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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WSM Piston Kit - Yamaha - Standard 010-826K
WSM
$89.33If you're rebuilding a Yamaha engine or replacing worn pistons, the WSM Piston Kit delivers OEM-equivalent quality with performance-focused engineering. The MOS2-coated skirts reduce friction and...010826- SKU:
- 010826
- Availability:
- Ships Same Business Day
- Weight:
- 1.19 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
$89.33 -
WSM Piston Kit - Yamaha - +.25 mm 010-826-04K
WSM
$89.33Stock pistons can't handle the demands of high-performance builds—thermal stress, detonation, and friction all contribute to premature failure and power loss. The WSM Piston Kit delivers OEM-grade...01082604- SKU:
- 01082604
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +0,25 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.25 MM
- BORE SIZE METRIC:
- 84.00 MM
- PRODUCT NAME:
- PISTON KIT
$89.33Qty in Cart: 0Quantity:Price:$89.33Subtotal: -
WSM Piston Kit - Yamaha - +.5 mm 010-826-05K
WSM
$89.33A properly matched piston kit is critical for reliable high-RPM performance and cylinder longevity. WSM's +.5mm oversized pistons deliver OEM-quality construction with performance-focused...01082605- SKU:
- 01082605
- Availability:
- Ships Same Business Day
- Weight:
- 1.19 LBS
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$89.33Qty in Cart: 0Quantity:Price:$89.33Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-826-10
WSM
$250.31A top-end rebuild demands precision components that restore your engine to factory specifications—or beyond. The WSM Top-End Rebuild Kit supplies everything needed for a complete piston and gasket...01082610- SKU:
- 01082610
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 84.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
$250.31Qty in Cart: 0Quantity:Price:$250.31Subtotal: -
MOOSE RACING Ignition Cover Gasket 816692
MOOSE RACING
$11.64A worn or compromised ignition cover gasket compromises engine sealing and can lead to oil seepage, contamination, and potential ignition system failure. The MOOSE Racing Ignition Cover Gasket 816692...09346162- SKU:
- 09346162
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$11.64 -
MOOSE RACING Ignition Cover Gasket 816721
MOOSE RACING
$8.83A quality ignition cover gasket is critical to preventing oil seepage and maintaining proper engine sealing—especially in high-performance applications where heat and vibration accelerate gasket...09346163- SKU:
- 09346163
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$8.83Qty in Cart: 0Quantity:Price:$8.83Subtotal: -
MOOSE RACING Ignition Cover Gasket 816725
MOOSE RACING
$7.52A compromised ignition cover gasket leads to oil seepage, potential engine contamination, and costly damage to your ignition system. The MOOSE RACING Ignition Cover Gasket 816725 delivers a precision...09346164- SKU:
- 09346164
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$7.52Qty in Cart: 0Quantity:Price:$7.52Subtotal: -
MOOSE RACING Ignition Cover Gasket 816736
MOOSE RACING
$8.29A compromised ignition cover gasket can lead to oil seepage, contamination of ignition components, and potential electrical failures—exactly what you don't want mid-race or mid-season. The MOOSE...09346165- SKU:
- 09346165
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- IGNITION COVER
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$8.29 -
MOOSE RACING Inner Clutch Cover Gasket 816750
MOOSE RACING
$20.35A leaking clutch cover gasket compromises engine sealing and can lead to oil contamination and performance loss. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent sealing reliability...09346166- SKU:
- 09346166
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$20.35Qty in Cart: 0Quantity:Price:$20.35Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - KTM/Husqvarna 8080036
MOOSE RACING
$131.46A complete engine and transmission rebuild demands gasket and seal integrity—any leak or failure compromises performance and reliability. The MOOSE RACING Complete Motor Gasket Kit delivers...09346441- SKU:
- 09346441
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$131.46Qty in Cart: 0Quantity:Price:$131.46Subtotal: -
MOOSE RACING Top End Gasket Kit 8100009
MOOSE RACING
$70.36A top-end rebuild demands precision and reliability—this gasket kit delivers both without the OEM price tag. Engineered with high-tech materials and manufactured to exact tolerances, you get the...09346442- SKU:
- 09346442
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$70.36 -
MOOSE RACING Top End Gasket Kit - Yamaha 8100022
MOOSE RACING
$29.19A top-end gasket kit is essential when rebuilding your engine or replacing pistons—it ensures proper sealing at every critical junction and prevents oil leaks, combustion bypass, and premature wear...09346443- SKU:
- 09346443
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$29.19 -
MOOSE RACING Top End Gasket Kit - Kawasaki 8100023
MOOSE RACING
$87.56A top-end rebuild demands precision-matched components that won't compromise reliability or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a fraction of...09346444- SKU:
- 09346444
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$87.56 -
MOOSE RACING Top End Gasket Kit - KTM 8100024
MOOSE RACING
$43.01A top-end rebuild demands precision-matched components that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and gaskets at a fraction...09346445- SKU:
- 09346445
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$43.01 -
MOOSE RACING Top End Gasket Kit - RM-Z 250 810567
MOOSE RACING
$75.98A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent performance at a fraction of...09342207- SKU:
- 09342207
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$75.98Qty in Cart: 0Quantity:Price:$75.98Subtotal: -
MOOSE RACING Top End Gasket Kit - YZ450F 810689
MOOSE RACING
$71.71A top-end rebuild demands precision-matched components—mismatched or worn gaskets will compromise compression, cause oil leakage, and accelerate wear on fresh internals. The MOOSE RACING Top End...09342208- SKU:
- 09342208
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$71.71 -
MOOSE RACING Complete Motor Gasket Kit - KDX220 808445
MOOSE RACING
$70.11A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your KDX220's reliability. This Moose Racing kit eliminates the hassle of sourcing individual...M808445- SKU:
- M808445
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- TYPE:
- ENGINE
$70.11 -
MOOSE RACING Top End Gasket Kit - CR125R 810244
MOOSE RACING
$49.60A complete top-end rebuild demands precision-matched gaskets and seals—anything less risks compression loss, oil leakage, and engine failure. The MOOSE RACING Top End Gasket Kit delivers OEM-quality...09340454- SKU:
- 09340454
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$49.60 -
MOOSE RACING Motor Gasket Kit with Seal - CR125R 811244
MOOSE RACING
$120.99A complete engine and transmission rebuild demands precision-engineered gaskets and seals that won't compromise your work or your wallet. MOOSE Racing delivers OEM-equivalent quality at a fraction of...09340456- SKU:
- 09340456
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$120.99 -
MOOSE RACING Top End Gasket Kit - SX/EXC/XL 810324
MOOSE RACING
$27.97A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. MOOSE RACING delivers OEM-equivalent performance at a fraction of OEM pricing, with...09340474- SKU:
- 09340474
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$27.97
