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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- Quantity
- Price
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On Sale
VINTCO Connecting Rod Kit KR2018
VINTCO
MSRP: $192.95Now: $179.44Was: $192.95A connecting rod kit is fundamental to reliable engine performance—it's the critical link between your crankshaft and piston, handling massive combustion forces with every revolution. The VINTCO...09230653- SKU:
- 09230653
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
MSRP: $192.95Now: $179.44Was: $192.95Qty in Cart: 0Quantity:Price:MSRP: $192.95Now: $179.44Was: $192.95Subtotal: -
On Sale
VINTCO Connecting Rod Kit KR2025
VINTCO
MSRP: $192.95Now: $179.44Was: $192.95A connecting rod kit is the foundation of engine reliability under extreme loads—whether you're pushing peak RPMs on the track or building a high-displacement street engine. The VINTCO KR2025...09230654- SKU:
- 09230654
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
MSRP: $192.95Now: $179.44Was: $192.95 -
On Sale
VINTCO Connecting Rod Kit KR2008
VINTCO
MSRP: $170.95Now: $158.98Was: $170.95A connecting rod kit is fundamental to engine reliability under high RPM and high-load conditions—whether you're building a race engine or upgrading an existing platform. The VINTCO KR2008 delivers...09230655- SKU:
- 09230655
- Availability:
- Ships Same Business Day
- Weight:
- 1.04 LBS
MSRP: $170.95Now: $158.98Was: $170.95 -
On Sale
VINTCO Connecting Rod Kit KR2014
VINTCO
MSRP: $181.95Now: $169.21Was: $181.95Stock connecting rods are often the weak link in high-revving or forced induction engines, leading to catastrophic failure under load. The VINTCO KR2014 is engineered with heavy-duty forged...09230656- SKU:
- 09230656
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $181.95Now: $169.21Was: $181.95 -
On Sale
VINTCO Connecting Rod Kit KR2051
VINTCO
MSRP: $95.95Now: $89.23Was: $95.95A connecting rod failure mid-race can cost you the entire season. The VINTCO KR2051 kit delivers OEM-equivalent durability with heavy-duty forged construction, designed to handle sustained high-RPM...09230657- SKU:
- 09230657
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
MSRP: $95.95Now: $89.23Was: $95.95Qty in Cart: 0Quantity:Price:MSRP: $95.95Now: $89.23Was: $95.95Subtotal: -
On Sale
VINTCO Connecting Rod Kit KR2038
VINTCO
MSRP: $181.95Now: $169.21Was: $181.95If you're building or rebuilding an engine that demands reliability under extreme loads, the VINTCO Connecting Rod Kit KR2038 delivers the strength and precision required to handle sustained high-RPM...09230658- SKU:
- 09230658
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
MSRP: $181.95Now: $169.21Was: $181.95 -
On Sale
VINTCO Connecting Rod Kit KR2029
VINTCO
MSRP: $192.95Now: $179.44Was: $192.95A connecting rod kit is the critical bridge between your crankshaft and piston—and factory components often become the limiting factor in high-output builds. The VINTCO KR2029 delivers heavy-duty...09230659- SKU:
- 09230659
- Availability:
- Ships Same Business Day
- Weight:
- 1.41 LBS
MSRP: $192.95Now: $179.44Was: $192.95 -
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 KR2055
VINTCO
MSRP: $101.71Now: $94.59Was: $101.71High-performance engine builds demand connecting rods that can handle sustained power delivery without failure. The VINTCO KR2055 combines forged durability with precision engineering to provide the...09230663- SKU:
- 09230663
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
MSRP: $101.71Now: $94.59Was: $101.71Qty in Cart: 0Quantity:Price:MSRP: $101.71Now: $94.59Was: $101.71Subtotal: -
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: $170.95Qty in Cart: 0Quantity:Price:MSRP: $170.95Now: $158.98Was: $170.95Subtotal: -
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 Connecting Rod Kit KR2028
VINTCO
MSRP: $192.95Now: $179.44Was: $192.95High-revving engines demand connecting rods that can handle sustained peak loads without failure. The VINTCO KR2028 is a forged-construction rod kit built for serious power applications, delivering...09230672- SKU:
- 09230672
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
MSRP: $192.95Now: $179.44Was: $192.95Qty in Cart: 0Quantity:Price:MSRP: $192.95Now: $179.44Was: $192.95Subtotal: -
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 KMB030
VINTCO
MSRP: $54.95Now: $51.10Was: $54.95A worn or damaged crankshaft bearing can compromise engine durability and performance, leading to catastrophic failure if left unaddressed. This VINTCO Main Bearing and Seal Kit delivers...09240652- SKU:
- 09240652
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
MSRP: $54.95Now: $51.10Was: $54.95Qty in Cart: 0Quantity:Price:MSRP: $54.95Now: $51.10Was: $54.95Subtotal: -
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
