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 Oil Drain Plug - Yamaha 011-156
WSM
$7.57A compromised oil drain plug can lead to catastrophic engine damage—slow seepage, cross-threading, or complete oil loss during critical racing moments. The WSM Oil Drain Plug (011-156) is engineered as a direct replacement for Yamaha applications,...07120358- SKU:
- 07120358
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PLUG
- STYLE:
- 2-STROKE
- STYLE:
- YAMAHA
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL DRAIN
$7.57 -
WSM Oil Drain Plug - Sea-Doo 011-161
WSM
$10.26A worn or damaged oil drain plug can lead to catastrophic leaks, compromising your Sea-Doo's engine protection and leaving you stranded. The WSM Oil Drain Plug (011-161) is a genuine OEM replacement that ensures a secure seal and reliable oil changes...07120359- SKU:
- 07120359
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STYLE:
- SEA-DOO
- TYPE:
- OIL DRAIN
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
$10.26 -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-824-10P
WSM
$536.48A top-end rebuild is the foundation of reliable, high-output engine performance—and this kit delivers everything you need in one complete package. The WSM Platinum Series combines OEM-grade pistons with premium racing components, eliminating the...09030749- SKU:
- 09030749
- Availability:
- Ships Same Business Day
- Weight:
- 5.50 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM SERIES
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- STANDARD
$536.48Qty in Cart: 0Quantity:Price:$536.48Subtotal: -
On Sale
XCELDYNE Intake Valve Kit X2SIVM13001
XCELDYNE
MSRP: $44.49Now: $28.00Was: $44.49A quality intake valve kit is fundamental to unlocking your engine's full potential—restrictive or worn valves directly limit airflow and kill horsepower. The XCELDYNE X2SIVM13001 delivers the high-flow design and durability you need for sustained...09262206- SKU:
- 09262206
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- +1 MM HEAD DIAMETER
- BASE COLOR:
- SILVER
- MODEL:
- X2
- UNITS:
- EACH
- COLOR/FINISH:
- STEEL
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE
- APPLICATION:
- SINGLE INTAKE
- RIDING STYLE:
- ATV
- STYLE:
- HIGH-FLOW
MSRP: $44.49Now: $28.00Was: $44.49 -
XCELDYNE Intake Valve Kit X2SIVM42002
XCELDYNE
$40.04If you're serious about extracting maximum power from your engine, valve quality directly impacts combustion efficiency, flow rates, and reliability under high RPM conditions. The XCELDYNE X2SIVM42002 Intake Valve Kit delivers a complete, matched...09262216- SKU:
- 09262216
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- OUTER
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- HIGH-FLOW
- BASE COLOR:
- SILVER
- APPLICATION:
- SINGLE INTAKE
- UNITS:
- EACH
- COLOR/FINISH:
- STEEL
- MODEL:
- X2
- PRODUCT NAME:
- VALVE
$40.04 -
BLOWSION Base Gasket - .020" - Kawasaki 750/800 01-03-302
BLOWSION
$29.95A reliable base gasket is critical to maintaining crankcase integrity and preventing blowouts during high-rpm operation. The BLOWSION .020" base gasket eliminates messy gasket sealants and delivers a reusable, metal-core design that withstands repeated...09344575- SKU:
- 09344575
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- MODEL:
- SUPER
- THICKNESS:
- 0,51 MM (0,020')
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
BOLT Drain Plug Washer Kit DPW.KTM
BOLT
$4.99Proper drain plug sealing is critical to prevent oil leaks that can compromise engine health and create messy shop conditions. This comprehensive washer kit gives you the correct copper seal washers for KTM applications, eliminating guesswork during...09200154- SKU:
- 09200154
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- WASHER
- TYPE:
- DRAIN
- UNITS:
- 8 PACK
- RIDING STYLE:
- OFF-ROAD
$4.99 -
On Sale
ATHENA Cylinder Kit - YZ125 - 54mm P400485100003
ATHENA
MSRP: $1,110.95Now: $1,000.00Was: $1,110.95If you're pushing your YZ125 to its limits, a worn or damaged cylinder is the silent killer of your power band. The ATHENA Cylinder Kit delivers a complete, bolt-on refresh that restores—or exceeds—OEM performance without requiring machine work or...4.00485E+11- SKU:
- 4.00485E+11
- Availability:
- Ships Same Business Day
- Weight:
- 88.00 LBS
MSRP: $1,110.95Now: $1,000.00Was: $1,110.95 -
On Sale
ATHENA Cylinder Kit - YZ125 - 54mm P400485100008
ATHENA
MSRP: $971.95Now: $875.00Was: $971.95If you're running a YZ125 and want to unlock measurable gains in displacement and top-end power, the ATHENA Cylinder Kit delivers a straightforward bore upgrade without the hassle of machine work. The nickel-carbide coated aluminum cylinder paired with a...400485100008- SKU:
- 400485100008
- Availability:
- Ships Same Business Day
- Weight:
- 4.43 LBS
MSRP: $971.95Now: $875.00Was: $971.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600089
ATHENA
MSRP: $21.95Now: $20.00Was: $21.95A fresh top end gasket kit is essential maintenance between races or at midseason to ensure your engine maintains peak seal integrity and compression consistency. The ATHENA P400485600089 gives you the flexibility to run standard fuel with stock...400485600089- SKU:
- 400485600089
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $21.95Now: $20.00Was: $21.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600069
ATHENA
MSRP: $89.95Now: $81.00Was: $89.95When you're preparing for race day, engine reliability can't be left to chance. The ATHENA Top End Gasket Kit is engineered for riders who demand precision between rebuilds—whether you're freshening your top end mid-season or preparing for competition...09346466- SKU:
- 09346466
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $89.95Now: $81.00Was: $89.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900069
ATHENA
MSRP: $260.95Now: $235.00Was: $260.95A failed gasket can compromise your entire engine—leading to coolant leaks, oil seepage, and catastrophic performance loss. The ATHENA Complete Gasket Kit delivers the sealing integrity your Kawasaki P400 demands, engineered with multi-layer construction...09346467- SKU:
- 09346467
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $260.95Now: $235.00Was: $260.95 -
On Sale
ATHENA Race Gasket Kit - Kawasaki R2506-069
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95Whether you're prepping for race day or executing a mid-season engine refresh, the ATHENA Race Gasket Kit gives you the flexibility to optimize your engine's compression ratio without a complete rebuild. This kit includes a premium MLSS head gasket and...09346469- SKU:
- 09346469
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $54.95Now: $49.00Was: $54.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485900213
ATHENA
MSRP: $172.95Now: $156.00Was: $172.95Engine gasket failure compromises compression, causes coolant and oil leaks, and can lead to catastrophic internal damage if not addressed. The ATHENA Complete Gasket Kit provides OEM-equivalent sealing across your entire top-end assembly, ensuring...09346471- SKU:
- 09346471
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $172.95Now: $156.00Was: $172.95 -
On Sale
ATHENA Race Gasket Kit - Yamaha R4856-213
ATHENA
MSRP: $72.95Now: $66.00Was: $72.95Engine gasket degradation is one of the most common reasons for compression loss and mid-season performance drops. The ATHENA Race Gasket Kit R4856-213 gives you the precision components to refresh your top-end without a complete rebuild, letting you...09346472- SKU:
- 09346472
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ENGINE
- UNITS:
- KIT
MSRP: $72.95Now: $66.00Was: $72.95 -
On Sale
ATHENA Race Gasket Kit - Honda R2106-317
ATHENA
MSRP: $71.95Now: $65.00Was: $71.95High-revving engines demand gaskets that can handle sustained combustion pressures without failure—and the ATHENA Race Gasket Kit delivers exactly that. Built with rubber-coated spring steel and engineered for extreme thermal cycling, this kit maintains...09345462- SKU:
- 09345462
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $71.95Now: $65.00Was: $71.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600317
ATHENA
MSRP: $82.95Now: $75.00Was: $82.95A failing head gasket can compromise your entire engine's integrity, leading to coolant leaks, combustion blow-by, and catastrophic overheating. The ATHENA Top End Gasket Kit uses advanced rubber-coated spring steel construction to maintain a consistent,...09345463- SKU:
- 09345463
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $82.95Now: $75.00Was: $82.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600077
ATHENA
MSRP: $93.95Now: $85.00Was: $93.95Head gasket failure can sideline your engine and drain your wallet—the ATHENA Top End Gasket Kit is engineered to prevent catastrophic leaks and maintain compression integrity across extreme operating conditions. Built with rubber-coated spring steel and...09345465- SKU:
- 09345465
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $93.95Now: $85.00Was: $93.95 -
On Sale
ATHENA Complete Gasket Kit - Husqvarna P400270900077
ATHENA
MSRP: $231.95Now: $209.00Was: $231.95A complete gasket kit is your engine's first line of defense against compression loss, coolant leaks, and thermal stress. The ATHENA P400270900077 delivers OEM-equivalent sealing performance with materials engineered specifically for high-temperature...09345466- SKU:
- 09345466
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $231.95Now: $209.00Was: $231.95 -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400270600078
ATHENA
MSRP: $97.95Now: $88.00Was: $97.95A quality top-end gasket kit is essential for maintaining cylinder head integrity and preventing coolant or oil leakage under high-temperature operating conditions. The ATHENA P400270600078 combines durable spring steel construction with advanced sealing...09345471- SKU:
- 09345471
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $97.95Now: $88.00Was: $97.95
