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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On Sale
VINTCO Crankshaft Assembly - Honda CR2017
VINTCO
MSRP: $245.95Now: $228.73Was: $245.95A compromised crankshaft compromises everything downstream—power delivery, engine longevity, and reliability. The VINTCO CR2017 forged steel assembly restores full engine integrity with precision...09210947- SKU:
- 09210947
- Availability:
- Ships Same Business Day
- Weight:
- 4.88 LBS
MSRP: $245.95Now: $228.73Was: $245.95 -
On Sale
VINTCO Crankshaft Assembly - Kawasaki CR2019
VINTCO
MSRP: $389.95Now: $362.65Was: $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...09210948- SKU:
- 09210948
- Availability:
- Ships Same Business Day
- Weight:
- 6.82 LBS
MSRP: $389.95Now: $362.65Was: $389.95Qty in Cart: 0Quantity:Price:MSRP: $389.95Now: $362.65Was: $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...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...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...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...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...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...09501039- SKU:
- 09501039
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$38.50 -
On Sale
Wossner Crankshaft Assembly Yamaha YZ125 2022-2025 CS2077
WOSSNER
MSRP: $342.00Now: $324.90Was: $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...09210946- SKU:
- 09210946
- Availability:
- Ships Same Business Day
- Weight:
- 6.02 LBS
MSRP: $342.00Now: $324.90Was: $342.00Qty in Cart: 0Quantity:Price:MSRP: $342.00Now: $324.90Was: $342.00Subtotal: -
On Sale
Wossner Connecting Rod Kit Yamaha YZ125 2022-2026 P2077
WOSSNER
MSRP: $132.00Now: $125.40Was: $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...09230679- SKU:
- 09230679
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
MSRP: $132.00Now: $125.40Was: $132.00 -
On Sale
Wossner Yamaha YZ450F 2020-2022 WR450F 2021-2023 YZ450FX 2021-2023 Connecting Rod Kit P4085
WOSSNER
MSRP: $174.00Now: $165.30Was: $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...09230703- SKU:
- 09230703
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Performance Connecting Rod Kit KTM 250SX-F 2023-2025 P4087-R
WOSSNER
MSRP: $344.00Now: $326.80Was: $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...09230704- SKU:
- 09230704
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $344.00Now: $326.80Was: $344.00 -
On Sale
Wossner Performance Connecting Rod Kit Kawasaki KX112 2022-2025 P2078-R
WOSSNER
MSRP: $242.00Now: $229.90Was: $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...09230705- SKU:
- 09230705
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $242.00Now: $229.90Was: $242.00Qty in Cart: 0Quantity:Price:MSRP: $242.00Now: $229.90Was: $242.00Subtotal: -
On Sale
Wossner Piston Kit 94.95 mm for 2024-2025 Gas Gas EC 450F 2023-2025 KTM 450 XCF-W 4070DA
WOSSNER
MSRP: $214.00Now: $203.30Was: $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...09106834- SKU:
- 09106834
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $214.00Now: $203.30Was: $214.00 -
On Sale
Wossner Piston Kit 80.95mm KTM SX-F250 2023-2024 4077DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $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,...09106835- SKU:
- 09106835
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $204.00Now: $193.80Was: $204.00 -
On Sale
Wossner Piston Kit 80.95 mm KTM 250 SX-F 2023-2025 4090DA
WOSSNER
MSRP: $244.00Now: $231.80Was: $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...09106836- SKU:
- 09106836
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $244.00Now: $231.80Was: $244.00 -
On Sale
Wossner Piston Kit 96.96mm Yamaha YZ450F 2023-2025 4085DA
WOSSNER
MSRP: $224.00Now: $212.80Was: $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...09106838- SKU:
- 09106838
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $224.00Now: $212.80Was: $224.00 -
On Sale
Wossner Piston Kit 96.96mm Yamaha YZ450F 2023-2026 4086DA
WOSSNER
MSRP: $244.00Now: $231.80Was: $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...09106839- SKU:
- 09106839
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $244.00Now: $231.80Was: $244.00 -
On Sale
Wossner 95.95mm Piston Kit for Kawasaki KX450F 2016-2018 4087DA
WOSSNER
MSRP: $224.00Now: $212.80Was: $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,...09106840- SKU:
- 09106840
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
MSRP: $224.00Now: $212.80Was: $224.00Qty in Cart: 0Quantity:Price:MSRP: $224.00Now: $212.80Was: $224.00Subtotal: -
On Sale
Wossner Piston Kit 96.96 mm Yamaha YZ450F 2023-2025 4092DA
WOSSNER
MSRP: $224.00Now: $212.80Was: $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...09106841- SKU:
- 09106841
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $224.00Now: $212.80Was: $224.00
