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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VESRAH Complete Gasket Kit - Z50 R VG-1006
VESRAH
$47.95A complete engine rebuild demands precision sealing at every junction—and this VESRAH gasket kit eliminates the guesswork by including every gasket, o-ring, and valve guide oil seal you need for a full top-to-bottom refresh. Whether you're rebuilding...VG1006- SKU:
- VG1006
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
$47.95 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-825-14
WSM
$250.31A top-end rebuild is critical maintenance for high-performance engines operating at sustained RPMs and boost levels—this kit delivers OEM-quality components engineered to restore compression, reduce blow-by, and extend engine life. The WSM Original...01082514- SKU:
- 01082514
- Availability:
- Ships Same Business Day
- Weight:
- 3.35 LBS
- BORE SIZE METRIC:
- 82.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- MODEL:
- ORIGINAL SERIES
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
$250.31 -
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 heat while actively drawing thermal energy away from the...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 construction with critical performance upgrades,...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 engineering—the MOS2 coating on the skirts actively reduces...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
$89.33 -
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 renewal, eliminating the guesswork and sourcing multiple...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 restores a reliable seal, protecting your ignition...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 degradation. The MOOSE Racing 816721 delivers reliable...09346163- SKU:
- 09346163
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$8.83 -
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 seal that keeps contaminants out and maintains optimal...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 RACING Ignition Cover Gasket 816736 delivers OEM-quality...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
$8.29Qty in Cart: 0Quantity:Price:$8.29Subtotal: -
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 at a fraction of OEM cost, using high-tech materials...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 OEM-equivalent fitment and material quality at a fraction of OEM...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 durability of genuine seals with the cost-effectiveness of...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. MOOSE Racing delivers OEM-equivalent reliability at a...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 the OEM price, giving you confidence that every critical...09346444- SKU:
- 09346444
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
$87.56Qty in Cart: 0Quantity:Price:$87.56Subtotal: -
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 of manufacturer pricing, eliminating the risk of cheap...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 the cost, with U.S.-manufactured components engineered...09342207- SKU:
- 09342207
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$75.98 -
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 Gasket Kit eliminates guesswork by supplying every OEM-spec...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 components and delivers OEM-quality seals at a fraction...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 seals at a fraction of factory pricing, so you can...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
