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!
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- Price
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On Sale
Wossner Piston Kit 96.96 mm Yamaha YZ450F 2023-2025 4093DA
WOSSNER
MSRP: $244.00Now: $231.80Was: $244.00High-mileage YZ450F engines suffer from increased piston rock and friction, which directly impact throttle response and reliability on the track. This Wossner piston kit restores OEM-spec compression...09106842- SKU:
- 09106842
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $244.00Now: $231.80Was: $244.00 -
On Sale
Wossner Piston Kit 87.95 mm KTM 350 2023-2025 4091DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00Factory pistons wear, lose compression, and compromise your bike's throttle response. The Wossner 87.95 mm piston kit restores peak performance with aerospace-grade construction, reducing friction...09106843- SKU:
- 09106843
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit 94.95mm KTM 450 SX-F 2023-2025 4075DA
WOSSNER
MSRP: $244.00Now: $231.80Was: $244.00If you're running a KTM 450 SX-F and pushing hard on the track or trail, your factory piston won't hold up to sustained high-RPM abuse. This Wossner kit gives you a purpose-built replacement...09106844- SKU:
- 09106844
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $244.00Now: $231.80Was: $244.00 -
On Sale
Wossner Piston Kit 51.95 mm Big Bore 105 cc 2021-2024 Gas Gas MC 85 8329DA
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00When you're running a big-bore 105cc build, piston quality directly determines engine longevity and throttle response. Wossner's aerospace-grade aluminum and permanent skirt coating eliminate...09106846- SKU:
- 09106846
- Availability:
- Ships Same Business Day
- Weight:
- 6.05 LBS
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner Piston Kit 52.45mm Kawasaki KX112 2022-2023 8322DA
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00Factory pistons wear out—especially under racing conditions or aggressive riding. The Wossner 52.45mm Piston Kit restores lost compression, reduces noise, and delivers the reliability you need for...09106847- SKU:
- 09106847
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Piston Kit 53.95mm Yamaha YZ125 2022-2025 8321DA
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00If you're running a YZ125 at the edge of its limits, piston wear is inevitable—and a worn piston directly kills performance and reliability. This Wossner kit delivers OEM-quality construction with...09106855- SKU:
- 09106855
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $142.00Now: $134.90Was: $142.00 -
VERTEX Top End Gasket Kit - Honda 810267
VERTEX
$86.55A leaking or degraded top end gasket compromises combustion seal integrity and invites coolant/oil contamination into your engine. The VERTEX 810267 gasket kit restores factory sealing specifications...09347999- SKU:
- 09347999
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$86.55 -
VERTEX Top End Gasket Kit - Husaberg/Husqvarna/KTM 810333
VERTEX
$48.37A quality top-end gasket kit is essential for maintaining proper compression and preventing oil seepage in high-performance engines. Whether you're rebuilding after a race season or performing...09348000- SKU:
- 09348000
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$48.37 -
VERTEX Top End Gasket Kit - Honda 810262
VERTEX
$78.72A top-end gasket kit is critical for maintaining compression integrity and preventing oil/coolant leaks that compromise engine reliability and performance. VERTEX gasket kits are engineered to OEM...09348001- SKU:
- 09348001
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$78.72 -
VERTEX Top End Gasket Kit - KTM 810328
VERTEX
$82.17A failing top-end gasket compromises compression, causes oil seepage, and forces an engine rebuild to fail prematurely. The VERTEX 810328 gasket kit eliminates guesswork by supplying OEM-equivalent...09348004- SKU:
- 09348004
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$82.17 -
VERTEX Top End Gasket Kit - Yamaha 810676
VERTEX
$70.38A top-end gasket kit is essential maintenance for any high-performance engine—it seals critical surfaces where combustion pressure and thermal cycling demand absolute reliability. The VERTEX 810676...09348005- SKU:
- 09348005
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$70.38 -
VERTEX Top End Gasket Kit - Yamaha 810677
VERTEX
$70.38A complete top-end gasket kit is essential when rebuilding or refreshing your Yamaha engine—sealing failures lead to compression loss, oil weeping, and costly downtime. The VERTEX 810677 kit...09348006- SKU:
- 09348006
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$70.38 -
VERTEX Top End Gasket Kit - Honda 8100000
VERTEX
$82.30A quality top-end gasket kit is essential for maintaining compression integrity and preventing coolant or oil seepage in high-performance engines. Whether you're rebuilding after a race season or...09348007- SKU:
- 09348007
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$82.30 -
VERTEX Top End Gasket Kit - Suzuki 810505
VERTEX
$22.38A compromised top-end gasket seal leads to oil weeping, combustion leakage, and accelerated wear on your Suzuki engine. The VERTEX 810505 Kit delivers OEM-equivalent sealing surfaces with precision...09348010- SKU:
- 09348010
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$22.38 -
VERTEX Top End Gasket Kit - Husaberg/Husqvarna/KTM 810335
VERTEX
$41.03A failing top-end gasket doesn't just leak—it compromises combustion efficiency, wastes fuel, and can lead to catastrophic engine damage if left unchecked. The VERTEX 810335 gasket kit gives you...09348011- SKU:
- 09348011
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$41.03 -
VERTEX Top End Gasket Kit - Honda 810241
VERTEX
$52.63A leaking top-end gasket will compromise your engine's reliability and performance, whether you're on the track or the street. The VERTEX 810241 kit delivers OEM-quality sealing across all critical...09348015- SKU:
- 09348015
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$52.63 -
VERTEX Top End Gasket Kit - Yamaha 810690
VERTEX
$55.05A top-end rebuild demands precision sealing to prevent compression leaks and oil weeping that compromise performance and reliability. The VERTEX 810690 gasket kit delivers factory-engineered fitment...09348017- SKU:
- 09348017
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$55.05 -
VERTEX Top End Gasket Kit - Yamaha 810614
VERTEX
$24.92Top-end gasket failure compromises engine sealing and can lead to coolant/oil leakage, performance loss, and costly damage if left unaddressed. The VERTEX 810614 gasket kit provides OEM-equivalent...09348022- SKU:
- 09348022
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
$24.92 -
VERTEX Top End Gasket Kit - Yamaha 8100025
VERTEX
$80.70A failed top end gasket can compromise your entire engine's integrity—allowing coolant leaks, oil seepage, and combustion blow-by that quickly escalate into catastrophic failure. The VERTEX 8100025...09348023- SKU:
- 09348023
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$80.70 -
VERTEX Top End Gasket Kit - KTM 810309
VERTEX
$32.83A failing top-end gasket will compromise combustion chamber sealing, leading to compression loss, oil weeping, and accelerated engine wear. The VERTEX 810309 Kit delivers OEM-quality gasket materials...09348028- SKU:
- 09348028
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$32.83
