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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- Qty in Cart
- Quantity
- Price
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VERTEX Piston Kit 23430CD
VERTEX
$104.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Piston Kit 23430CD delivers the durability and heat resistance required for sustained racing demands. The advanced T-5 heat treatment process ensures...09101835- SKU:
- 09101835
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- DISPLACEMENT:
- 65 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 44.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$104.95 -
VERTEX Piston Kit 22459B
VERTEX
$218.95A quality piston kit is fundamental to engine longevity and reliable performance under load. The VERTEX Piston Kit 22459B delivers precision engineering with heat-treated construction and a specialized skirt coating designed to reduce friction during...09100995- SKU:
- 09100995
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- CYLINDER DIAMETER METRIC:
- 67.50 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON DIAMETER METRIC:
- 67.45 MM
$218.95 -
VERTEX Piston Kit - Standard 22649B
VERTEX
$207.95High-quality pistons are critical to maintaining ring seal integrity and consistent compression across the power stroke—especially in high-rpm or forced-induction applications. The VERTEX Piston Kit 22649B delivers precision engineering with advanced...09100996- SKU:
- 09100996
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.35 MM
$207.95 -
VERTEX Piston Kit - Standard 22909B
VERTEX
$223.95If you're building or rebuilding an engine that demands reliability under sustained high RPM and boost conditions, quality pistons are non-negotiable. The VERTEX Piston Kit 22909B delivers the durability and performance characteristics you need to avoid...09100998- SKU:
- 09100998
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- 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
- CYLINDER DIAMETER METRIC:
- 66.40 MM
$223.95 -
On Sale
VERTEX Piston Kit 24189A
VERTEX
MSRP: $322.95Now: $207.00Was: $322.95Engine reliability hinges on piston quality—weak or worn pistons compromise compression, efficiency, and longevity across your entire power band. The VERTEX Piston Kit 24189A delivers OEM-level durability with forged 2618 aluminum construction and proven...09104666- SKU:
- 09104666
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- GP RACER'S CHOICE
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- PISTON DIAMETER METRIC:
- 95.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
MSRP: $322.95Now: $207.00Was: $322.95 -
VERTEX Piston Kit 24267B
VERTEX
$256.95Whether you're rebuilding a tired top end or preparing for competition, piston quality directly impacts engine longevity, reliability, and peak performance. The VERTEX Piston Kit 24267B delivers OEM-grade construction with heat-treated,...09105175- SKU:
- 09105175
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$256.95 -
VERTEX Piston Kit 24142A
VERTEX
$327.95The VERTEX Piston Kit 24142A delivers the durability and precision needed for sustained high-RPM performance, whether you're rebuilding a stock engine or pushing for peak power gains. With premium forged and cast options engineered for different...09105186- SKU:
- 09105186
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON DIAMETER METRIC:
- 80.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- DISPLACEMENT:
- 270 CC
- STYLE:
- FORGED BIG BORE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$327.95 -
VERTEX Piston Kit VTKTC22983B
VERTEX
$310.95OEM pistons often fail under sustained high-RPM load, leaving you stranded or facing catastrophic engine damage. The VERTEX Piston Kit VTKTC22983B delivers competition-grade durability through advanced heat treatment and premium surface coatings,...09103725- SKU:
- 09103725
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
$310.95 -
VERTEX Piston Kit - High Compression VTKTC23113B
VERTEX
$341.95High-compression pistons are essential for maximizing power output in forced induction and high-revving naturally aspirated builds, and the VERTEX Piston Kit delivers the durability and precision required for sustained performance. The T-5 heat-treatment...09103737- SKU:
- 09103737
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
$341.95 -
On Sale
Wiseco 48.50mm Piston Ring Set for Kawasaki KX85 2014-2024 1909CS
WISECO
MSRP: $25.95Now: $21.00Was: $25.95Proper ring sealing is critical for maximizing compression, controlling blowby, and maintaining peak power delivery in your KX85. The Wiseco 1909CS ring set delivers precision engineering that ensures consistent performance across the entire RPM range,...1909CS- SKU:
- 1909CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- DISPLACEMENT:
- 84,7 CC
- BORE SIZE METRIC:
- 48.50 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
Wiseco Wrist Pin Honda TRX300 FourTrax 1988-2000 S523
WISECO
MSRP: $23.99Now: $20.00Was: $23.99The wrist pin is a critical component that transfers combustion forces from the piston to the connecting rod, making it essential for reliable power delivery and engine longevity. A quality wrist pin like the Wiseco S523 minimizes deflection and wear,...S523- SKU:
- S523
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 17,00 MM
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 17.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- APPLICATION:
- PISTON
- LENGTH:
- 59,50 MM
- LENGTH METRIC:
- 59.50 MM
- PRODUCT NAME:
- WRIST PIN
MSRP: $23.99Now: $20.00Was: $23.99 -
On Sale
Wiseco Piston Kit Husqvarna FC450 2014-2022 RE805M09500
WISECO
MSRP: $388.95Now: $323.00Was: $388.95The Wiseco Piston Kit RE805M09500 is engineered to deliver measurable gains in throttle response and peak torque output for your Husqvarna FC450. Whether you're pushing for podium finishes or maximizing your bike's potential on the track, this complete...09105061- SKU:
- 09105061
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 95.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
MSRP: $388.95Now: $323.00Was: $388.95 -
On Sale
Wiseco Piston Kit Honda CRF450R 2017-2025 RE813M09600
WISECO
MSRP: $388.95Now: $323.00Was: $388.95A stock piston won't cut it when you're pushing your CRF450R to its limits. The Wiseco Racer Elite Piston Kit delivers the compression ratio, durability, and friction reduction your engine needs to convert fuel into consistent power gains—whether you're...09105066- SKU:
- 09105066
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
MSRP: $388.95Now: $323.00Was: $388.95 -
On Sale
Wiseco Piston Yamaha YZF-R1 1998-2025 0.50mm 451M08550
WISECO
MSRP: $243.95Now: $200.00Was: $243.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and overall engine longevity—making piston replacement a critical maintenance item for any YZF-R1 owner serious about performance. The Wiseco 451M08550 delivers...451M08550- SKU:
- 451M08550
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- DISPLACEMENT:
- 465 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 85.42 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 85.50 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $243.95Now: $200.00Was: $243.95 -
On Sale
Wiseco Piston Kit with Gaskets 55mm 2001 Yamaha YZ125 PK1350
WISECO
MSRP: $209.95Now: $178.00Was: $209.95When you're running a 2-cycle engine hard, piston failure isn't just an inconvenience—it's a race-ender. The Wiseco Piston Kit delivers the thermal stability and durability you need to keep your YZ125 performing at the edge without worrying about seizure...09030228- SKU:
- 09030228
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 54.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 55.00 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $209.95Now: $178.00Was: $209.95 -
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 the strength and thermal stability required to handle...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 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 strength and precision you need to handle sustained high...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 complete piston kit eliminates guesswork by including...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: $181.95 -
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 sustained high RPM conditions. This complete kit...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: $225.95 -
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 aluminum alloy, this piston handles sustained combustion...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
