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
-
On Sale
Wiseco Piston Kit 1.50mm Oversize Yamaha IT400 1977-1978 394M08650
WISECO
MSRP: $224.95Now: $191.00Was: $224.95Worn or damaged pistons compromise engine efficiency and reliability—especially in a high-revving two-stroke like the IT400. The Wiseco 394M08650 delivers OEM-quality performance with a 1.50mm oversize that restores compression and power while...394M08650- SKU:
- 394M08650
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 397 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 86.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 86.42 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 70.00 MM
- BORE - OVERSIZE:
- +1,50 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $224.95Now: $191.00Was: $224.95 -
On Sale
Wiseco Piston Kit 96mm 13:1 Compression for Suzuki RM-Z450 2013-2023 40110M09600
WISECO
MSRP: $269.95Now: $229.00Was: $269.95High-compression pistons are critical for maximizing power output and engine longevity in demanding racing applications. The Wiseco 96mm 13:1 compression kit delivers precision-engineered construction that handles aggressive tuning, detonation...09103928- SKU:
- 09103928
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- DISPLACEMENT:
- 449 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
- STROKE LENGTH METRIC:
- 62.10 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
MSRP: $269.95Now: $229.00Was: $269.95 -
On Sale
Wiseco Honda XR650R 2000-2007 100mm 10:1 Piston Kit 4715M10000
WISECO
MSRP: $239.95Now: $204.00Was: $239.95If you're running an XR650R and demanding more from your engine, a properly spec'd piston kit is non-negotiable. The Wiseco 4715M10000 delivers the compression ratio and material science your build needs to stay reliable under sustained high-RPM...4715M10000- SKU:
- 4715M10000
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 100.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 82.60 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 644 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PISTON DIAMETER METRIC:
- 99.95 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
MSRP: $239.95Now: $204.00Was: $239.95 -
On Sale
Wiseco Piston Kit Kawasaki KX450F 2015 96.03mm 12.8:1 40125M09603
WISECO
MSRP: $239.95Now: $204.00Was: $239.95When you're pushing your KX450F to its limits, your piston needs to handle extreme combustion pressures and sustained RPMs without breaking down. This Wiseco piston kit delivers the precision engineering and durability required for competitive riding and...09103942- SKU:
- 09103942
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 62.30 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 451 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 96.00 MM
MSRP: $239.95Now: $204.00Was: $239.95 -
On Sale
Wossner Piston Kit 53.97mm Kawasaki KX125 2003 8073DC
WOSSNER
MSRP: $117.95Now: $78.00Was: $117.95When you're pushing a 2-stroke engine to its limits, piston reliability becomes non-negotiable. The Wossner 8073DC delivers the durability and thermal stability needed to handle sustained high-RPM abuse, while its friction-reducing skirt coating...09105505- SKU:
- 09105505
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 54.02 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 53.97 MM
MSRP: $117.95Now: $78.00Was: $117.95 -
Wossner Piston Kit Honda CR250R 1986-1996 66.94mm 8021D060
WOSSNER
$152.00If you're running a Honda CR250R and want to restore peak performance or build beyond stock specs, a quality piston kit is non-negotiable. The Wossner 8021D060 delivers the durability and precision you need to handle sustained high RPMs and demanding...09104726- SKU:
- 09104726
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.94 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.60 MM
- DISPLACEMENT:
- 249 CC
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 67.00 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,60 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$152.00Qty in Cart: 0Quantity:Price:$152.00Subtotal: -
Wossner Piston Kit 66.94mm for Suzuki RM250 1989-1995 RMX250 1989-1998 8022DA
WOSSNER
$152.00Two-stroke engines demand precision components that can handle extreme temperatures and combustion pressures without compromise. The Wossner 8022DA piston kit delivers the durability and efficiency your Suzuki RM250 or RMX250 needs to maintain peak...09104731- SKU:
- 09104731
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 66.94 MM
- PRODUCT NAME:
- PISTON KIT
$152.00 -
Wossner Piston Kit 53.97mm Suzuki RM125 2000-2003 8061DC
WOSSNER
$122.00The Wossner Piston Kit 8061DC is engineered for 2-stroke racers who demand reliability and peak performance from their RM125. This complete kit—piston, rings, pin, and clips—eliminates guesswork and delivers the precision fit needed for consistent power...09104772- SKU:
- 09104772
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,02 MM
- BORE SIZE METRIC:
- 54.02 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 53.97 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
Wossner Honda CR125R 2000-2003 Piston Kit 8067DB
WOSSNER
$142.00When you're pushing a CR125R to its limits, your piston kit needs to handle extreme combustion pressures and sustained RPMs without compromise. The Wossner 8067DB delivers German-engineered reliability with a forged aluminum construction that resists...09104779- SKU:
- 09104779
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,01 MM
- DISPLACEMENT:
- 125 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 54.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
$142.00Qty in Cart: 0Quantity:Price:$142.00Subtotal: -
Wossner Piston Kit 53.95mm Honda CR125R 2005-2007 8170DA
WOSSNER
$122.00When you're pushing a CR125R to its limits, your piston needs to handle extreme combustion pressures and sustained RPMs without compromising reliability. The Wossner 8170DA is a complete replacement kit engineered to restore or exceed OEM performance...09104864- SKU:
- 09104864
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- FORGED
$122.00 -
Wössner Piston Kit 53.95mm for KTM SX125 2007-2022 8174DA
WOSSNER
$122.00KTM SX125 riders demand piston kits that survive the rigors of competitive 2-stroke racing without sacrificing reliability or precision. The Wössner 8174DA delivers exactly that—a complete, ready-to-install kit engineered to reduce friction, minimize...09104869- SKU:
- 09104869
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
$122.00 -
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
