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
Wossner Piston Kit 72.97 mm Beta RR 300 Enduro 2022-2026 8324DC
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00When you're pushing your Beta RR 300 to its limits, a worn or compromised piston compromises everything—throttle response, reliability, and race-day consistency. The Wossner 72.97 mm piston kit...09106631- SKU:
- 09106631
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Piston Kit 61.95mm Beta RR 200 2019-2025 8325DA
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00A worn or damaged piston directly kills engine performance—increased friction, power loss, and potential catastrophic failure are inevitable without replacement. The Wossner 61.95mm piston kit...09106632- SKU:
- 09106632
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $142.00Now: $134.90Was: $142.00 -
On Sale
Wossner Piston Kit 61.96mm Beta 200 RR 2019-2023 8325DB
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00A worn or stock piston limits your Beta 200 RR's potential, causing increased friction, noise, and power loss through the engine cycle. This Wossner piston kit restores efficiency and responsiveness...09106633- SKU:
- 09106633
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
MSRP: $142.00Now: $134.90Was: $142.00 -
On Sale
Wossner Piston Kit 62.02 mm Beta RR 200 2019-2024 8325DC
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00Stock pistons accumulate carbon deposits and wear unevenly—especially in high-demand applications like the Beta RR 200. This Wossner kit replaces worn components with aerospace-grade aluminum and a...09106634- SKU:
- 09106634
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $142.00Now: $134.90Was: $142.00 -
On Sale
Wossner Piston Kit 53.95mm Yamaha YZ125 2005-2021 8302DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00The stock piston in your YZ125 is subject to constant thermal stress and detonation cycles that accelerate wear—especially if you're pushing higher RPMs or running aggressive jetting. A quality...09106635- SKU:
- 09106635
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 53.96mm Yamaha YZ125 2005-2021 8302DB
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00If you're running a YZ125 and looking to maximize power delivery and engine longevity, a quality piston kit is non-negotiable. Wossner's 53.96mm piston combines precision engineering with proven...09106636- SKU:
- 09106636
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 53.97mm Yamaha YZ125 2005-2021 8302DC
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00A worn or damaged piston directly compromises engine efficiency, power delivery, and longevity—especially critical for YZ125 two-stroke engines where precision tolerances are unforgiving. The Wossner...09106637- SKU:
- 09106637
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 53.93mm for Sherco 125 SE-R 2018-2025 8303DA
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00Your Sherco's engine performance depends on a piston that can handle sustained load cycles and elevated combustion pressures without sacrificing reliability. The Wossner 53.93mm piston kit delivers...09106638- SKU:
- 09106638
- Availability:
- Ships Same Business Day
- Weight:
- 0.48 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 53.94 mm Sherco 125 SE-R 2018-2025 8303DB
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00When your Sherco 125 SE-R demands peak performance, a worn piston compromises power delivery and increases mechanical noise. This Wossner 53.94 mm piston kit restores efficiency and reliability with...09106639- SKU:
- 09106639
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 53.95 mm Sherco 125 SE-R 2018-2025 8303DC
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00The stock piston in your 2018-2025 Sherco 125 SE-R experiences wear and friction that directly impact power delivery and engine longevity. This Wossner piston kit replaces that wear with...09106640- SKU:
- 09106640
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Piston Kit 66.35mm Yamaha YZ250 1999-2025 8217DA
WOSSNER
MSRP: $182.00Now: $172.90Was: $182.00The Wossner 8217DA piston kit delivers the compression ratio stability and durability your YZ250 demands, whether you're pushing hard at the track or rebuilding after a season of aggressive riding...09106641- SKU:
- 09106641
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
MSRP: $182.00Now: $172.90Was: $182.00 -
On Sale
Wossner Piston Kit 66.36mm Yamaha YZ250 1999-2020 8217DB
WOSSNER
MSRP: $182.00Now: $172.90Was: $182.00If you're running a YZ250 that sees serious track time, piston wear is inevitable—and it directly impacts combustion efficiency, throttle response, and engine longevity. This Wossner kit delivers...09106642- SKU:
- 09106642
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
MSRP: $182.00Now: $172.90Was: $182.00 -
On Sale
Wossner Piston Kit 89.42mm Honda CR500R 1985-2001 8229D050
WOSSNER
MSRP: $192.00Now: $182.40Was: $192.00Stock pistons limit your Honda CR500R's potential—they can't withstand the demands of aggressive riding or consistent high-RPM operation. The Wossner 89.42mm Piston Kit delivers the strength and...09106643- SKU:
- 09106643
- Availability:
- Ships Same Business Day
- Weight:
- 1.18 LBS
MSRP: $192.00Now: $182.40Was: $192.00 -
On Sale
Wossner Performance Connecting Rod Kit Yamaha YZ65 2018-2025 P2071-R
WOSSNER
MSRP: $242.00Now: $229.90Was: $242.00The connecting rod is the critical link between your piston and crankshaft—any weakness here directly compromises engine reliability and peak performance. Wossner's P2071-R kit delivers 8620 forged...09230684- SKU:
- 09230684
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
MSRP: $242.00Now: $229.90Was: $242.00 -
On Sale
Wossner Connecting Rod Kit Yamaha YZ250 2001-2023 P2072
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The connecting rod is the critical link between your crankshaft and piston—any flex or failure here directly kills power delivery and risks catastrophic engine damage. Wossner's P2072 kit is...09230685- SKU:
- 09230685
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Connecting Rod Kit Yamaha YZ85 2019-2025 P2072-R
WOSSNER
MSRP: $242.00Now: $229.90Was: $242.00A connecting rod is the critical link between your piston and crankshaft—it endures extreme pressure and temperature cycles on every stroke. This Wossner kit for the YZ85 uses 8620 forged alloy and...09230686- SKU:
- 09230686
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
MSRP: $242.00Now: $229.90Was: $242.00 -
On Sale
Wossner Connecting Rod Kit Beta RR 250 2013-2017 P2069
WOSSNER
MSRP: $122.00Now: $115.90Was: $122.00A connecting rod kit is critical to engine reliability, especially in high-RPM or competitive riding environments where stock components can fail under sustained stress. The Wossner P2069 is...09230687- SKU:
- 09230687
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
MSRP: $122.00Now: $115.90Was: $122.00 -
On Sale
Wossner Piston Kit 53.96mm Yamaha YZ125 2022-2025 8321DB
WOSSNER
MSRP: $132.00Now: $125.40Was: $132.00A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine longevity—especially critical in a high-revving two-stroke like the YZ125. The Wossner 8321DB...09106610- SKU:
- 09106610
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Cylinder 47.00 mm KTM 85SX 2018-2025 WBC8147A
WOSSNER
MSRP: $452.00Now: $429.40Was: $452.00A worn or damaged cylinder directly impacts your 85's power delivery, throttle response, and fuel efficiency. The Wossner 47.00mm cylinder restores—or exceeds—OEM performance through precision...09311110- SKU:
- 09311110
- Availability:
- Ships Same Business Day
- Weight:
- 2.12 LBS
MSRP: $452.00Now: $429.40Was: $452.00 -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - KX250F P5F0780071004A
ATHENA
MSRP: $289.95Now: $225.00Was: $289.95A worn or damaged piston directly impacts combustion efficiency, throttle response, and engine longevity—especially in high-demand off-road conditions. The ATHENA Piston Kit delivers OEM-exceeding...09031739- SKU:
- 09031739
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $289.95Now: $225.00Was: $289.95
