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
-
On Sale
Wossner Piston Kit 66.35mm Kawasaki KX250 2002-2004 8088DB
WOSSNER
MSRP: $150.96Now: $143.41Was: $150.96If you're running a KX250 two-stroke, piston wear directly impacts combustion efficiency, throttle response, and engine longevity. The Wössner 8088DB replaces worn internals with German-engineered...09104810- SKU:
- 09104810
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- STANDARD SERIES
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- PISTON SIZE METRIC:
- 66.35 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
MSRP: $150.96Now: $143.41Was: $150.96 -
VERTEX Piston Kit 23641B
VERTEX
$302.95The VERTEX Piston Kit 23641B delivers the precision engineering and material science your engine demands for reliable, high-rpm performance. Whether you're rebuilding a two-stroke powerplant or...09102568- SKU:
- 09102568
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
On Sale
ATHENA Piston Kit S4F102000040
ATHENA
MSRP: $284.95Now: $256.00Was: $284.95Whether you're chasing lap times or rebuilding after catastrophic failure, piston quality directly determines engine reliability and peak performance. The ATHENA S4F102000040 uses the same premium...09102539- SKU:
- 09102539
- Availability:
- Ships Same Business Day
- Weight:
- 1.04 LBS
- PISTON DIAMETER METRIC:
- 101.96 MM
- COMPRESSION RATIO IMPERIAL:
- 12.2:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE SIZE METRIC:
- 101.96 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- REPLACEMENT FORGED PISTON
MSRP: $284.95Now: $256.00Was: $284.95 -
VERTEX Piston Kit 23564B
VERTEX
$256.95The VERTEX Piston Kit 23564B delivers the durability and precision needed for consistent high-RPM performance, whether you're rebuilding a stock engine or pushing peak power limits. Built with...09102085- SKU:
- 09102085
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
$256.95Qty in Cart: 0Quantity:Price:$256.95Subtotal: -
VERTEX Piston Kit 22216A
VERTEX
$165.95The VERTEX Piston Kit 22216A is engineered for builders who demand reliability and performance without compromise. Whether you're rebuilding a stock engine or pushing displacement limits, these...09102077- SKU:
- 09102077
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
$165.95Qty in Cart: 0Quantity:Price:$165.95Subtotal: -
VERTEX Piston Kit 23205500
VERTEX
$165.95A precision piston kit designed for builders who demand reliability under extreme combustion pressures and extended engine cycles. The VERTEX 23205500 combines metallurgical excellence with a...09102076- SKU:
- 09102076
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 53.00 MM
- STYLE:
- CAST BIG BORE
- UNITS:
- KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 103 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 52.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$165.95Qty in Cart: 0Quantity:Price:$165.95Subtotal: -
VERTEX Piston Kit 23329B
VERTEX
$302.95A piston kit is only as good as its heat treatment and surface preparation—two areas where VERTEX doesn't compromise. The 23329B delivers the durability and reliability you need for sustained...09101007- SKU:
- 09101007
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
$302.95 -
VERTEX Piston Kit - Standard 22541B
VERTEX
$302.95Precision piston construction directly impacts engine reliability, power delivery, and longevity under sustained racing conditions. The VERTEX Piston Kit 22541B combines advanced heat treatment with...09101003- SKU:
- 09101003
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 77.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- DISPLACEMENT:
- 360 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06600002C
ATHENA
MSRP: $109.95Now: $99.00Was: $109.95The ATHENA Piston Kit S4F06600002C delivers the precision and durability demanded by competitive racers and serious engine builders. Built from the same 2618 silicium alloy used in Formula 1...09100452- SKU:
- 09100452
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 65.96 MM
- DISPLACEMENT:
- 198 CC
- PISTON HEAD SHAPE:
- FLAT TOP
- TYPE:
- C
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
MSRP: $109.95Now: $99.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $99.00Was: $109.95Subtotal: -
On Sale
ATHENA Piston Kit S4C05400010A
ATHENA
MSRP: $133.95Now: $109.00Was: $133.95A quality piston kit is the foundation of reliable engine performance, directly affecting compression, durability, and power delivery. The ATHENA Piston Kit S4C05400010A delivers precision-engineered...09100253- SKU:
- 09100253
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON SIZE METRIC:
- STANDARD SIZE A
- STYLE:
- STANDARD BORE
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 14.8:1
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON
MSRP: $133.95Now: $109.00Was: $133.95 -
On Sale
ATHENA Piston Kit S4F07200001A
ATHENA
MSRP: $225.95Now: $203.00Was: $225.95Precision matters when you're pushing your engine to its limits. The ATHENA Piston Kit S4F07200001A delivers the same metallurgical engineering found in Formula 1 powerplants, engineered with forged...09100172- SKU:
- 09100172
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
- BORE SIZE METRIC:
- 71.93 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- COMPRESSION RATIO IMPERIAL:
- STOCK
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $225.95Now: $203.00Was: $225.95Qty in Cart: 0Quantity:Price:MSRP: $225.95Now: $203.00Was: $225.95Subtotal: -
On Sale
ATHENA Piston Kit S4F06640007A
ATHENA
MSRP: $164.95Now: $148.00Was: $164.95Maximum engine reliability demands pistons engineered to withstand extreme combustion pressures and thermal cycling without compromise. The ATHENA Piston Kit S4F06640007A delivers the precision and...09100131- SKU:
- 09100131
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
- COMPRESSION RATIO IMPERIAL:
- STOCK
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.34 MM
- PISTON HEAD SHAPE:
- FLAT TOP
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- A
MSRP: $164.95Now: $148.00Was: $164.95 -
Wiseco Engine Rebuild Kit 2002-2006 KTM 125 SX PWR153-101
WISECO
$721.95When your KTM 125 SX's engine shows signs of wear, a complete rebuild using OEM-quality components is the most cost-effective path to restoring full performance and reliability. The Wiseco PWR153-101...09031616- SKU:
- 09031616
- Availability:
- Ships Same Business Day
- Weight:
- 10.55 LBS
- BORE SIZE METRIC:
- 54.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$721.95Qty in Cart: 0Quantity:Price:$721.95Subtotal: -
Wiseco Engine Rebuild Kit for 2004-2012 KTM 85 SX PWR162-100
WISECO
$543.95Complete engine rebuilds demand precision components that restore both reliability and power output. The Wiseco Engine Rebuild Kit for your 2004-2012 KTM 85 SX delivers OEM-quality parts in a single...09031540- SKU:
- 09031540
- Availability:
- Ships Same Business Day
- Weight:
- 7.70 LBS
- BORE SIZE METRIC:
- 47.00 MM
- FEATURES:
- GP SERIES PISTON
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$543.95Qty in Cart: 0Quantity:Price:$543.95Subtotal: -
Wiseco 56mm Piston Kit with Gaskets for KTM 125 SX 2002-2006 PK1513
WISECO
$234.95When your KTM 125 SX's top-end reaches the end of its service life, a quality piston kit is non-negotiable. Wiseco's PK1513 delivers the precision engineering and material quality you need to restore...09030700- SKU:
- 09030700
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- PISTON DIAMETER METRIC:
- 55.95 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 56.00 MM
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
$234.95Qty in Cart: 0Quantity:Price:$234.95Subtotal: -
Pro Filter Replacement Oil Filter Ducati 1098 2007-2008 PF-153
PRO FILTER
$11.99Your Ducati 1098's engine depends on consistent, reliable filtration to maintain peak performance and longevity. The PRO FILTER PF-153 exceeds OEM specifications with advanced micro-pore filtration...07120587- SKU:
- 07120587
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- PREMIUM
$11.99 -
Pro Filter Yamaha YZ250F 2009-2024 Oil Filter PF-140
PRO FILTER
$6.99Consistent oil filtration is critical to YZ250F engine longevity, especially during high-rpm racing or aggressive trail riding where contaminants accumulate rapidly. The Pro Filter PF-140 delivers...07120577- SKU:
- 07120577
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
- STYLE:
- PREMIUM
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- UTV
- BASE FINISH:
- CHROME
- RIDING STYLE:
- OFF-ROAD
$6.99 -
Pro Filter Replacement Oil Filter for Honda TRX250 FourTrax 1985-1987 PF-113
PRO FILTER
$6.99Engine oil filtration directly impacts longevity and performance—contaminated oil accelerates wear on critical internal components, particularly in high-demand applications like recreational riding...07120563- SKU:
- 07120563
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE FINISH:
- CHROME
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- ATV
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- STYLE:
- PREMIUM
$6.99 -
WSM Oil Injection Block Off Plate 011-206
WSM
$14.36If you're running a carbureted or naturally aspirated engine without a factory oil injection system, blocking off the unused port is essential for maintaining clean intake pathways and preventing...011206- SKU:
- 011206
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- ELIMINATION KIT
- TYPE:
- OIL INJECTION
- MATERIAL:
- BILLET ALUMINUM
$14.36 -
PARTS UNLIMITED Oil Filter 16510-37440
PARTS UNLIMITED
$7.09A quality oil filter is non-negotiable for engine longevity and performance. The PARTS UNLIMITED Pro Series 16510-37440 uses premium German filtration media paired with precision-engineered gaskets...010015- SKU:
- 010015
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- COLOR/FINISH:
- YELLOW
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- BASE COLOR:
- YELLOW
- FILTER MEDIA MATERIAL:
- PAPER
$7.09Qty in Cart: 0Quantity:Price:$7.09Subtotal:
