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 - Standard 22498B
VERTEX
$176.95Quality pistons are the foundation of reliable engine performance, especially if you're pushing your build to higher RPMs or boost levels. The VERTEX Piston Kit 22498B delivers the durability and precision you need for consistent power delivery without...09101055- SKU:
- 09101055
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST RACE
$176.95Qty in Cart: 0Quantity:Price:$176.95Subtotal: -
VERTEX Piston Kit - Standard 22248B
VERTEX
$141.95A quality piston kit is the foundation of reliable engine performance, especially under high RPM and boost conditions. The VERTEX Piston Kit 22248B combines precision engineering with proven durability features that reduce wear during critical break-in...09101053- SKU:
- 09101053
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STYLE:
- CAST REPLICA
$141.95Qty in Cart: 0Quantity:Price:$141.95Subtotal: -
VERTEX Piston Kit - Standard 22499B
VERTEX
$118.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Standard 22499B delivers the durability and precision required for both street and track applications. The advanced T-5 heat treatment and molybdenum disulfide coating...09101023- SKU:
- 09101023
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 46.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 80 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$118.95 -
VERTEX Piston Kit 23381B
VERTEX
$327.95The VERTEX Piston Kit 23381B delivers the durability and precision required for sustained high-RPM performance and reliability across demanding racing and modified engine applications. With factory-grade heat treatment and a specialized piston skirt...09101020- SKU:
- 09101020
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
$327.95Qty in Cart: 0Quantity:Price:$327.95Subtotal: -
VERTEX Piston Kit 22942B
VERTEX
$327.95If you're building a high-revving engine or pushing your existing platform to the next level, piston quality directly impacts reliability and longevity under sustained load. The VERTEX Piston Kit 22942B delivers OEM-grade durability with purpose-built...09101017- SKU:
- 09101017
- Availability:
- Ships Same Business Day
- Weight:
- 0.92 LBS
$327.95 -
VERTEX Piston Kit 23379B
VERTEX
$302.95High-revving engines demand pistons engineered for sustained performance under extreme conditions. The VERTEX Piston Kit 23379B combines advanced metallurgy with precision surface coatings to deliver reliable power delivery and extended component life...09101012- SKU:
- 09101012
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$302.95 -
VERTEX Piston Kit 23235A
VERTEX
$302.95A quality piston kit is foundational to engine reliability and performance—especially if you're running higher boost levels or extended track sessions. The VERTEX Piston Kit 23235A delivers the durability and precision fit that serious racers and...09101004- SKU:
- 09101004
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
VERTEX Piston Kit 22925B
VERTEX
$242.95Piston failure is one of the most costly engine catastrophes—and the VERTEX Piston Kit 22925B eliminates the guesswork with OEM-quality construction and race-proven durability. The combination of precision heat treatment and low-friction coating means...09100992- SKU:
- 09100992
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 63.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$242.95 -
On Sale
ATHENA Piston Kit S5F08300005B
ATHENA
MSRP: $256.95Now: $231.00Was: $256.95Whether you're rebuilding a high-revving two-stroke or fortifying a four-stroke engine, piston quality directly impacts power delivery, longevity, and reliability under extreme conditions. The ATHENA Piston Kit S5F08300005B delivers the precision and...09100884- SKU:
- 09100884
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- B
- BORE SIZE METRIC:
- 82.96 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $256.95Now: $231.00Was: $256.95 -
On Sale
ATHENA Piston Kit S4C05800002B
ATHENA
MSRP: $242.95Now: $219.00Was: $242.95A high-performance piston kit is essential for engines pushing beyond stock limits—whether you're building a race engine or restoring a worn block. The ATHENA S4C05800002B delivers OEM-equivalent quality with precision-engineered components that ensure...09100878- SKU:
- 09100878
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 57.95 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- STYLE:
- BIG BORE
- PRODUCT NAME:
- PISTON
MSRP: $242.95Now: $219.00Was: $242.95Qty in Cart: 0Quantity:Price:MSRP: $242.95Now: $219.00Was: $242.95Subtotal: -
On Sale
ATHENA Piston Kit S4C05800002A
ATHENA
MSRP: $242.95Now: $219.00Was: $242.95A quality piston kit is the foundation of reliable engine performance, whether you're rebuilding for increased displacement or restoring original specs. The ATHENA S4C05800002A delivers precision-engineered pistons with matched rings, clips, and...09100877- SKU:
- 09100877
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- STANDARD SIZE A
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 57.94 MM
- STYLE:
- BIG BORE
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON
MSRP: $242.95Now: $219.00Was: $242.95Qty in Cart: 0Quantity:Price:MSRP: $242.95Now: $219.00Was: $242.95Subtotal: -
Wiseco Piston Kit Standard 66mm 12.2:1 Honda CRF150R 2007-2009 4924M06600
WISECO
$239.95Stock pistons wear out, especially in high-RPM racing environments—Wiseco's forged aluminum construction and moly-coated skirts deliver the durability and heat resistance you need for consistent performance lap after lap. The 12.2:1 compression ratio...09100821- SKU:
- 09100821
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 43.70 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- MOLY COATED
- BORE SIZE METRIC:
- 66.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.2:1
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
Wiseco Piston Kit Standard Bore 66mm 11.7:1 Compression Honda CRF150R 2007-2009 4915M06600
WISECO
$199.95When your CRF150R's OEM piston reaches its limit, a quality rebuild is the difference between a sluggish engine and one that delivers crisp throttle response and reliable power. The Wiseco 4915M06600 replaces worn internals with precision-engineered...09100819- SKU:
- 09100819
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- STROKE LENGTH METRIC:
- 43.70 MM
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- SKIRT COATING:
- MOLY COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
On Sale
ATHENA Piston Kit S5F08300002B
ATHENA
MSRP: $245.95Now: $221.00Was: $245.95A piston kit is the heart of any rebuild—getting the right one ensures reliable compression, proper ring sealing, and consistent power delivery across your entire RPM range. The ATHENA Piston Kit S5F08300002B delivers OEM-quality construction with...09100727- SKU:
- 09100727
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 82.96 MM
- PISTON SIZE METRIC:
- STANDARD SIZE B
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- PRODUCT NAME:
- PISTON
MSRP: $245.95Now: $221.00Was: $245.95Qty in Cart: 0Quantity:Price:MSRP: $245.95Now: $221.00Was: $245.95Subtotal: -
On Sale
ATHENA Piston Kit S4F10000007A
ATHENA
MSRP: $240.95Now: $217.00Was: $240.95A precision piston kit is fundamental to engine reliability and performance—poor quality pistons lead to blow-by, reduced compression, and catastrophic failure under load. The ATHENA S4F10000007A delivers OEM-equivalent dimensional accuracy and material...09100255- SKU:
- 09100255
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.6:1
- PISTON SIZE METRIC:
- STANDARD SIZE A
- PISTON DIAMETER METRIC:
- 99.95 MM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
MSRP: $240.95Now: $217.00Was: $240.95Qty in Cart: 0Quantity:Price:MSRP: $240.95Now: $217.00Was: $240.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06900001C
ATHENA
MSRP: $162.95Now: $147.00Was: $162.95High-performance pistons demand materials engineered to withstand extreme combustion pressures and thermal stress—the ATHENA Piston Kit S4F06900001C delivers exactly that using the same 2618 silicium alloy found in Formula 1 engines. Precision forging...09100170- SKU:
- 09100170
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 220 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 68.96 MM
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- C
- UNITS:
- KIT
MSRP: $162.95Now: $147.00Was: $162.95 -
On Sale
ATHENA Piston Kit S4F06900001A
ATHENA
MSRP: $162.95Now: $147.00Was: $162.95Maximum engine longevity and consistent peak performance demand pistons engineered to the exact tolerances of professional racing applications. The ATHENA Piston Kit S4F06900001A delivers the same material science trusted in Formula 1 competition,...09100168- SKU:
- 09100168
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 220 CC
- TYPE:
- A
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 68.94 MM
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
MSRP: $162.95Now: $147.00Was: $162.95 -
Wiseco Engine Rebuild Kit for 2009-2020 KTM 65 SX PWR161B-100
WISECO
$532.95When your KTM 65 SX needs more than a top-end refresh, a complete engine rebuild restores lost compression, eliminates wear in critical bearings, and brings your bike back to factory performance specs. The Wiseco PWR161B-100 kit eliminates the guesswork...09031539- SKU:
- 09031539
- Availability:
- Ships Same Business Day
- Weight:
- 7.05 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- OVERBORE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 45.00 MM
- DISPLACEMENT:
- 65 CC
- FEATURES:
- PROLITE® PISTON
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$532.95 -
Wiseco 4-Stroke Forged Piston Kit 95mm 11:1 CR for KTM 520 EXC 2000-2002 520 SX 2000-2002 525 SX 2003-2006 525 XC 2008-2010 PK1850
WISECO
$392.95If you're rebuilding a KTM 4-stroke or pushing your bike to competitive limits, piston quality directly impacts engine longevity and throttle response. The Wiseco PK1850 pairs aerospace-grade forged aluminum with precision engineering to deliver the...09031161- SKU:
- 09031161
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 95.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 510 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 94.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$392.95 -
Wiseco Piston Kit with Gasket for Yamaha YZ125 2005-2020 PK1572
WISECO
$224.95The Wiseco PK1572 is engineered for 2-stroke riders who refuse to compromise on reliability or performance. Whether you're chasing lap times or putting in trail miles, a worn piston and ring pack will rob you of power and throttle response—this complete...09031160- SKU:
- 09031160
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 134 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
$224.95
