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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On Sale
Wiseco Cam Chain KTM 500 XCF-W 2012-2016 CC036
WISECO
MSRP: $94.95Now: $81.00Was: $94.95The cam chain is the backbone of your KTM's valve train—when it wears, performance suffers and catastrophic engine damage becomes a real risk. The Wiseco CC036 is precision-engineered to exceed OEM...09250654- SKU:
- 09250654
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
- NUMBER OF LINKS:
- 114
- UNITS:
- EACH
- CHAIN SIZE:
- 92RH2015
- PRODUCT NAME:
- CHAIN
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
MSRP: $94.95Now: $81.00Was: $94.95Qty in Cart: 0Quantity:Price:MSRP: $94.95Now: $81.00Was: $94.95Subtotal: -
On Sale
Wiseco Top End Bearing 20 x 25 x 21.8 mm for Polaris 440 Pro X 2001-2003 B1039
WISECO
MSRP: $23.99Now: $20.00Was: $23.99Top-end bearing wear is one of the most common culprits behind loss of compression and reduced engine efficiency in high-mileage sleds. The Wiseco B1039 is a direct OEM replacement engineered to...09240124- SKU:
- 09240124
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 20 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 25 MM
- UNITS:
- EACH
- LENGTH METRIC:
- 21.8 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- SILICONE
- RIDING STYLE:
- WATERCRAFT
MSRP: $23.99Now: $20.00Was: $23.99Qty in Cart: 0Quantity:Price:MSRP: $23.99Now: $20.00Was: $23.99Subtotal: -
On Sale
Wiseco Top End Bearing Kawasaki KX65 2000-2021 B1043
WISECO
MSRP: $25.95Now: $20.00Was: $25.95The top end bearing is critical to engine longevity—it supports high-RPM loads that can quickly wear inferior components. Wiseco's case-hardened, high-silicon aluminum construction delivers the...09240125- SKU:
- 09240125
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- PISTON
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 14.8 MM
- LENGTH METRIC:
- 12 MM
- MATERIAL:
- ALUMINUM
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 16 MM
MSRP: $25.95Now: $20.00Was: $25.95 -
On Sale
Wiseco Engine Rebuild Kit for Kawasaki KX80 1991-1997 PWR119-101
WISECO
MSRP: $474.95Now: $404.00Was: $474.95Engine wear is inevitable in high-performance 2-stroke and 4-stroke applications, but a complete rebuild doesn't have to compromise reliability or performance. The Wiseco PWR119-101 Engine Rebuild...09031605- SKU:
- 09031605
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
MSRP: $474.95Now: $404.00Was: $474.95Qty in Cart: 0Quantity:Price:MSRP: $474.95Now: $404.00Was: $474.95Subtotal: -
On Sale
Wiseco Engine Rebuild Kit Kawasaki KX80 1998-2000 PWR119-103
WISECO
MSRP: $474.95Now: $404.00Was: $474.95A seized engine ends your season. The Wiseco Engine Rebuild Kit PWR119-103 gives you everything needed for a complete top and bottom-end overhaul on your Kawasaki KX80, restoring your bike to factory...09031606- SKU:
- 09031606
- Availability:
- Ships Same Business Day
- Weight:
- 7.90 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $474.95Now: $404.00Was: $474.95Qty in Cart: 0Quantity:Price:MSRP: $474.95Now: $404.00Was: $474.95Subtotal: -
On Sale
Wiseco Garage Buddy Engine Rebuild Kit for 2016-2018 Yamaha YZ250F PWR216-101
WISECO
MSRP: $989.95Now: $841.00Was: $989.95When your Yamaha YZ250F's engine reaches the end of its service life, a quality rebuild is your best investment in consistent power and reliability. The Wiseco PWR216-101 kit eliminates the guesswork...09031663- SKU:
- 09031663
- Availability:
- Ships Same Business Day
- Weight:
- 11.55 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 77.00 MM
MSRP: $989.95Now: $841.00Was: $989.95Qty in Cart: 0Quantity:Price:MSRP: $989.95Now: $841.00Was: $989.95Subtotal: -
On Sale
Wiseco Piston Kit Standard Bore 56mm Yamaha YZ125 1990-1992 594M05600
WISECO
MSRP: $154.95Now: $132.00Was: $154.95The OEM piston in your YZ125 is the heartbeat of your engine—and wear compromises both power and reliability. The Wiseco Piston Kit delivers CNC-precision engineering with high-silicone aerospace...09101681- SKU:
- 09101681
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- PRODUCT NAME:
- PISTON
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 50.70 MM
- UNITS:
- EACH
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit 95mm 12.5:1 Compression for Yamaha WR450F 2010-2015 PK1359
WISECO
MSRP: $344.95Now: $293.00Was: $344.95The stock piston in your WR450F or YZ450F limits peak performance and durability under aggressive riding conditions. The Wiseco PK1359 replaces it with a precision-forged unit that delivers...09030564- SKU:
- 09030564
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE METRIC:
- 95.00 MM
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 94.94 MM
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 63.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $344.95Now: $293.00Was: $344.95Qty in Cart: 0Quantity:Price:MSRP: $344.95Now: $293.00Was: $344.95Subtotal: -
On Sale
Wiseco Piston Kit for Honda XR250R 1986-2004 PK1224
WISECO
MSRP: $274.95Now: $234.00Was: $274.95If you're running an XR250R hard—whether on the track or in the dirt—OEM pistons limit your engine's potential. The Wiseco PK1224 delivers measurable gains in horsepower and torque while maintaining...09030571- SKU:
- 09030571
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE - OVERSIZE METRIC:
- +5.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 59.50 MM
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 77.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
MSRP: $274.95Now: $234.00Was: $274.95Qty in Cart: 0Quantity:Price:MSRP: $274.95Now: $234.00Was: $274.95Subtotal: -
On Sale
Wiseco Piston Kit 54.00 mm Oversize for Honda XR100R 1985-2003 4666M05400
WISECO
MSRP: $154.95Now: $132.00Was: $154.95When your Honda's original piston wears or you're ready to unlock more power, this Wiseco piston kit delivers the precision and durability needed for reliable performance across demanding riding...09100329- SKU:
- 09100329
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.4:1
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 103,00 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.00 MM
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit for KTM 85 SX 17/14 2003-2025 RE918M05200
WISECO
MSRP: $171.95Now: $127.00Was: $171.95Two-stroke engines demand pistons engineered for high RPM reliability and consistent power delivery—the Wiseco Racer Elite 2-Stroke Series Piston Kit is purpose-built for KTM 85 SX riders who refuse...09105102- SKU:
- 09105102
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
MSRP: $171.95Now: $127.00Was: $171.95 -
On Sale
Wossner Connecting Rod Honda CRF250R 2004-2017 P4001
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00When you're rebuilding a CRF250R engine for serious track duty or high-RPM reliability, your connecting rod needs to handle sustained stress without compromise. The Wossner P4001 is engineered...09230428- SKU:
- 09230428
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Connecting Rod for Suzuki RM-Z250 2007-2025 P4004
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00If you're rebuilding your RM-Z250 engine, the connecting rod is the critical link between your piston and crankshaft—it has to handle extreme combustion pressures and reciprocating forces without...09230431- SKU:
- 09230431
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $174.00Now: $165.30Was: $174.00Qty in Cart: 0Quantity:Price:MSRP: $174.00Now: $165.30Was: $174.00Subtotal: -
On Sale
Wossner Connecting Rod Suzuki DR-Z400 2000-2023 P4009
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00Stock connecting rods are a common failure point during high-rpm operation or when you increase displacement and boost levels on your DR-Z400. The Wossner P4009 replaces worn or damaged rods with...09230435- SKU:
- 09230435
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 4-STROKE
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Piston Kit 53.94mm Honda CR125R 1988-1989 8125DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00If you're rebuilding a 1988-1989 Honda CR125R 2-stroke, piston quality directly impacts power delivery, longevity, and throttle response. The Wossner 8125DA kit delivers OEM-spec fitment with premium...09104838- SKU:
- 09104838
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 53.94 MM
MSRP: $132.00Now: $125.40Was: $132.00Qty in Cart: 0Quantity:Price:MSRP: $132.00Now: $125.40Was: $132.00Subtotal: -
On Sale
Wossner Honda CR125R 1987 Single Ring Piston Kit 8126DA
WOSSNER
MSRP: $122.95Now: $116.80Was: $122.95If you're running a CR125R at the track or trail, piston wear directly impacts throttle response, compression, and reliability—and a worn OEM piston robs you of both power and longevity. The Wossner...09104839- SKU:
- 09104839
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 54.00 MM
- PISTON SIZE METRIC:
- 53.94 MM
MSRP: $122.95Now: $116.80Was: $122.95Qty in Cart: 0Quantity:Price:MSRP: $122.95Now: $116.80Was: $122.95Subtotal: -
On Sale
Wossner Piston Kit KTM 350 EXC-F 2012-2016 12.3:1 CR 8885DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00If you're running a KTM 350 EXC-F hard, OEM pistons won't cut it. The Wossner 8885DA delivers the strength and precision engineering needed to handle aggressive riding and high-load conditions...09106127- SKU:
- 09106127
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE SIZE METRIC:
- 88.00 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 87.95 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- UNITS:
- KIT
MSRP: $214.00Now: $203.30Was: $214.00Qty in Cart: 0Quantity:Price:MSRP: $214.00Now: $203.30Was: $214.00Subtotal: -
On Sale
Wossner Piston Kit KTM 250 SX 2019 8898DB
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00When you're pushing a 250 SX to its limits, piston failure isn't an option—it's a catastrophe. The Wossner 8898DB is engineered to handle sustained high RPM loads and aggressive riding conditions...09106132- SKU:
- 09106132
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 95.01 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- RIDING STYLE:
- STREET
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- UNITS:
- KIT
MSRP: $214.00Now: $203.30Was: $214.00Qty in Cart: 0Quantity:Price:MSRP: $214.00Now: $203.30Was: $214.00Subtotal: -
On Sale
Wossner Piston Kit 67.4mm Kawasaki KX250 1990-1991 8109DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner Piston Kit 8109DA is engineered to deliver the reliability and performance your KX250 demands during high-RPM racing and trail riding. Built from 4032 T6 forged aluminum and finished with...09105532- SKU:
- 09105532
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 67.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.34 MM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal: -
On Sale
Wossner Piston Kit Kawasaki KX250 1990-1991 8109DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00When running a high-strung 2-stroke engine like the KX250, piston durability directly impacts reliability and peak power delivery. Wossner's 8109DB kit delivers OEM-quality construction with German...09105533- SKU:
- 09105533
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.35 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 67.41 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- TYPE:
- DUAL RING
MSRP: $152.00Now: $144.40Was: $152.00Qty in Cart: 0Quantity:Price:MSRP: $152.00Now: $144.40Was: $152.00Subtotal:
