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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Hot Cams Valve Shim 7.48mm x 2.10mm for Honda CRF150R 2007-2016 5PK748210
HOT CAMS
$10.95Valve clearance directly impacts your CRF150R's horsepower delivery, fuel efficiency, and engine longevity. Hot Cams valve shims are precision-engineered to maintain exact tolerances, preventing...09261320- SKU:
- 09261320
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.10 MM
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$10.95 -
Hot Cams Valve Shim 7.48mm x 2.15mm for Honda CRF 150R 2007-2018 5PK748215
HOT CAMS
$10.95Valve shim clearance directly impacts cam timing accuracy and engine responsiveness—neglect it, and you'll lose horsepower and risk valve damage. The Hot Cams 7.48mm x 2.15mm Valve Shim pack gives...09261321- SKU:
- 09261321
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- VALVE SHIM THICKNESS METRIC:
- 2.15 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 9.48mm x 3.05mm for Honda CRF450R 2002-2018 5PK948305
HOT CAMS
$10.95Valve shim wear directly impacts engine efficiency and responsiveness. Hot Cams Valve Shims maintain precise valve clearance, which is critical for proper combustion timing and consistent performance...09261409- SKU:
- 09261409
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 3.05 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim 7.48mm x 3.25mm for Honda CRF150R 2007-2019 5PK748325
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—and improper shim selection compromises all three. This HOT CAMS 5-pack gives you precise adjustment options...09261343- SKU:
- 09261343
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- VALVE SHIM THICKNESS METRIC:
- 3.25 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
$10.95 -
VERTEX Piston Kit with Gaskets VTK22795B
VERTEX
$289.95High-compression forged pistons are essential for unlocking additional power and torque across your engine's entire RPM range—especially if you're building for sustained performance or forced...09103363- SKU:
- 09103363
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit with Gaskets VTK22520B
VERTEX
$208.95A quality piston kit is fundamental to reliable engine performance, especially under high-load conditions where OEM components often fall short. The VERTEX VTK22520B delivers forged construction with...09103379- SKU:
- 09103379
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$208.95 -
VERTEX Piston Kit VTK23004B
VERTEX
$223.95Whether you're building a high-RPM engine or refreshing a tired block, VERTEX pistons deliver the durability and precision needed for sustained performance. The T-5 heat treatment cycle ensures these...09103073- SKU:
- 09103073
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
$223.95 -
VERTEX Piston Circlips - 4-Stroke 72075K
VERTEX
$3.95Piston circlips are critical retention components that keep your piston rings seated and functioning under extreme combustion pressures—failure here means catastrophic engine damage. When rebuilding...09130057- SKU:
- 09130057
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- UTV
- APPLICATION:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
- RIDING STYLE:
- ATV
$3.95 -
VERTEX Piston Ring 53010005400
VERTEX
$30.95Factory piston rings wear down through normal engine operation, causing blow-by, loss of compression, and reduced power output. VERTEX Piston Ring 53010005400 restores your engine's sealing integrity...09120170- SKU:
- 09120170
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 53.96 MM
$30.95 -
VERTEX Piston Kit 23628A
VERTEX
$177.95OEM pistons wear out—especially in high-demand racing and forced-induction applications. The VERTEX Piston Kit 23628A delivers precision-engineered pistons with advanced surface treatments that...09102113- SKU:
- 09102113
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST BIG BORE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 52.44 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- DISPLACEMENT:
- 104 CC
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$177.95 -
VERTEX Piston Kit 22996B
VERTEX
$171.95The VERTEX Piston Kit 22996B delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding a worn top end. Engineered with forged 2618 aluminum and a T-5...09102127- SKU:
- 09102127
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.93 MM
- STYLE:
- CAST RACE
$171.95 -
VERTEX Piston Kit 22567A
VERTEX
$262.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and boost conditions. The VERTEX Piston Kit 22567A delivers the precision engineering and...09101902- SKU:
- 09101902
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
$262.95 -
On Sale
Wiseco Wrist Pin Honda CB350F 1972-1973 S522
WISECO
MSRP: $25.95Now: $20.00Was: $25.95The Wiseco S522 wrist pin is engineered for Honda CB350F engines that demand reliable performance under sustained high RPM operation. Whether you're rebuilding a vintage racer or restoring your...S522- SKU:
- S522
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH METRIC:
- 57.8 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 15,00 MM
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 57,8 MM
- OUTSIDE DIAMETER METRIC:
- 15.00 MM
- PRODUCT NAME:
- WRIST PIN
- UNITS:
- EACH
MSRP: $25.95Now: $20.00Was: $25.95 -
On Sale
Wiseco 2-Stroke Piston Kit 58mm Standard Bore for 2016-2017 KTM 150 SX RE909M05800
WISECO
MSRP: $221.95Now: $174.00Was: $221.95The Wiseco 2-Stroke Piston Kit is engineered to maximize performance and reliability in your 2016-2017 KTM 150 SX, delivering the precision fitment and durability that competitive and recreational...09105103- SKU:
- 09105103
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- BORE SIZE METRIC:
- 58.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX100 1998-2013 PK1154
WISECO
MSRP: $192.95Now: $149.00Was: $192.95Wiseco's forged piston kits deliver the durability and precision needed for competitive KX100 racing and high-performance riding. If you're serious about engine reliability at peak RPMs, this...09030310- SKU:
- 09030310
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 52.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 99 CC
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 52.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.80 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $192.95Now: $149.00Was: $192.95 -
Wiseco Top End Bearing Kawasaki KDX200 1986-2006 B1008
WISECO
$25.95Top-end bearing wear accelerates engine deterioration and reduces reliability on the track or trail. The Wiseco B1008 delivers precision-engineered durability built specifically for KDX200 engines,...B1008- SKU:
- B1008
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- TOP END
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 18 MM
- LENGTH METRIC:
- 22 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$25.95 -
Wiseco Piston Kit Standard Bore 96mm 12:1 Compression Honda CRF450R 2002-2008 4820M09600
WISECO
$232.95Factory pistons wear down, and a degraded top-end robs your CRF450R of responsiveness and reliability. The Wiseco Piston Kit restores lost compression and throttle response while delivering the...09100334- SKU:
- 09100334
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- ENGINE TYPE:
- 4-STROKE
- STROKE LENGTH METRIC:
- 62.10 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
$232.95 -
Wiseco Piston Kit 102.40mm 9:1 Compression Honda XR650L 1993-2020 4562M10241
WISECO
$296.95If you're running an XR650L and want measurable gains in displacement and compression efficiency, a properly sized piston kit is fundamental to that upgrade. The Wiseco 102.40mm piston gives you a +2...09100338- SKU:
- 09100338
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- DISPLACEMENT:
- 675 CC
- PISTON MATERIAL:
- FORGED
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +2.40 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE - OVERSIZE:
- +2,40 MM
- BORE SIZE METRIC:
- 102.40 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$296.95 -
Wiseco 66mm 11.7:1 Piston Kit for 2007-2009 Honda CRF150R PK1427
WISECO
$306.95If you're pushing your CRF150R to its limits on the track, you need a piston kit engineered to handle the stress of high-RPM racing. Wiseco's forged construction and 11.7:1 compression ratio deliver...09030688- SKU:
- 09030688
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- BORE SIZE METRIC:
- 66.00 MM
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.7:1
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 43.70 MM
- PISTON DIAMETER METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
$306.95 -
Wiseco Piston Kit with Gaskets for 2005-2007 Honda CR125R PK1393
WISECO
$246.95Top-end wear is the silent killer of 2-stroke performance. The Wiseco PK1393 piston kit replaces worn cylinders and pistons with precision-forged components engineered to handle sustained high RPM...09030520- SKU:
- 09030520
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 53.94 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$246.95
