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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PROX Cam Chain - 98XRH2010 - 114 Links - Yamaha 31.2414
PROX
$74.95Cam Chain - 98XRH2010 - 114 Links - Yamaha Manufactured in Japan by Borg Warner, Designed to OEM specifications, Strong M-type chain that has a special heat treated pin plus advanced pin and link connection for maximum performance and durability09250825- SKU:
- 09250825
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$74.95 -
VERTEX Engine Rebuild Kit - Husqvarna | KTM WR00071
VERTEX
$1,225.95Engine Rebuild Kit - Husqvarna | KTM Convenient one-stop shop in a box; nearly all components required for a complete and professional rebuild, Vertex piston kit (standard compression piston, rings, pin and clips), Hot Rods heavy-duty crank (stock stroke...09031805- SKU:
- 09031805
- Availability:
- Ships Same Business Day
- Weight:
- 14.54 LBS
$1,225.95Qty in Cart: 0Quantity:Price:$1,225.95Subtotal: -
BOLT Oil Change Hardware Kit - Honda OILCHG-CRF.2
BOLT
$7.99Oil Change Hardware Kit - Honda Includes O-rings and drain plug washers07120671- SKU:
- 07120671
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
$7.99 -
Hot Cams Manual Cam Chain Tensioner for KTM 250 SX-F 2005-2023 HC00146
HOT CAMS
$46.95This high-performance cam chain tensioner is essential for maintaining optimal timing chain tension in your motorcycle. Designed to prevent chain rattling and jumping, it ensures your engine operates smoothly and efficiently. Upgrade your bike's...09251602- SKU:
- 09251602
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$46.95 -
VERTEX Top End Piston Kit - 66.35 mm - Gas Gas | Husqvarna | KTM VTK23630B-3
VERTEX
$307.95Top End Piston Kit - 66.35 mm - Gas Gas | Husqvarna | KTM The piston is heat treated with a T-5 hardening and tempering cycle, The piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life,...09106822- SKU:
- 09106822
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$307.95Qty in Cart: 0Quantity:Price:$307.95Subtotal: -
WOSSNER Piston Kit - 53.95 mm - Yamaha 8321DA
WOSSNER
$132.00Piston Kit - 53.95 mm - Yamaha Pistons made are with high quality, permanent skirt coating to reduce friction and piston rock for quiet and improved performance, Optimized machining for lightness, as well as maintained strength in key areas such as crown...09106837- SKU:
- 09106837
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
Wossner Piston Kit 94.95 mm Husqvarna FC450 2023-2024 4097DA
WOSSNER
$214.00Enhance your motorcycle's performance with our precision-engineered Piston Kit, designed specifically for Gas Gas, Husqvarna, and KTM models. Crafted from aerospace-grade aluminum alloy, this piston kit ensures optimal strength and lightweight...09106845- SKU:
- 09106845
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$214.00 -
VERTEX Top End Gasket Kit - Gas Gas/Husqvarna/KTM 810991
VERTEX
$101.25VERTEX Top End Gasket Kit - 810991 High-quality gasket kit designed for Gas Gas, Husqvarna, and KTM models. Precision-engineered for a perfect fit and reliable performance. Includes all necessary gaskets for a complete top-end rebuild. ...09348014- SKU:
- 09348014
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$101.25 -
BOYESEN Water Pump Kit - Magnesium - Gas Gas/Husqvarna/KTM WPK-42M
BOYESEN
$194.95Water Pump Kit - Magnesium - Gas Gas/Husqvarna/KTM Made in the USA09320309- SKU:
- 09320309
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$194.95Qty in Cart: 0Quantity:Price:$194.95Subtotal: -
ATHENA Piston Kit with Gaskets - 95.98 mm - KX450F P5F0960072007B
ATHENA
$263.07Piston Kit with Gaskets - 95.98 mm - KX450F Made of high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance, The smooth...09031751- SKU:
- 09031751
- Availability:
- Ships Same Business Day
- Weight:
- 1.53 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- TYPE:
- TOP END
- DISPLACEMENT:
- 450 CC
- MODEL:
- B
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 95.98 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
$263.07Qty in Cart: 0Quantity:Price:$263.07Subtotal: -
ATHENA Piston Kit with Gaskets - 87.95 mm - SXF350 P5F0880090001A
ATHENA
$257.02Piston Kit with Gaskets - 87.95 mm - SXF350 High-performance aluminum alloy construction for enhanced durability. Designed for 4-stroke Off-Road motorcycles, ensuring optimal performance. Precision-engineered using CNC machines for...09031760- SKU:
- 09031760
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 87.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 349 CC
- TYPE:
- TOP END
- MODEL:
- A
- PRODUCT NAME:
- PISTON KIT
$257.02Qty in Cart: 0Quantity:Price:$257.02Subtotal: -
ATHENA Piston Kit with Gaskets - 96.96 mm - YZ450F P5F0970197004B
ATHENA
$229.95Piston Kit with Gaskets - 96.96 mm - YZ450F Made of high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance, The smooth...09031769- SKU:
- 09031769
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 450 CC
- MODEL:
- B
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 96.96 MM
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
MOOSE RACING Piston Kit MX1026
MOOSE RACING
$0.00Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...9106488- SKU:
- 9106488
- Availability:
- Ships Same Business Day
- Weight:
- 18.40 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MPX2082
MOOSE RACING
$0.00Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...9106518- SKU:
- 9106518
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MPX2083A-P
MOOSE RACING
$0.00Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...9106519- SKU:
- 9106519
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MPX2059
MOOSE RACING
$0.00Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...9106487- SKU:
- 9106487
- Availability:
- Ships Same Business Day
- Weight:
- 17.60 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MP3031C
MOOSE RACING
$0.00Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...9106484- SKU:
- 9106484
- Availability:
- Ships Same Business Day
- Weight:
- 12.80 LBS
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
Rekluse Clutch Cover Honda CRF450R 2019-2024 RMS-0401002
REKLUSE
$0.00Engineered for the ultimate in durability and performance, the REKLUSE Clutch Cover RMS-0401002 is a must-have for any serious rider. Its robust design not only enhances your bike's aesthetics but also offers superior protection against the toughest...9402050- SKU:
- 9402050
- Availability:
- Ships Same Business Day
- Weight:
- 16.00 LBS
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
Rekluse Clutch Cover Honda CRF250R 2018-2022 RMS-0401101
REKLUSE
$0.00Elevate your riding experience with the REKLUSE Clutch Cover RMS-0401101, meticulously crafted for exceptional durability and performance. This stylish component is engineered to withstand the toughest terrains, ensuring you stay ready for any adventure...9402103- SKU:
- 9402103
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$0.00Qty in Cart: 0Quantity:Price:$0.00Subtotal: -
MOOSE RACING Piston Kit MP3035
MOOSE RACING
$125.95Piston Kit Moose Racing pistons feature X-style forgings and fully boxed-style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Pro Race Piston increases the durability by reducing the stresses...09106481- SKU:
- 09106481
- Availability:
- Ships Same Business Day
- Weight:
- 19.20 LBS
$125.95Qty in Cart: 0Quantity:Price:$125.95Subtotal:
