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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- Qty in Cart
- Quantity
- Price
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VINTCO Crankshaft Assembly - Kawasaki CR2019
VINTCO
$389.95A crankshaft is the backbone of your engine's reliability—any weakness here compromises power delivery and longevity. The VINTCO CR2019 is engineered to Kawasaki OEM specifications using heavy-duty forged steel, ensuring it handles high-RPM loads without...09210948- SKU:
- 09210948
- Availability:
- Ships Same Business Day
- Weight:
- 6.82 LBS
$389.95Qty in Cart: 0Quantity:Price:$389.95Subtotal: -
WORKS CONNECTION Engine Plug - Purple - Kawasaki 24-P624
WORKS CONNECTION
$55.95Stock engine plugs are prone to corrosion and can detract from an otherwise meticulous build. These WORKS CONNECTION plugs deliver a precision-engineered replacement that combines durability with a clean, professional appearance. Whether you're prepping...09501034- SKU:
- 09501034
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$55.95 -
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 Crankshaft Assembly Yamaha YZ125 2022-2025 CS2077
WOSSNER
$342.00A worn or damaged crankshaft directly impacts engine reliability, power delivery, and longevity—especially in high-stress two-stroke applications like the YZ125. The Wossner CS2077 is a precision-engineered replacement assembly that restores your engine...09210946- SKU:
- 09210946
- Availability:
- Ships Same Business Day
- Weight:
- 6.02 LBS
$342.00Qty in Cart: 0Quantity:Price:$342.00Subtotal: -
Wossner Connecting Rod Kit Yamaha YZ125 2022-2026 P2077
WOSSNER
$132.00A connecting rod is the critical link between your piston and crankshaft—when it fails, your engine fails. The Wossner P2077 kit replaces worn or damaged rods with precision-engineered components that restore reliable power delivery and reduce the risk...09230679- SKU:
- 09230679
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$132.00Qty in Cart: 0Quantity:Price:$132.00Subtotal: -
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 Performance Connecting Rod Kit KTM 250SX-F 2023-2025 P4087-R
WOSSNER
$344.00A connecting rod is the critical link between your piston and crankshaft—any compromise in strength or precision directly impacts engine reliability and power delivery. The Wossner P4087-R is engineered to OEM specifications with materials and tolerances...09230704- SKU:
- 09230704
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$344.00 -
Wossner Performance Connecting Rod Kit Kawasaki KX112 2022-2025 P2078-R
WOSSNER
$242.00A connecting rod kit is a critical internal engine component that directly impacts your KX112's reliability under load and at high RPM. Wossner's precision engineering ensures minimal friction losses and maximum strength when you're pushing your bike to...09230705- SKU:
- 09230705
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$242.00Qty in Cart: 0Quantity:Price:$242.00Subtotal: -
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 80.95mm KTM SX-F250 2023-2024 4077DA
WOSSNER
$204.00Factory pistons wear out, and when they do, your engine performance takes a hit. This Wossner kit delivers OEM-quality replacement with measurable improvements in ring sealing, friction reduction, and throttle response. If you're rebuilding your...09106835- SKU:
- 09106835
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$204.00 -
Wossner Piston Kit 80.95 mm KTM 250 SX-F 2023-2025 4090DA
WOSSNER
$244.00The stock piston in your KTM 250 SX-F is a wear item—and when it starts to go, engine performance degrades fast. Wossner's 80.95 mm piston kit restores full power delivery while improving durability and reducing friction losses, making it the ideal...09106836- SKU:
- 09106836
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$244.00 -
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 95.95mm Piston Kit for Kawasaki KX450F 2016-2018 4087DA
WOSSNER
$224.00A quality piston kit is foundational to engine reliability and performance—especially on high-demand applications like the KX450F. Worn or substandard pistons create ring blow-by, increased friction, and power loss. The Wossner 95.95mm Piston Kit...09106840- SKU:
- 09106840
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$224.00 -
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
