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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On Sale
Wiseco Engine Rebuild Kit 2002-2006 KTM 125 SX PWR153-101
WISECO
MSRP: $664.95Now: $565.00Was: $664.95Revitalize your engine with the WISECO Engine Rebuild Kit PWR153-101, designed for both performance and longevity. This comprehensive kit includes everything you need for a complete engine overhaul, ensuring your machine runs like new. With premium...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
MSRP: $664.95Now: $565.00Was: $664.95 -
On Sale
Wiseco Engine Rebuild Kit for 2004-2012 KTM 85 SX PWR162-100
WISECO
MSRP: $469.95Now: $399.00Was: $469.95Revitalize your 85SX with the WISECO Engine Kit, engineered for peak performance and reliability. This comprehensive kit includes everything you need for a complete engine rebuild, ensuring your bike runs smoothly and efficiently. With precision-crafted...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
MSRP: $469.95Now: $399.00Was: $469.95 -
On Sale
Wiseco 56mm Piston Kit with Gaskets for KTM 125 SX 2002-2006 PK1513
WISECO
MSRP: $234.95Now: $200.00Was: $234.95Wiseco PK1513 Piston Kit Transform your 2-stroke motorcycle engine with the Wiseco PK1513 Piston Kit, engineered for optimal performance and reliability. This premium kit is perfect for riders who demand excellence, ensuring your bike is ready to conquer...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®
MSRP: $234.95Now: $200.00Was: $234.95Qty in Cart: 0Quantity:Price:MSRP: $234.95Now: $200.00Was: $234.95Subtotal: -
Pro Filter Replacement Oil Filter Ducati 1098 2007-2008 PF-153
PRO FILTER
$11.99Upgrade your engine's performance with the PRO FILTER Replacement Oil Filter PF-153. Designed to meet and exceed OEM specifications, this high-performance filter ensures optimal filtration and flow rates, providing superior protection for your engine...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
$6.99Experience superior engine protection with the PRO FILTER Replacement Oil Filter PF-140. Engineered to meet and exceed OEM specifications, this high-performance filter ensures optimal filtration for both synthetic and petroleum-based oils. Its advanced...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
$6.99Enhance your engine's performance with the PRO FILTER Replacement Oil Filter PF-113, designed for optimal filtration and durability. This high-quality OEM-type filter ensures consistent flow rates and exceptional strength, making it suitable for both...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
$14.36Top-quality billet aluminum construction, Washers not included011206- 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
$7.09Pro Series filters literally use the world's finest materials: German paper, English glue and Japanese zinc steel that meet or exceed OEM requirements, All necessary gaskets and o-rings are included with most filters010015- 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: -
MOOSE RACING Oil Seal Set - DRZ200 822226
MOOSE RACING
$37.21Includes every seal in a engine including crank shaft seals, Does not include valve stem seal, Made in the USA09351149- SKU:
- 09351149
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- TYPE:
- OIL
$37.21Qty in Cart: 0Quantity:Price:$37.21Subtotal: -
Pro Filter Suzuki DR250 1982-1993 Oil Filter PF-136
PRO FILTER
$6.99Experience superior engine protection with the PRO FILTER Replacement Oil Filter PF-136. Engineered to meet and exceed OEM standards, this high-performance filter utilizes advanced micro-pore technology to ensure optimal filtration and consistent flow...07120572- SKU:
- 07120572
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- STYLE:
- PREMIUM
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE FINISH:
- CHROME
$6.99 -
Pro Filter 2004-2007 Arctic Cat 400 4x4 Auto LE Oil Filter PF-138B
PRO FILTER
$12.99Experience superior engine protection with the PRO FILTER Replacement Oil Filter PF-138B. Designed to meet and exceed OEM specifications, this high-performance filter utilizes advanced micro-pore filtration technology to ensure optimal oil flow and...07120574- SKU:
- 07120574
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BASE COLOR:
- BLACK
- RIDING STYLE:
- UTV
- STYLE:
- PREMIUM
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$12.99 -
On Sale
HOT RODS Crankshaft 4093
HOT RODS
MSRP: $465.95Now: $419.36Was: $465.95Sold complete with the original proven Hot Rods connecting rods, top-end bearings and crankshaft webs, Factory assembled and trued to OEM specifications; meet or surpass OEM in performance and durability, Complete and ready for installation, Completely...09210213- SKU:
- 09210213
- Availability:
- Ships Same Business Day
- Weight:
- 9.94 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MODEL:
- 4-CYCLE
- DISPLACEMENT:
- 450 CC
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- ASSEMBLY
MSRP: $465.95Now: $419.36Was: $465.95Qty in Cart: 0Quantity:Price:MSRP: $465.95Now: $419.36Was: $465.95Subtotal: -
On Sale
COMETIC Bottom End Gasket Set - Honda C3322
COMETIC
MSRP: $38.95Now: $37.00Was: $38.95Bottom end gasket kits include correct oil seals, O-rings, drain plug washers and water pump cover gaskets as needed, Materials will vary depending on what is correct and engineered for specified application, Purchase a top and a bottom end gasket kit...09344143- SKU:
- 09344143
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 71.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
MSRP: $38.95Now: $37.00Was: $38.95 -
Hot Cams Exhaust Camshaft for Kawasaki KX 250 F 2011-2016 2221-2E
HOT CAMS
$321.95Elevate your engine's performance with the HOT CAMS Exhaust Camshaft 2221-2E, designed specifically for high-performance racing applications. This camshaft optimizes both torque and horsepower, ensuring your engine delivers exceptional power across the...09250664- SKU:
- 09250664
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 245°
- UNITS:
- EACH
- EXHAUST LIFT METRIC:
- 9.65 MM
- TYPE:
- STAGE 2
$321.95 -
Hot Cams Stage 3 Camshaft for 2009 Honda CRF450R 1125-3
HOT CAMS
$220.95Elevate your racing performance with the HOT CAMS Camshaft 1125-3, engineered for enthusiasts seeking unparalleled power and responsiveness. Designed as a drop-in solution, these camshafts enhance both torque and horsepower, making them ideal for stock...09250461- SKU:
- 09250461
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INTAKE LIFT METRIC:
- 10.40 MM
- APPLICATION:
- EXHAUST
- EXHAUST LIFT METRIC:
- 9.00 MM
- INTAKE DURATION IMPERIAL:
- 252°
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 3
- EXHAUST DURATION IMPERIAL:
- 265°
$220.95Qty in Cart: 0Quantity:Price:$220.95Subtotal: -
Hot Cams Valve Shim 9.48 x 2.60 for Honda CRF450R 2002-2012 5PK948260
HOT CAMS
$10.95Enhance the performance of your engine with the HOT CAMS Valve Shim 9.48 x 2.60. This 5-pack of high-quality valve shims is designed to refill your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency. Durable and reliable, these shims...09261400- SKU:
- 09261400
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.60 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.90mm for 2006-2014 Yamaha YZ450F 5PK948290
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim 9.48 x 2.90. This convenient 5-pack is designed to refill your Valve Shim Kits, ensuring you have the right components for precise valve adjustments. Crafted for durability and reliability,...09261406- SKU:
- 09261406
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- UTV
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.90 MM
$10.95 -
Hot Cams Valve Shim 9.48mm x 2.95mm for Honda CRF450R 2002-2014 5PK948295
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim 9.48 x 2.95, designed for precision and durability. This five-pack of replacement shims is essential for maintaining optimal valve clearance in your engine, ensuring smooth operation and...09261407- SKU:
- 09261407
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- VALVE SHIM THICKNESS METRIC:
- 2.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$10.95 -
On Sale
PROX Piston Kit 01.1408.200
PROX
MSRP: $185.95Now: $158.00Was: $185.95Manufactured in Japan and designed to be OEM replacement, Cast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close tolerances, Pistons supplied in a kit package that includes rings,...09030821- SKU:
- 09030821
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 91.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
MSRP: $185.95Now: $158.00Was: $185.95Qty in Cart: 0Quantity:Price:MSRP: $185.95Now: $158.00Was: $185.95Subtotal: -
On Sale
VERTEX Piston Kit - Standard 22877B
VERTEX
MSRP: $127.95Now: $115.16Was: $127.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09100941- SKU:
- 09100941
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
MSRP: $127.95Now: $115.16Was: $127.95Qty in Cart: 0Quantity:Price:MSRP: $127.95Now: $115.16Was: $127.95Subtotal:
