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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Hot Cams Exhaust Camshaft Stage 1 & 2 Yamaha YZ250F 2019-2020 HC00122
HOT CAMS
$298.15If you're running a Yamaha YZ250F and want measurable gains in throttle response and midrange power, a quality exhaust camshaft is one of the highest-ROI upgrades available. This Hot Cams Stage 1 & 2...09251600- SKU:
- 09251600
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
$298.15 -
Hot Cams Stage 2 Intake Camshaft for Yamaha YZ250F 2019-2020 HC00125
HOT CAMS
$267.70If you're running a YZ250F and want tangible performance gains without a complete engine rebuild, the Hot Cams Stage 2 Intake Camshaft delivers measurable mid to top-end power increases where it...09251601- SKU:
- 09251601
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$267.70 -
Hot Cams Camshaft Chain Roller Kit Honda CRF100F 2004-2009 2011-2013 HCDID25H090
HOT CAMS
$43.95A worn or failing camshaft chain roller can cause timing issues, increased engine noise, and catastrophic internal damage if it fails completely. The Hot Cams roller kit replaces critical wear points...09251604- SKU:
- 09251604
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$43.95 -
JE PISTONS Piston Kit - 95.00 mm - Gas Gas | Husqvarna | KTM 393215
JE PISTONS
$329.99Whether you're rebuilding after a top-end overhaul or upgrading to tighter tolerances, a quality piston kit is non-negotiable for reliable power delivery and engine longevity. JE Pistons delivers the...09106852- SKU:
- 09106852
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$329.99 -
JE PISTONS Piston Kit - 95.00 mm - Kawasaki 395091
JE PISTONS
$432.99When you're pushing your Kawasaki to its limits, stock pistons become your bottleneck. JE Pistons' 95.00 mm kit delivers the precision engineering and durability required for sustained high-RPM...09106850- SKU:
- 09106850
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$432.99 -
JE PISTONS Piston Kit - 95.00 mm - Kawasaki 395092
JE PISTONS
$432.99If you're pushing your Kawasaki engine to its limits, factory pistons won't cut it. JE Pistons' 95.00 mm kit is engineered with 2618-T6 forged aluminum—the same material trusted in professional...09106851- SKU:
- 09106851
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
$432.99 -
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 -
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 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 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 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
