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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MOOSE RACING Motor Seals - KX250 822286
MOOSE RACING
$30.39Engine seals are critical—they prevent oil leakage, maintain compression, and protect your investment in a rebuild. MOOSE RACING Motor Seals deliver OEM-equivalent performance at a fraction of...09350050- SKU:
- 09350050
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- APPLICATION:
- ENGINE
- UNITS:
- SET
- PRODUCT NAME:
- SEAL
- TYPE:
- OIL
- RIDING STYLE:
- OFF-ROAD
$30.39Qty in Cart: 0Quantity:Price:$30.39Subtotal: -
MOOSE RACING Clutch Guard - Cylinder - Beta 13-4020
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to chain strikes and debris impact—damage that can sideline your bike mid-season. The MOOSE RACING Clutch Guard provides direct protection where it matters...09500921- SKU:
- 09500921
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- COLOR/FINISH:
- ANODIZED
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- RIDING STYLE:
- STREET
$42.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Yamaha 25-4024
MOOSE RACING
$22.95A worn countershaft sprocket seal allows oil leakage and accelerates wear on critical drivetrain components—a small oversight that compounds into expensive damage. This MOOSE RACING kit delivers...09350449- SKU:
- 09350449
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL KIT
$22.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4025
MOOSE RACING
$22.95Countershaft seals are critical to engine longevity—they prevent oil contamination and gear wear that can compromise your transmission. The MOOSE RACING 25-4025 kit replaces worn or damaged seals...09350450- SKU:
- 09350450
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
$22.95 -
MOOSE RACING Countershaft Sprocket Seal Kit - Suzuki 25-4027
MOOSE RACING
$23.95A worn countershaft sprocket seal compromises engine performance and invites contamination into critical drivetrain components. This MOOSE RACING kit delivers OEM-quality sealing with...09350452- SKU:
- 09350452
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- COUNTERSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
$23.95 -
MOOSE RACING Ring Set - For 96 mm Piston CPN2-2-3779
MOOSE RACING
$35.95A quality ring set is fundamental to engine longevity and performance—it seals combustion pressure, regulates oil consumption, and directly impacts horsepower delivery. The MOOSE RACING Ring Set for...09120754- SKU:
- 09120754
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PISTON SIZE METRIC:
- STANDARD
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$35.95Qty in Cart: 0Quantity:Price:$35.95Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - XR400 808265
MOOSE RACING
$87.31A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your XR400's reliability. This kit eliminates the guesswork of sourcing individual components,...M808265- SKU:
- M808265
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$87.31Qty in Cart: 0Quantity:Price:$87.31Subtotal: -
On Sale
VESRAH Complete Gasket Kit - XL 250 VG-142
VESRAH
MSRP: $58.95Now: $56.00Was: $58.95A complete gasket kit is non-negotiable for any engine rebuild—mismatched or worn seals will compromise compression, leak oil, and undermine all your other restoration work. The VESRAH VG-142...VG142- SKU:
- VG142
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- COMPLETE
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $58.95Now: $56.00Was: $58.95 -
On Sale
VESRAH Complete Gasket Kit - PW80 VG-2022
VESRAH
MSRP: $22.95Now: $21.80Was: $22.95A complete engine rebuild demands precision and reliability at every seal and gasket interface. The VESRAH Complete Gasket Kit ensures your PW80 engine achieves proper compression, prevents fluid...VG2022- SKU:
- VG2022
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
MSRP: $22.95Now: $21.80Was: $22.95Qty in Cart: 0Quantity:Price:MSRP: $22.95Now: $21.80Was: $22.95Subtotal: -
On Sale
VESRAH Complete Gasket Kit - DT/GT/MX80 VG-248
VESRAH
MSRP: $23.06Now: $21.91Was: $23.06A complete engine rebuild demands precision sealing at every critical junction—and that's exactly what the VESRAH VG-248 delivers. This comprehensive gasket kit eliminates the risk of sourcing...VG248- SKU:
- VG248
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- SET
MSRP: $23.06Now: $21.91Was: $23.06Qty in Cart: 0Quantity:Price:MSRP: $23.06Now: $21.91Was: $23.06Subtotal: -
MOOSE RACING Carb Mid Body Gasket Kit 26-1512
MOOSE RACING
$30.95FCR carburetors demand precision sealing to maintain fuel atomization and consistent jetting across your powerband. Over time, factory gaskets and O-rings degrade, leading to fuel seepage, tuning...09351011- SKU:
- 09351011
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- CARBURETOR
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
$30.95 -
MOOSE RACING Carb Mid Body Gasket Kit 26-1511
MOOSE RACING
$26.95Carburetor mid-body gasket failure leads to fuel leaks, inconsistent jetting, and unpredictable performance on the track or trail. The MOOSE RACING Carb Mid Body Gasket Kit 26-1511 provides all...09351012- SKU:
- 09351012
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- CARBURETOR
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$26.95 -
MOOSE RACING Water Pump Rebuild Kit 821407
MOOSE RACING
$45.89A failing water pump can quickly become a catastrophic engine failure, leaving you stranded and facing costly repairs. This MOOSE RACING rebuild kit gives you everything needed to restore your water...09345213- SKU:
- 09345213
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$45.89 -
MOOSE RACING Piston Kit - 71.95 mm MSE23375B
MOOSE RACING
$141.95Engine wear accelerates under sustained performance demands, and OEM pistons often fail to meet the durability requirements of serious racers and high-mileage builds. The MOOSE RACING Piston Kit...09102714- SKU:
- 09102714
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
$141.95Qty in Cart: 0Quantity:Price:$141.95Subtotal: -
MOOSE RACING Wrist Pin W748-200015CP1C
MOOSE RACING
$30.95Wrist pins are critical load-bearing components in your engine's connecting rod assembly, and inferior pins lead to premature wear, rod knock, and catastrophic failure. The MOOSE RACING...09130063- SKU:
- 09130063
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- STYLE:
- 4-STROKE
- UNITS:
- EACH
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
MOOSE RACING Clutch Cylinder Guard - KTM 13-097
MOOSE RACING
$42.95Hydraulic clutch cylinders are vulnerable to impact and chain sling during aggressive riding, and a compromised cylinder means catastrophic failure at the worst possible moment. The MOOSE RACING...09500194- SKU:
- 09500194
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CASE SAVER
- TYPE:
- SLAVE CYLINDER
- COLOR/FINISH:
- ANODIZED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$42.95Qty in Cart: 0Quantity:Price:$42.95Subtotal: -
On Sale
VESRAH Top End Gasket Kit - XL/R 75/80 VG-5034
VESRAH
MSRP: $45.05Now: $42.80Was: $45.05A worn or degraded gasket set compromises engine sealing, leading to oil leaks, coolant loss, and performance degradation. The VESRAH VG-5034 Top End Gasket Kit provides OEM-grade sealing components...VG5034- SKU:
- VG5034
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $45.05Now: $42.80Was: $45.05Qty in Cart: 0Quantity:Price:MSRP: $45.05Now: $42.80Was: $45.05Subtotal: -
On Sale
VESRAH Top End Gasket Kit - XL/XR 600R VG-5081-M
VESRAH
MSRP: $149.73Now: $142.24Was: $149.73A top-end engine rebuild demands precision sealing—any gap or failed gasket will compromise compression, leak oil, and tank performance. The VESRAH VG-5081-M delivers a complete gasket solution...VG5081- SKU:
- VG5081
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
MSRP: $149.73Now: $142.24Was: $149.73Qty in Cart: 0Quantity:Price:MSRP: $149.73Now: $142.24Was: $149.73Subtotal: -
WSM Piston Kit - Kawasaki 900 - Standard 010-840K
WSM
$76.57A piston kit is one of the most critical internal components you'll upgrade in a high-performance build—it directly impacts compression ratio, heat dissipation, and ring sealing consistency. The WSM...010840- SKU:
- 010840
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 73.00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$76.57Qty in Cart: 0Quantity:Price:$76.57Subtotal: -
WSM Piston Rings 010-917-05
WSM
$41.33Piston rings are critical wear items that directly impact engine compression, blow-by control, and oil consumption—replacing them during a rebuild or high-mileage service is essential to restoring...01091705- SKU:
- 01091705
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
$41.33Qty in Cart: 0Quantity:Price:$41.33Subtotal:
