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 Connecting Rod Honda CR125R 1981-1984 P2040
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00If you're rebuilding a CR125R engine, the structural integrity of your connecting rod directly impacts reliability under peak combustion loads. Wössner's 8620 forged alloy construction, refined...09230571- SKU:
- 09230571
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Connecting Rod Honda CR500R 1987-2001 P2044
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner Connecting Rod P2044 is engineered for CR500R engines that demand reliability under extreme loads. If you're rebuilding your crankshaft or upgrading from OEM components, this forged rod...09230572- SKU:
- 09230572
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Connecting Rod for Kawasaki KX60 1983-2003 P2001
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The Wössner Connecting Rod for the KX60 is engineered for riders who demand reliability through complete engine rebuilds. When you're rebuilding a crankshaft, the connecting rod is the critical link...09230388- SKU:
- 09230388
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Connecting Rod Kawasaki KX125 1988-1991 P2033
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When you're rebuilding a KX125 top-end or refreshing a tired bottom-end, a compromised connecting rod is a guaranteed path to catastrophic failure. The Wossner P2033 is engineered specifically for...09230391- SKU:
- 09230391
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Connecting Rod KTM 300 EXC 1990-2003 P2024
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00If you're rebuilding a KTM 300 EXC engine, the connecting rod is where precision engineering directly translates to reliability under extreme conditions. The Wössner P2024 is engineered from 8620...09230392- SKU:
- 09230392
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Connecting Rod Honda CR125R 1988-2007 P2009
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00The Wössner Connecting Rod for your CR125R is engineered to handle the demands of competitive riding and high-rpm operation without compromise. A quality connecting rod is non-negotiable for...09230393- SKU:
- 09230393
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Connecting Rod Yamaha YZ125 2001-2004 P2017
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00A connecting rod is critical to crankshaft integrity—it's the component that translates combustion force into rotational power, and any weakness here compromises engine reliability and performance...09230394- SKU:
- 09230394
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Piston Kit 44.45mm Kawasaki KX65 2000-2025 8196DA
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00Stock pistons wear out under sustained racing loads, causing compression loss and power degradation. The Wossner 8196DA delivers precision-engineered durability with 4032 T6 forged aluminum and a...09104873- SKU:
- 09104873
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 44.50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 44.45 MM
MSRP: $102.00Now: $96.90Was: $102.00Qty in Cart: 0Quantity:Price:MSRP: $102.00Now: $96.90Was: $102.00Subtotal: -
On Sale
Wossner Piston Kit Yamaha YZ250 1999-2025 66.35mm 8216DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8216DA piston kit delivers the reliability and performance demanded by 2-stroke racers who can't afford downtime or power loss. Purpose-built for the YZ250 platform across three decades...09104877- SKU:
- 09104877
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit Yamaha YZ250 1999-2026 66.36mm 8216DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00The Wossner 8216DB piston kit is engineered for YZ250 2-stroke engines that demand reliability under sustained high RPM operation. Factory OEM pistons wear quickly under racing conditions—this kit's...09104878- SKU:
- 09104878
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE SIZE METRIC:
- 66.41 MM
- PISTON SIZE METRIC:
- 66.36 MM
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit 71.94mm KTM 300 EXC 2004-2005 8219DA
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00When you're pushing a 2-stroke to its limits, a worn or stock piston becomes your weakest link. The Wossner 8219DA delivers the reliability and efficiency you need to maintain peak power delivery and...09104880- SKU:
- 09104880
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.94 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 293 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $192.00Now: $182.40Was: $192.00Qty in Cart: 0Quantity:Price:MSRP: $192.00Now: $182.40Was: $192.00Subtotal: -
On Sale
Wossner Piston Kit 71.95mm KTM 300 EXC 2004-2005 8219DB
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00If you're running a KTM 300 EXC at the edge of performance, your piston is your most critical wear item. The Wossner 8219DB delivers the durability and efficiency required for sustained high-RPM...09104881- SKU:
- 09104881
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE:
- +0,01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 71.95 MM
- BORE SIZE METRIC:
- 72.01 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +0.01 MM
- DISPLACEMENT:
- 293 CC
MSRP: $192.00Now: $182.40Was: $192.00Qty in Cart: 0Quantity:Price:MSRP: $192.00Now: $182.40Was: $192.00Subtotal: -
On Sale
Wossner Piston Kit 53.95mm 2014-2025 Husqvarna TC125 8220DA
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When you're pushing a TC125 to its limits, your piston becomes the critical link between combustion and power delivery. The Wössner 8220DA keeps that link strong with purpose-built engineering that...09104884- SKU:
- 09104884
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
MSRP: $122.00Now: $115.90Was: $122.00Qty in Cart: 0Quantity:Price:MSRP: $122.00Now: $115.90Was: $122.00Subtotal: -
On Sale
Wossner Piston Kit 53.96mm 2007-2023 KTM 125 SX 8220DB
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00When your 2-stroke engine demands reliability under sustained high-load conditions, OEM pistons fall short of the mark. The Wössner 8220DB delivers the durability and reduced friction that separates...09104885- SKU:
- 09104885
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.01 MM
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 53.96 MM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner 85.93mm Piston Kit Kawasaki KX500 1988-2004 8228DA
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00The Wossner 85.93mm Piston Kit is engineered for KX500 2-stroke engines that demand reliability through extended competition seasons and high-RPM abuse. A complete top-end refresh with Wossner's...09104889- SKU:
- 09104889
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- DISPLACEMENT:
- 499 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 86.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 85.93 MM
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit for KTM 65 SX 2009-2025 8241DA
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00If you're running a KTM 65 SX and serious about consistent power delivery across repeated heat cycles, a quality piston kit is non-negotiable. The Wossner 8241DA replaces worn pistons that cause...09104890- SKU:
- 09104890
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE METRIC:
- 45.02 MM
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 44.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $102.00Now: $96.90Was: $102.00Qty in Cart: 0Quantity:Price:MSRP: $102.00Now: $96.90Was: $102.00Subtotal: -
On Sale
Wossner Piston Kit 45.03mm for KTM 65 SX 2009-2025 Husqvarna TC65 2017-2025 GasGas MC65 2021-2025 8241DB
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00The Wossner Piston Kit 8241DB delivers the precision engineering and durability demanded by serious 2-stroke racers and mechanics. Factory OEM pistons wear quickly under high RPM loads—this...09104891- SKU:
- 09104891
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 45.03 MM
- TYPE:
- SINGLE RING
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- 44.97 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $102.00Now: $96.90Was: $102.00Qty in Cart: 0Quantity:Price:MSRP: $102.00Now: $96.90Was: $102.00Subtotal: -
On Sale
Wossner Piston Kit Honda CR125R 1985-1986 8127DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00If you're rebuilding a CR125R or pushing your engine harder, piston longevity and ring seal integrity directly impact reliability and power delivery. The Wossner 8127DA delivers German-engineered...09105542- SKU:
- 09105542
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 123 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- 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 Piston Kit Kawasaki KX250 1987-1989 67.35mm 8129DB
WOSSNER
MSRP: $162.00Now: $153.90Was: $162.00Two-stroke engines demand pistons engineered for extreme combustion pressures and rapid cycling—stock components simply can't handle sustained high-RPM performance. The Wossner 8129DB delivers the...09105545- SKU:
- 09105545
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE METRIC:
- 67.41 MM
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- PISTON SIZE METRIC:
- 67.35 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.01 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: $162.00Now: $153.90Was: $162.00Qty in Cart: 0Quantity:Price:MSRP: $162.00Now: $153.90Was: $162.00Subtotal: -
On Sale
Wossner Piston Kit Yamaha YZ250 1988-1991 8134D150
WOSSNER
MSRP: $182.00Now: $172.90Was: $182.00If you're running a YZ250 two-stroke and want reliable power without sacrificing durability, a quality piston kit is non-negotiable. The Wossner 8134D150 delivers the precision engineering and...09105549- SKU:
- 09105549
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- BORE - OVERSIZE METRIC:
- +1.50 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 69.50 MM
- PISTON SIZE METRIC:
- 69.44 MM
- TYPE:
- DUAL RING
- BORE - OVERSIZE:
- +1,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
MSRP: $182.00Now: $172.90Was: $182.00Qty in Cart: 0Quantity:Price:MSRP: $182.00Now: $172.90Was: $182.00Subtotal:
