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 VTKTC23564B
VERTEX
$315.95High-performance racing demands pistons engineered for extreme conditions—and the VERTEX Piston Kit VTKTC23564B delivers the durability and precision required for sustained boost, high RPM, and demanding track sessions. Every piston in this kit undergoes...09103785- SKU:
- 09103785
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
$315.95 -
VERTEX Piston Kit 23736B
VERTEX
$290.95A quality piston kit is the foundation of any reliable high-performance engine build. The VERTEX Piston Kit 23736B delivers the durability and precision needed to withstand extreme combustion pressures while maintaining consistent ring seal and minimal...09102615- SKU:
- 09102615
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 76.96 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$290.95 -
VERTEX Piston Kit 23342B
VERTEX
$302.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and sustained load. The VERTEX Piston Kit 23342B delivers the durability and precision fit your build demands, with materials and heat treatment...09102626- SKU:
- 09102626
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
VERTEX Piston Kit 23757A
VERTEX
$289.95High-performance pistons demand precision engineering and materials that withstand extreme combustion pressures and thermal cycles. The VERTEX Piston Kit 23757A delivers the durability and reliability required for both competitive racing and serious...09103178- SKU:
- 09103178
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
On Sale
Wiseco 48.50mm Piston Ring Set for Kawasaki KX85 2014-2024 1909CS
WISECO
MSRP: $27.51Now: $21.00Was: $27.51Proper 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: $27.51Now: $21.00Was: $27.51 -
On Sale
Wiseco Wrist Pin for Honda CR125R 1980-1984 Kawasaki KZ550D/H GPZ 1982-1983 Suzuki GSX-R600 2001-2003 S394
WISECO
MSRP: $23.95Now: $20.00Was: $23.95The Wiseco S394 wrist pin delivers the precision and durability demanded by high-performance 2-stroke and 4-stroke engines. Whether you're rebuilding a classic Honda CR125R or refreshing a modern Suzuki GSX-R600, this component ensures consistent power...S394- SKU:
- S394
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- APPLICATION:
- PISTON
- PRODUCT NAME:
- WRIST PIN
- UNITS:
- EACH
- LENGTH:
- 50 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 14,00 MM
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER METRIC:
- 14.00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH METRIC:
- 50 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $23.95Now: $20.00Was: $23.95 -
On Sale
Wiseco Wrist Pin 18mm x 47mm for Polaris 500 Classic 2003 S459
WISECO
MSRP: $22.99Now: $20.00Was: $22.99A wrist pin is a critical load-bearing component that connects your piston to the connecting rod—any wear or failure here directly compromises engine reliability and performance. The Wiseco S459 is engineered to OEM specifications for the Polaris 500...S459- SKU:
- S459
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH:
- 60 MM
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 60 MM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 18,00 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- ATV
- UNITS:
- EACH
MSRP: $22.99Now: $20.00Was: $22.99Qty in Cart: 0Quantity:Price:MSRP: $22.99Now: $20.00Was: $22.99Subtotal: -
On Sale
Wiseco Wrist Pin 15mm x 41mm for Honda CR125R 1988-2003 S467
WISECO
MSRP: $22.99Now: $20.00Was: $22.99The Wiseco S467 wrist pin is a precision-engineered component critical for maintaining piston stability and minimizing lateral wear in high-RPM applications. For Honda CR125R two-stroke engines, this pin directly impacts throttle response, engine...S467- SKU:
- S467
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- LENGTH METRIC:
- 54.5 MM
- OUTSIDE DIAMETER:
- 15,00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 15.00 MM
- UNITS:
- EACH
- LENGTH:
- 54,5 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
MSRP: $22.99Now: $20.00Was: $22.99 -
On Sale
Wiseco Wrist Pin 18mm x 52.7mm for KTM 300 EXC 1991-1994 S477
WISECO
MSRP: $22.99Now: $20.00Was: $22.99The wrist pin is a critical connecting component that transfers combustion forces from the piston to the connecting rod—when it fails, your engine fails. The Wiseco S477 is engineered to handle the extreme pressures and temperatures of high-revving...S477- SKU:
- S477
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- LENGTH METRIC:
- 52.7 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 18,00 MM
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- LENGTH:
- 52,7 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
MSRP: $22.99Now: $20.00Was: $22.99 -
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 Honda CRF150F 2006-2017 58mm 10:1 40132M05800
WISECO
MSRP: $154.95Now: $132.00Was: $154.95If you're rebuilding or refreshing your Honda CRF150F's engine, a quality piston kit is non-negotiable—it directly impacts compression ratio, power delivery, and engine longevity. The Wiseco 58mm forged piston delivers the precision fit and material...09103947- SKU:
- 09103947
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 58.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 58.00 MM
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
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 TTR250 1999-2006 74mm Piston Kit 10.5:1 Compression 4689M07400
WISECO
MSRP: $194.95Now: $166.00Was: $194.95If you're running a TTR250 and demand reliable power delivery whether you're hammering the trail or competing on the track, the Wiseco 4689M07400 piston kit delivers the compression ratio and durability you need. High-silicon alloy construction resists...4689M07400- SKU:
- 4689M07400
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 74.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 249 CC
- PISTON DIAMETER METRIC:
- 73.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 59.60 MM
MSRP: $194.95Now: $166.00Was: $194.95Qty in Cart: 0Quantity:Price:MSRP: $194.95Now: $166.00Was: $194.95Subtotal: -
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: $388.95Qty in Cart: 0Quantity:Price:MSRP: $388.95Now: $323.00Was: $388.95Subtotal: -
On Sale
Wiseco Piston Kit Racer Elite Suzuki RMZ450 2008-2012 RE814M09600
WISECO
MSRP: $379.95Now: $323.00Was: $379.95If you're serious about squeezing maximum power out of your RMZ450, piston quality directly impacts your engine's ability to handle high RPMs and produce consistent power. The Wiseco Racer Elite delivers a 14:1 compression ratio with precision-machined...09105067- SKU:
- 09105067
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 96.00 MM
MSRP: $379.95Now: $323.00Was: $379.95Qty in Cart: 0Quantity:Price:MSRP: $379.95Now: $323.00Was: $379.95Subtotal: -
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 Husqvarna TC65 2017-2022 RE920M04500
WISECO
MSRP: $171.95Now: $119.00Was: $171.95If you're running a TC65 at the limit, factory pistons won't cut it. The Wiseco Racer Elite piston kit is purpose-built for the demands of competitive two-stroke racing, delivering the strength, precision, and reliability needed to stay on top. With...09105100- SKU:
- 09105100
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
MSRP: $171.95Now: $119.00Was: $171.95Qty in Cart: 0Quantity:Price:MSRP: $171.95Now: $119.00Was: $171.95Subtotal: -
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 48mm Piston Kit for 1985-1988 1990-1991 Honda XR80R PK1277
WISECO
MSRP: $179.95Now: $153.00Was: $179.95If you're rebuilding or refreshing your XR80R's top end, a quality piston kit is non-negotiable—it's the foundation of reliable power and engine longevity. Wiseco's forged-aluminum construction handles the thermal stress of 2-stroke performance while...09030229- SKU:
- 09030229
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 47.97 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
MSRP: $179.95Now: $153.00Was: $179.95Qty in Cart: 0Quantity:Price:MSRP: $179.95Now: $153.00Was: $179.95Subtotal: -
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
