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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- Qty in Cart
- Quantity
- Price
- Subtotal
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Wiseco Piston Kit 95.00 mm Yamaha YZ450F 2006-2009 4694M09500
WISECO
$269.95Elevate your riding experience with this precision-engineered forged piston kit, specifically crafted for Yamaha 4-stroke engines. Designed for optimal performance and durability, this kit ensures a perfect fit and enhanced power delivery for various...09102919- SKU:
- 09102919
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$269.95Qty in Cart: 0Quantity:Price:$269.95Subtotal: -
Wiseco Engine Rebuild Kit 66.40mm Bore Yamaha YZ250 2003-2020 PWR134-100
WISECO
$654.95Revitalize your Yamaha YZ250/X with our comprehensive engine rebuild kit, meticulously crafted to enhance performance and reliability. This all-inclusive package ensures that every component, from the crankshaft to the gaskets, meets the highest...09031519- SKU:
- 09031519
- Availability:
- Ships Same Business Day
- Weight:
- 13.30 LBS
$654.95 -
WORKS CONNECTION Radiator Drain Plug - Black - Honda/Kawasaki 24-632
WORKS CONNECTION
$23.95Radiator Drain Plug - Black - Honda/Kawasaki Direct replacement for the stock plastic plug, CNC machined from billet aluminum to exacting specifications, Laser engraved Works Connection logo on top, Made in the U.S.A09500984- SKU:
- 09500984
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
WORKS CONNECTION Radiator Drain Plug - Green - Honda/Kawasaki 24-633
WORKS CONNECTION
$23.95Radiator Drain Plug - Green - Honda/Kawasaki Direct replacement for the stock plastic plug, CNC machined from billet aluminum to exacting specifications, Laser engraved Works Connection logo on top, Made in the U.S.A09500985- SKU:
- 09500985
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
Wossner 90.00mm Piston Ring Set for 4-Stroke Engines 900XSY-3
WOSSNER
$38.95Upgrade your engine's performance with our high-quality Piston Ring Set designed specifically for Wossner 4-stroke pistons. With a precision fit and durable construction, this replacement ring set ensures optimal sealing and efficiency, enhancing your...09120683- SKU:
- 09120683
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$38.95Qty in Cart: 0Quantity:Price:$38.95Subtotal: -
KIBBLEWHITE Valve - Intake - Tensilite 40-41612T
KIBBLEWHITE
$92.51Valve - Intake - Tensilite? Extensive R&D on all applications to provide high-performance components that last longer than OEM, Black Diamond valves are one-piece forgings made from 21-4N high-performance stainless steel, Trademarked Black Diamond...09263389- SKU:
- 09263389
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
$92.51 -
MOOSE OFFROAD Carburetor Mid Body Gasket Kit - Honda 26-10157
MOOSE OFFROAD
$24.95Carburetor Mid Body Gasket Kit - Honda Kit includes all of the necessary components to reseal a FCR carburetor at its center section, Components not available from OEM, Kit includes replacement gaskets, O-rings, screws and specialty tool (if necessary)09351198- SKU:
- 09351198
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$24.95 -
MOOSE RACING Exhaust Valve M40-41660
MOOSE RACING
$196.95Exhaust Valve Extend the life of the valve train and intake components by as much as 4x over the OEM titanium parts, Stainless steel conversion kits include only what*s needed to convert your head to the long-life stainless steel Black Diamond intake...09263372- SKU:
- 09263372
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$196.95 -
MOOSE RACING Intake Valve M30-34000
MOOSE RACING
$196.95Intake Valve - M30-34000 Enhanced performance with superior flow characteristics compared to OEM valves. Engineered for longevity, ensuring a longer lifespan than standard components. Utilizes advanced Finite Element Analysis (F.E.A.) for...09263373- SKU:
- 09263373
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
$196.95Qty in Cart: 0Quantity:Price:$196.95Subtotal: -
Wossner Crankshaft Assembly for KTM 85 SX 2014-2017 Husqvarna TC85 2014-2017 CS2065-1
WOSSNER
$342.00Enhance the performance of your Husqvarna or KTM engine with our premium Crankshaft Assembly. This assembly includes a high-quality crankshaft, connecting rod, and top end bearing, ensuring reliable operation and longevity. Designed as a standard...09210914- SKU:
- 09210914
- Availability:
- Ships Same Business Day
- Weight:
- 4.48 LBS
$342.00Qty in Cart: 0Quantity:Price:$342.00Subtotal: -
Wossner Crankshaft Assembly Yamaha YZ85 2019-2025 CS2072
WOSSNER
$262.00Upgrade your Yamaha engine with our high-quality Crankshaft Assembly, designed for optimal performance and reliability. This complete assembly includes a precision-engineered crankshaft, connecting rod, and top end bearing, ensuring a seamless fit for...09210917- SKU:
- 09210917
- Availability:
- Ships Same Business Day
- Weight:
- 4.06 LBS
$262.00Qty in Cart: 0Quantity:Price:$262.00Subtotal: -
Wossner Crankshaft Assembly Yamaha YZ250F 2003-2013 CS4005
WOSSNER
$404.00Upgrade your Yamaha's performance with our premium Crankshaft Assembly, designed for optimal engine efficiency and durability. This assembly includes a high-quality crankshaft and connecting rod, along with a top-end bushing, ensuring a seamless fit and...09210919- SKU:
- 09210919
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$404.00Qty in Cart: 0Quantity:Price:$404.00Subtotal: -
VINTCO Connecting Rod Kit KR2003
VINTCO
$159.95Connecting Rod Kit Heavy duty forged connecting rods ensure as good or better than OEM fitment and performance, Improved ventilation slots for improved bearing lubrication, Kit includes connecting rod, crank pin, connecting rod bearing, wrist pin...09230635- SKU:
- 09230635
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$159.95 -
VINTCO Connecting Rod Kit KR2037
VINTCO
$159.95Connecting Rod Kit KR2037 Heavy-duty forged construction for superior strength and durability. Designed for optimal fitment and performance, matching or exceeding OEM standards. Enhanced ventilation slots promote better lubrication for...09230637- SKU:
- 09230637
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$159.95Qty in Cart: 0Quantity:Price:$159.95Subtotal: -
VINTCO Connecting Rod Kit KR2030
VINTCO
$169.95Connecting Rod Kit KR2030 Heavy-duty forged construction for enhanced durability OEM fitment and performance that meets or exceeds standards Improved ventilation slots for superior bearing lubrication Complete kit includes connecting...09230662- SKU:
- 09230662
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$169.95 -
VINTCO Connecting Rod Kit KR2056
VINTCO
$106.95Connecting Rod Kit Heavy duty forged connecting rods ensure as good or better than OEM fitment and performance, Improved ventilation slots for improved bearing lubrication, Kit includes connecting rod, crank pin, connecting rod bearing, wrist pin...09230665- SKU:
- 09230665
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
$106.95Qty in Cart: 0Quantity:Price:$106.95Subtotal: -
VINTCO Connecting Rod Kit KR2031
VINTCO
$179.95Connecting Rod Kit Heavy duty forged connecting rods ensure as good or better than OEM fitment and performance, Improved ventilation slots for improved bearing lubrication, Kit includes connecting rod, crank pin, connecting rod bearing, wrist pin...09230671- SKU:
- 09230671
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$179.95 -
VINTCO Main Bearing and Seal Kit - Honda KMB003
VINTCO
$34.95Main Bearing and Seal Kit - Honda Includes necessary bearings and seals to complete crankshaft installation, Includes premium OEM quality Japanese manufactured bearings09240651- SKU:
- 09240651
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
VINTCO Main Bearing and Seal Kit - Suzuki KMB018
VINTCO
$59.95Main Bearing and Seal Kit - Suzuki Includes necessary bearings and seals to complete crankshaft installation, Includes premium OEM quality Japanese manufactured bearings09240670- SKU:
- 09240670
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$59.95 -
VINTCO Main Bearing and Seal Kit - Suzuki KMB019
VINTCO
$59.95Main Bearing and Seal Kit - KMB019 Complete kit for crankshaft installation Includes all necessary bearings and seals Premium OEM quality for reliable performance Manufactured in Japan for superior craftsmanship Designed specifically...09240671- SKU:
- 09240671
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$59.95Qty in Cart: 0Quantity:Price:$59.95Subtotal:
