08700 delivers a noticeable bump in combustion...09102923- SKU:
- 09102923
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 87.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 499 CC
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$239.95 -
Wiseco 88mm 9:1 Piston Kit for Yamaha XT500 1976-1981 4764M08800
WISECO
$239.95If you're running a classic Yamaha single-cylinder and want to unlock better combustion efficiency without sacrificing reliability, the Wiseco 4764M08800 delivers the precision engineering that...09102924- SKU:
- 09102924
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE SIZE METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 499 CC
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$239.95 -
Wiseco Piston Kit Honda CRF450R 2017 4978M09600
WISECO
$232.95If you're running a Honda CRF450R and want to unlock serious power gains without compromising reliability, a quality piston kit is non-negotiable. Wiseco's 4978M09600 delivers the compression ratio...09102933- SKU:
- 09102933
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- DISPLACEMENT:
- 449 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
$232.95 -
Wiseco Piston Kit Honda CRF250R 2004-2007 4984M08200
WISECO
$264.95Stock pistons in your CRF250R can't handle sustained performance demands, limiting your engine's potential on the track or trail. Wiseco's 4984M08200 kit delivers measurable gains in throttle...09102938- SKU:
- 09102938
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE - OVERSIZE:
- +4,00 MM
- BORE SIZE METRIC:
- 82.00 MM
- DISPLACEMENT:
- 276 CC
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 52.20 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$264.95 -
Wiseco Piston Kit Honda XR650L 1993-2017 10.5:1 101mm Bore 4989M10100
WISECO
$248.95If you're running a Honda XR650L that's seen serious miles, piston wear directly impacts throttle response, compression, and overall reliability. The Wiseco 4989M10100 restores—and exceeds—factory...09102940- SKU:
- 09102940
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- STROKE LENGTH METRIC:
- 82.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 101.00 MM
- DISPLACEMENT:
- 650 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
$248.95 -
Wiseco Piston Kit 90mm 12.2:1 Compression for Suzuki DR-Z400 2000-2004 4713M09000
WISECO
$238.95If you're running a Suzuki DR-Z400 and want measurable gains in power output without sacrificing engine longevity, a quality piston upgrade is one of the most direct paths to that goal. The Wiseco...4713M09000- SKU:
- 4713M09000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 398 CC
- PISTON DIAMETER METRIC:
- 89.92 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.60 MM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- ATV
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 90.00 MM
$238.95
