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
VINTCO Connecting Rod Kit KR2012
VINTCO
MSRP: $192.95Now: $179.44Was: $192.95A connecting rod failure mid-race or mid-rebuild costs time and money. The VINTCO KR2012 is engineered with heavy-duty forged construction to handle sustained high-RPM loads, while optimized bearing...09230660- SKU:
- 09230660
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
MSRP: $192.95Now: $179.44Was: $192.95 -
On Sale
VINTCO Connecting Rod Kit KR2019
VINTCO
MSRP: $181.95Now: $169.21Was: $181.95A connecting rod kit is only as strong as its weakest component—and that's where the VINTCO KR2019 separates itself from budget alternatives. Heavy-duty forged construction ensures your engine can...09230661- SKU:
- 09230661
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
MSRP: $181.95Now: $169.21Was: $181.95 -
On Sale
VINTCO Connecting Rod Kit KR2026
VINTCO
MSRP: $192.95Now: $179.44Was: $192.95Connecting rod failure is catastrophic—it destroys engines and ends racing seasons. The VINTCO KR2026 is built from forged construction that handles peak combustion pressures and sustained high-RPM...09230666- SKU:
- 09230666
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
MSRP: $192.95Now: $179.44Was: $192.95 -
On Sale
VINTCO Connecting Rod Kit KR2041
VINTCO
MSRP: $277.95Now: $258.49Was: $277.95A connecting rod kit is critical for engine durability under high-RPM and boost conditions—cheap or worn rods are a primary failure point in performance builds. The VINTCO KR2041 delivers forged...09230667- SKU:
- 09230667
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
MSRP: $277.95Now: $258.49Was: $277.95 -
On Sale
VINTCO Connecting Rod Kit KR2040
VINTCO
MSRP: $277.95Now: $258.49Was: $277.95A connecting rod failure mid-race or mid-build will cost you far more than the right component upfront. The VINTCO KR2040 delivers forged construction that handles peak combustion pressures without...09230668- SKU:
- 09230668
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
MSRP: $277.95Now: $258.49Was: $277.95 -
On Sale
VINTCO Connecting Rod Kit KR2006
VINTCO
MSRP: $170.95Now: $158.98Was: $170.95A connecting rod failure can derail your entire engine build, which is why the VINTCO KR2006 is engineered with heavy-duty forged construction to handle the extreme loads of high-performance racing...09230669- SKU:
- 09230669
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
MSRP: $170.95Now: $158.98Was: $170.95 -
On Sale
VINTCO Connecting Rod Kit KR2013
VINTCO
MSRP: $181.95Now: $169.21Was: $181.95If you're building or rebuilding an engine for sustained high-performance use, connecting rod failure isn't an option—it's a catastrophic loss of investment and track time. The VINTCO KR2013 kit...09230670- SKU:
- 09230670
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
MSRP: $181.95Now: $169.21Was: $181.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Honda KMB001
VINTCO
MSRP: $49.95Now: $46.45Was: $49.95A complete crankshaft installation demands precision-engineered bearings and seals that can handle sustained high-RPM loads without compromise. The VINTCO Main Bearing and Seal Kit delivers...09240649- SKU:
- 09240649
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
MSRP: $49.95Now: $46.45Was: $49.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Honda KMB002
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A worn or failing crankshaft bearing kit will cause increased friction, metal-to-metal contact, and catastrophic engine damage if left unaddressed. The VINTCO KMB002 delivers OEM-grade bearings and...09240650- SKU:
- 09240650
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Honda KMB004
VINTCO
MSRP: $49.95Now: $46.45Was: $49.95A crankshaft rebuild demands precision bearings and seals that won't compromise reliability under sustained load and RPM. The VINTCO KMB004 kit eliminates the guesswork of sourcing individual...09240653- SKU:
- 09240653
- Availability:
- Ships Same Business Day
- Weight:
- 1.81 LBS
MSRP: $49.95Now: $46.45Was: $49.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Honda KMB006
VINTCO
MSRP: $47.95Now: $44.59Was: $47.95Main bearing and seal failure compromises engine reliability and can lead to catastrophic damage if left unaddressed. The VINTCO KMB006 kit delivers OEM-spec components engineered for precise...09240655- SKU:
- 09240655
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
MSRP: $47.95Now: $44.59Was: $47.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Honda KMB034
VINTCO
MSRP: $54.95Now: $51.10Was: $54.95A quality crankshaft installation demands precision-matched bearings and seals that maintain proper clearances and prevent oil leakage under high RPM stress. The VINTCO KMB034 kit delivers OEM-grade...09240656- SKU:
- 09240656
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
MSRP: $54.95Now: $51.10Was: $54.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Honda KMB031
VINTCO
MSRP: $44.95Now: $41.80Was: $44.95A failing crankshaft seal or worn main bearing will compromise engine reliability and performance—and catching these issues early requires a complete, quality bearing and seal kit. The VINTCO KMB031...09240658- SKU:
- 09240658
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
MSRP: $44.95Now: $41.80Was: $44.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB007
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A crankshaft rebuild demands precision and reliability—this kit delivers both with Japanese-manufactured bearings and seals engineered to Kawasaki specifications. Whether you're completing a full...09240659- SKU:
- 09240659
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB011
VINTCO
MSRP: $47.95Now: $44.59Was: $47.95A compromised crankshaft bearing or seal can silently degrade engine performance and lead to catastrophic failure. The VINTCO KMB011 Main Bearing and Seal Kit eliminates guesswork by providing...09240661- SKU:
- 09240661
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $47.95Now: $44.59Was: $47.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB010
VINTCO
MSRP: $47.95Now: $44.59Was: $47.95A worn crankshaft bearing or failing seal will compromise engine efficiency, increase operating temperatures, and accelerate internal wear—ultimately shortening your engine's lifespan. The VINTCO...09240662- SKU:
- 09240662
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $47.95Now: $44.59Was: $47.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Kawasaki KMB008
VINTCO
MSRP: $29.95Now: $27.85Was: $29.95A reliable crankshaft installation depends on precision-engineered bearings and seals that can withstand sustained load and RPM cycles. The VINTCO Main Bearing and Seal Kit supplies OEM-quality...09240663- SKU:
- 09240663
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
MSRP: $29.95Now: $27.85Was: $29.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Maico KMB028
VINTCO
MSRP: $109.95Now: $102.25Was: $109.95A worn or damaged main bearing and seal assembly compromises crankshaft stability, leading to excessive runout, oil leakage, and accelerated engine wear. The VINTCO KMB028 kit delivers a complete...09240664- SKU:
- 09240664
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
MSRP: $109.95Now: $102.25Was: $109.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Maico KMB026
VINTCO
MSRP: $69.95Now: $65.05Was: $69.95A quality crankshaft installation depends on precision-engineered bearings and seals that can handle sustained RPMs and load cycling without degradation. The VINTCO Main Bearing and Seal Kit for...09240665- SKU:
- 09240665
- Availability:
- Ships Same Business Day
- Weight:
- 1.54 LBS
MSRP: $69.95Now: $65.05Was: $69.95 -
On Sale
VINTCO Main Bearing and Seal Kit - Maico KMB027
VINTCO
MSRP: $79.95Now: $74.35Was: $79.95A properly sealed and supported crankshaft is foundational to engine reliability and longevity. This VINTCO Main Bearing and Seal Kit supplies OEM-quality Japanese bearings and seals engineered to...09240666- SKU:
- 09240666
- Availability:
- Ships Same Business Day
- Weight:
- 1.46 LBS
MSRP: $79.95Now: $74.35Was: $79.95
