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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Wossner Dual Ring Piston Kit KTM 125 SX 2007-2025 54.01mm 8174DB
WOSSNER
$122.00When running a 2-stroke at the edge of performance, your piston is ground zero for power delivery and engine longevity. The Wossner 8174DB delivers the precision engineering and material science required to handle sustained high-RPM loads without...09104870- SKU:
- 09104870
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.01 MM
- DISPLACEMENT:
- 125 CC
- TYPE:
- DUAL RING
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
$122.00 -
Wossner Piston Kit 71.95mm for KTM 300 XC 2008-2011 8250DB
WOSSNER
$192.00When you're pushing a KTM 300 XC to its limits, a worn or stock piston becomes your bottleneck. The Wossner 8250DB is engineered to handle sustained high-load conditions while delivering the reliability and efficiency you need for consistent track...09104896- SKU:
- 09104896
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.95 MM
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 72.01 MM
- DISPLACEMENT:
- 293 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$192.00Qty in Cart: 0Quantity:Price:$192.00Subtotal: -
Wossner Piston Kit 77.97mm Honda CRF250R 2004-2005 CRF250X 2004-2017 8587DC
WOSSNER
$184.00When your CRF250R or CRF250X is pushing peak RPMs, a stock piston simply won't cut it. The Wössner 8587DC delivers the strength and precision engineering you need to handle aggressive riding conditions while maintaining reliability run after run. This...09104940- SKU:
- 09104940
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 77.97 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 78.02 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
$184.00 -
Wossner 94.95mm Piston Kit for 2008-2011 KTM 450 EXC-R 8707DA
WOSSNER
$204.00The Wossner 94.95mm Piston Kit delivers the reliability and precision your 2008-2011 KTM 450 EXC-R demands when pushing hard on the track or trail. Built from forged 4032 T6 aluminum and engineered with Finite Element Analysis, this kit minimizes...09104969- SKU:
- 09104969
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.95 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 11.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Piston Kit 94.96mm 11.9:1 Husaberg FE450 2009-2012 8707DB
WOSSNER
$204.00The Wossner Piston Kit 8707DB delivers the precision engineering and durability your Husaberg FE450 demands, whether you're pushing hard on the track or tackling aggressive trail conditions. Built from 4032 T6 forged aluminum and engineered with FEA...09104970- SKU:
- 09104970
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 95.01 MM
- PISTON SIZE METRIC:
- 94.96 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 11.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$204.00 -
Wossner Yamaha YZ250F 2008-2013 Piston Kit 8712DA
WOSSNER
$184.00Stock pistons in high-mileage YZ250F engines lose compression and responsiveness, directly impacting your throttle response and top-end power. The Wossner 8712DA delivers the reliability and precision engineering you need to restore—or exceed—factory...09104972- SKU:
- 09104972
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 77.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 76.96 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for KTM 50 SX 2013-2016 WR101-159
WRENCH RABBIT
$683.95When your KTM 50 SX's engine shows signs of wear—loss of compression, bearing play, or just plain tired performance—a complete rebuild is the most cost-effective path back to reliability. The Wrench Rabbit WR101-159 kit eliminates the guesswork by...09031260- SKU:
- 09031260
- Availability:
- Ships Same Business Day
- Weight:
- 5.80 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
$683.95 -
WSM Oil Filter Cap - Sea-Doo GTX 006-562
WSM
$28.18A properly sealed oil filter cap is critical to maintaining system pressure and preventing contamination in your Sea-Doo GTX. This OEM-specification cap ensures a consistent, leak-free seal during operation, protecting your engine's lubrication system...07120294- SKU:
- 07120294
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- BASE COLOR:
- BLACK
- TYPE:
- OIL FILTER
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- WATERCRAFT
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
$28.18 -
WSM Oil Drain Plug - Sea-Doo/Yamaha 011-158
WSM
$3.10A quality oil drain plug is critical to maintaining your engine's health and preventing costly leaks that compromise performance. The WSM Oil Drain Plug is engineered as a direct replacement for Sea-Doo and Yamaha jet ski engines, ensuring a proper seal...07120295- SKU:
- 07120295
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- PLUG
- BASE COLOR:
- BLACK
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- WATERCRAFT
- STYLE:
- YAMAHA
- STYLE:
- SEA-DOO
- TYPE:
- OIL DRAIN
$3.10 -
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
$7.57Qty in Cart: 0Quantity:Price:$7.57Subtotal: -
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: -
XCELDYNE Intake Valve Kit X2SIVM13001
XCELDYNE
$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
$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
