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
Wossner Piston Kit Suzuki RM-Z250 2010-2025 76.96mm 8781DA
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00The Wossner 8781DA piston kit is purpose-built for serious RM-Z250 riders who demand reliability and consistent performance across high-RPM, high-load riding conditions. Factory pistons wear out...09104983- SKU:
- 09104983
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MODEL:
- PRO SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON SIZE METRIC:
- 76.96 MM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON KIT
MSRP: $184.00Now: $174.80Was: $184.00 -
On Sale
Wossner 76.97mm Piston Kit for Suzuki RM-Z250 2010-2019 8781DB
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00If you're running a RM-Z250 and expecting reliable power delivery through every race, a quality piston kit isn't negotiable. Worn or stock pistons compromise combustion efficiency, increase friction...09104984- SKU:
- 09104984
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.97 MM
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 77.01 MM
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON KIT
MSRP: $184.00Now: $174.80Was: $184.00Qty in Cart: 0Quantity:Price:MSRP: $184.00Now: $174.80Was: $184.00Subtotal: -
On Sale
Wossner Piston Kit 87.95mm KTM 350 SX-F 2011-2020 8807DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00The Wossner 8807DA piston kit restores your KTM 350 SX-F to factory specifications—or beyond—with OEM-quality internals that deliver reliable power across the rev range. Whether you're running stock...09104986- SKU:
- 09104986
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 87.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 88.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit 87.96mm for 2011-2023 KTM 350 SX-F 8807DB
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00If you're running a 2011-2023 KTM 350 SX-F, piston wear directly impacts engine response, efficiency, and longevity. The Wössner 8807DB kit delivers precision-engineered replacement with premium...09104987- SKU:
- 09104987
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 88.01 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 87.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit 87.97mm for KTM 350 SX-F 2011-2022 8807DC
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00The stock piston in your KTM 350 SX-F experiences significant thermal and mechanical stress during aggressive riding. A quality replacement piston kit restores compression, reduces friction losses,...09104988- SKU:
- 09104988
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +0,02 MM
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 88.02 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 87.97 MM
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit 77.96mm Gas Gas EC 250 F 2021-2023 8865DA
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00The Wossner 8865DA piston kit delivers the reliability and precision your Gas Gas EC 250 F demands, whether you're pushing hard on the track or maintaining peak performance in the dirt. Factory...09104993- SKU:
- 09104993
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 77.96 MM
- BORE SIZE METRIC:
- 78.00 MM
- PRODUCT NAME:
- PISTON KIT
MSRP: $184.00Now: $174.80Was: $184.00Qty in Cart: 0Quantity:Price:MSRP: $184.00Now: $174.80Was: $184.00Subtotal: -
On Sale
Wossner Piston Kit Sherco 300 SEF-R 2014-2018 8906DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00When you're pushing a 2-stroke to its limits, piston failure isn't an option—it's a catastrophe. The Wossner 8906DA delivers the durability and precision engineering needed to survive high-RPM abuse...09104998- SKU:
- 09104998
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PISTON SIZE METRIC:
- 83.94 MM
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- OEM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- FORGED
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit Honda CRF450R 2017-2025 14.0:1 8937DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00Stock pistons can't handle the demands of high-performance riding—heat cycling, detonation, and sustained RPMs break them down. The Wössner Piston Kit for your CRF450R replaces worn or damaged...09106159- SKU:
- 09106159
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON SIZE METRIC:
- 95.95 MM
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit Kawasaki KX450F 2015 12.8:1 8920DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00The Wossner Piston Kit is engineered specifically for the Kawasaki KX450F to deliver the reliability and performance demanded by serious racers and high-mileage riders. Stock pistons wear under...09106163- SKU:
- 09106163
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 95.98 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 96.03 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $204.00Now: $193.80Was: $204.00 -
On Sale
Wossner Piston Kit Kawasaki KX450F 2016-2018 8931DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00The Wossner Piston Kit is engineered to restore or upgrade your KX450F's top-end with German precision and proven durability. OEM pistons wear, lose ring seal, and reduce power—this complete kit...09106164- SKU:
- 09106164
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COMPRESSION RATIO IMPERIAL:
- 12.8:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 96.03 MM
- MODEL:
- STANDARD SERIES
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON SIZE METRIC:
- 95.98 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $204.00Now: $193.80Was: $204.00Qty in Cart: 0Quantity:Price:MSRP: $204.00Now: $193.80Was: $204.00Subtotal: -
On Sale
Wossner Piston Kit Kawasaki KX250F 2017-2018 14.0:1 CR 8932DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00When you're pushing your KX250F to its limits, your piston needs to match your ambition. The Wössner 8932DA delivers the precision engineering and durability required to handle aggressive riding...09106165- SKU:
- 09106165
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 77.00 MM
MSRP: $204.00Now: $193.80Was: $204.00Qty in Cart: 0Quantity:Price:MSRP: $204.00Now: $193.80Was: $204.00Subtotal: -
On Sale
Wossner Piston Kit Kawasaki KX250F 2017-2018 14.0:1 CR 8932DB
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00When you're pushing your KX250F to the limit, stock pistons become your weakest link. The Wossner 14.0:1 CR piston kit delivers the thermal stability and precision clearances required to survive...09106166- SKU:
- 09106166
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE - OVERSIZE:
- +0,01 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- PISTON SIZE METRIC:
- 76.97 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.01 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $204.00Now: $193.80Was: $204.00 -
On Sale
Wossner Piston Kit KTM 350 EXC-F 2012-2016 8941DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00Stock pistons wear out—especially in high-performance applications where aggressive riding and forced induction push your EXC-F 350 to its limits. The Wössner 8941DA gives you German-engineered...09106167- SKU:
- 09106167
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 88.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 87.95 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit Kawasaki KX450 2019-2023 12.6:1 8958DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00When you're pushing a KX450 to its limits, your piston is taking a beating—and a worn or inadequate unit will cost you horsepower, throttle response, and reliability. The Wossner 8958DA is...09106168- SKU:
- 09106168
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 95.96 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $204.00Now: $193.80Was: $204.00 -
On Sale
Wossner Piston Kit Kawasaki KX450 2019-2023 12.6:1 CR 8958DB
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00The Wossner Piston Kit for your KX450 delivers the durability and thermal stability demanded by modern motocross competition. With 4032 T6 forged aluminum construction and a permanent skirt coating,...09106169- SKU:
- 09106169
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON SIZE METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- BORE SIZE METRIC:
- 96.01 MM
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- MODEL:
- PREMIUM SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $204.00Now: $193.80Was: $204.00 -
On Sale
Wossner Piston Ring Set Yamaha YZ250F 2019-2024 RIK77.00D
WOSSNER
MSRP: $48.50Now: $46.08Was: $48.50Piston rings are critical to engine longevity—they seal combustion pressure, regulate oil consumption, and maintain compression during high-RPM operation. Worn or damaged rings lead to blow-by,...09120755- SKU:
- 09120755
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 77.00 MM
- PRODUCT NAME:
- PISTON RING SET
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $48.50Now: $46.08Was: $48.50Qty in Cart: 0Quantity:Price:MSRP: $48.50Now: $46.08Was: $48.50Subtotal: -
On Sale
Wossner Piston Ring Set 66mm Honda CRF150R 2007-2020 660XKS-3
WOSSNER
MSRP: $38.50Now: $36.58Was: $38.50Worn piston rings directly rob your CRF150R of compression and power—leading to blow-by, oil burning, and sluggish throttle response. The Wossner 660XKS-3 ring set restores factory-spec sealing...09120672- SKU:
- 09120672
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 66.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON RING SET
- UNITS:
- EACH
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
MSRP: $38.50Now: $36.58Was: $38.50Qty in Cart: 0Quantity:Price:MSRP: $38.50Now: $36.58Was: $38.50Subtotal: -
On Sale
Wossner Piston Ring Set Husqvarna FC250 2014-2015 RIK78.00
WOSSNER
MSRP: $48.50Now: $46.08Was: $48.50Piston ring wear is one of the fastest ways to lose compression, power, and efficiency in a 2-stroke engine. The Wossner Piston Ring Set RIK78.00 is engineered to restore proper sealing and blow-by...09120692- SKU:
- 09120692
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING SET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 78.00 MM
- UNITS:
- SET
MSRP: $48.50Now: $46.08Was: $48.50Qty in Cart: 0Quantity:Price:MSRP: $48.50Now: $46.08Was: $48.50Subtotal: -
On Sale
Wossner 12x15x14.5 mm Top End Bearing for KTM 50 SX 2007-2022 N1001
WOSSNER
MSRP: $18.50Now: $17.58Was: $18.50Top-end bearing wear is one of the most common failure points in high-revving two-stroke engines, and a failing bearing will quickly cascade into catastrophic engine damage. The Wossner 12x15x14.5 mm...09240494- SKU:
- 09240494
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER METRIC:
- 12 MM
- LENGTH METRIC:
- 14.5 MM
- PRODUCT NAME:
- BEARING
- OUTSIDE DIAMETER METRIC:
- 15 MM
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
MSRP: $18.50Now: $17.58Was: $18.50 -
On Sale
Wossner Top End Bearing 14x18x16.5mm for 2002-2022 Yamaha YZ85 N1006
WOSSNER
MSRP: $18.50Now: $17.58Was: $18.50The Wossner N1006 top end bearing is a critical wear component in your YZ85's top end assembly—it directly impacts piston speed stability, combustion chamber seal, and overall engine longevity. A...09240447- SKU:
- 09240447
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BEARING
- LENGTH METRIC:
- 16.5 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- INSIDE DIAMETER METRIC:
- 14 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $18.50Now: $17.58Was: $18.50
