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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WORKS CONNECTION Engine Plug - Purple - Honda 24-P604
WORKS CONNECTION
$55.95Stock engine plugs are functional, but they're also an eyesore that compromises your bike's appearance and doesn't reflect the precision you've invested in elsewhere. WORKS CONNECTION engine plugs replace those plain factory pieces with CNC-machined...09501035- SKU:
- 09501035
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$55.95 -
WORKS CONNECTION Engine Plug - Purple - Yamaha 24-P551
WORKS CONNECTION
$55.95Stock engine plugs are prone to corrosion and aesthetic degradation, compromising both appearance and reliability on your Yamaha. The WORKS CONNECTION Engine Plug set delivers a precision-engineered replacement that combines durability with a...09501036- SKU:
- 09501036
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$55.95 -
WORKS CONNECTION Engine Plug - Purple - Honda 24-P491
WORKS CONNECTION
$38.50Engine bay aesthetics matter when you're investing in quality components—these WORKS CONNECTION plugs replace stock plastic covers with precision-machined aluminum that actually looks the part. Beyond appearance, the anodized finish provides superior...09501037- SKU:
- 09501037
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$38.50 -
WORKS CONNECTION Oil Fill Plug - Purple - Kawasaki/Suzuki 24-P194
WORKS CONNECTION
$38.50Stock plastic oil fill plugs degrade under heat cycling and can crack or strip, risking contamination and costly engine damage. The WORKS CONNECTION CNC-machined aluminum plug delivers durability and a professional appearance while maintaining a reliable...09501038- SKU:
- 09501038
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
$38.50 -
WORKS CONNECTION Oil Fill Plug - Purple - Honda 24-P079
WORKS CONNECTION
$38.50Stock plastic oil fill plugs are prone to cracking, stripping, and leaking—especially under the stress of high-rpm operation and frequent oil changes. The WORKS CONNECTION Oil Fill Plug replaces that weak point with a CNC-machined aluminum component that...09501039- SKU:
- 09501039
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$38.50 -
Wossner Yamaha YZ450F 2020-2022 WR450F 2021-2023 YZ450FX 2021-2023 Connecting Rod Kit P4085
WOSSNER
$174.00A connecting rod is one of the most critical components in your four-stroke engine—it bears enormous loads with every combustion cycle, and failure means catastrophic engine damage. The Wossner P4085 is engineered to withstand the demands of...09230703- SKU:
- 09230703
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
$174.00 -
Wossner Piston Kit 94.95 mm for 2024-2025 Gas Gas EC 450F 2023-2025 KTM 450 XCF-W 4070DA
WOSSNER
$214.00Stock pistons wear out and lose compression, killing your engine's responsiveness and efficiency. This Wossner piston kit restores peak performance with aerospace-grade materials and precision engineering—keeping your 450F or 450 XCF-W running strong...09106834- SKU:
- 09106834
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$214.00 -
Wossner Piston Kit 96.96mm Yamaha YZ450F 2023-2025 4085DA
WOSSNER
$224.00When your YZ450F's original piston wears down, power delivery suffers and engine noise increases. The Wossner 96.96mm piston kit restores—and exceeds—OEM performance with aerospace-grade materials and precision engineering designed specifically for your...09106838- SKU:
- 09106838
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$224.00 -
Wossner Piston Kit 96.96mm Yamaha YZ450F 2023-2026 4086DA
WOSSNER
$244.00If you're rebuilding your YZ450F or pushing higher RPMs, piston wear directly impacts your engine's reliability and power delivery. Wossner's 96.96mm kit delivers the precision fit and durability you need to maximize performance without compromising...09106839- SKU:
- 09106839
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$244.00 -
Wossner Piston Kit 96.96 mm Yamaha YZ450F 2023-2025 4092DA
WOSSNER
$224.00Stock pistons in your YZ450F are engineered for durability, not peak performance—and they show it through higher operating temperatures and reduced power output. The Wossner 96.96 mm Piston Kit replaces factory internals with aerospace-grade forgings...09106841- SKU:
- 09106841
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$224.00 -
Wossner Piston Kit 96.96 mm Yamaha YZ450F 2023-2025 4093DA
WOSSNER
$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 geometry while reducing ring blow-by and noise, giving...09106842- SKU:
- 09106842
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$244.00 -
Wossner Piston Kit 51.95 mm Big Bore 105 cc 2021-2024 Gas Gas MC 85 8329DA
WOSSNER
$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 friction losses while keeping combustion noise...09106846- SKU:
- 09106846
- Availability:
- Ships Same Business Day
- Weight:
- 6.05 LBS
$152.00 -
Wossner Piston Kit 52.45mm Kawasaki KX112 2022-2023 8322DA
WOSSNER
$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 consistent performance lap after lap. This is a complete,...09106847- SKU:
- 09106847
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$112.00 -
Wossner Piston Kit 53.95mm Yamaha YZ125 2022-2025 8321DA
WOSSNER
$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 precision engineering that restores your engine's...09106855- SKU:
- 09106855
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$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 across all critical surfaces, giving you the peace of...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 routine maintenance, VERTEX gaskets provide reliable sealing...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 specifications with precision tolerances, ensuring a...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 seals engineered to withstand sustained high RPMs and...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 delivers OEM-quality gasket materials engineered to...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 consolidates all necessary gaskets into one package, engineered...09348006- SKU:
- 09348006
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$70.38
