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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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HOT RODS Connecting Rod 8111
HOT RODS
$151.95If you're building or rebuilding a high-performance engine, your connecting rods need to survive extreme combustion pressures and RPM loads without failure. The HOT RODS 8111 combines proven OE-replacement geometry with metallurgical upgrades and...423301- SKU:
- 423301
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- 8620 STEEL
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$151.95 -
HOT RODS Connecting Rod 8128
HOT RODS
$138.95If you're building a high-rpm engine or rebuilding a worn-out block, connecting rod failure isn't an option. The HOT RODS 8128 combines OE-level reliability with heavy-duty materials and precision manufacturing to handle sustained high-revolution...423109- SKU:
- 423109
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-CYCLE
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
$138.95Qty in Cart: 0Quantity:Price:$138.95Subtotal: -
HOT RODS Connecting Rod 8112
HOT RODS
$151.95If you're building or rebuilding an engine that demands reliability under sustained high-RPM load, connecting rod quality directly impacts whether your engine survives a full season or grenades mid-race. The HOT RODS 8112 is engineered to handle extreme...423107- SKU:
- 423107
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-CYCLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$151.95 -
HOT RODS Connecting Rod 8108
HOT RODS
$159.95When you're pushing your engine to the limit, a weak connecting rod is a catastrophic failure waiting to happen. The HOT RODS 8108 delivers the durability and precision required for sustained high-RPM performance, whether you're rebuilding a stock engine...423102- SKU:
- 423102
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 8620 STEEL
$159.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850126
ATHENA
MSRP: $44.95Now: $40.00Was: $44.95A complete top-end rebuild demands gasket integrity you can trust—especially when operating at elevated temperatures or high RPM. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across all critical engine surfaces, eliminating the risk of...400510850126- SKU:
- 400510850126
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $44.95Now: $40.00Was: $44.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850082
ATHENA
MSRP: $32.95Now: $30.00Was: $32.95A complete engine rebuild demands gasket integrity at every critical sealing point—this Athena kit eliminates the risk of leak-prone piecemeal sourcing by delivering every top-end and full-engine gasket you need in one factory-matched set. The...400510850082- SKU:
- 400510850082
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $32.95Now: $30.00Was: $32.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850031
ATHENA
MSRP: $86.95Now: $78.00Was: $86.95A complete engine rebuild demands gasket materials that can withstand extreme temperatures and sustained pressure without compromising the integrity of your seal. The ATHENA Complete Gasket Kit eliminates the frustration of sourcing individual components...400510850031- SKU:
- 400510850031
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $86.95Now: $78.00Was: $86.95Qty in Cart: 0Quantity:Price:MSRP: $86.95Now: $78.00Was: $86.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510850030
ATHENA
MSRP: $74.95Now: $67.00Was: $74.95When rebuilding your engine, gasket failure isn't an option—it costs time and money you don't have. The ATHENA Complete Gasket Kit delivers the sealing integrity you need across extreme temperature swings and high-RPM abuse, with engineered materials...400510850030- SKU:
- 400510850030
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $74.95Now: $67.00Was: $74.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600124
ATHENA
MSRP: $20.95Now: $19.00Was: $20.95A competitive engine demands fresh gaskets before race day—and the ATHENA Top End Gasket Kit delivers the reliability you need when it matters most. Whether you're running stock compression on pump gas or stepping up to race fuel and higher boost, this...400510600124- SKU:
- 400510600124
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $20.95Now: $19.00Was: $20.95Qty in Cart: 0Quantity:Price:MSRP: $20.95Now: $19.00Was: $20.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850491
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95A complete engine rebuild demands gasket integrity that won't fail under extreme operating conditions. Athena's gasket kit delivers the material science and engineering precision needed to maintain cylinder pressure, prevent oil seepage, and ensure...400485850491- SKU:
- 400485850491
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850270
ATHENA
MSRP: $42.95Now: $39.00Was: $42.95Whether you're rebuilding a high-mileage engine or preparing for race-season duty, a complete gasket kit is non-negotiable for ensuring cylinder head integrity and preventing coolant or oil seepage under load. The ATHENA Complete Gasket Kit delivers...400485850270- SKU:
- 400485850270
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $42.95Now: $39.00Was: $42.95Qty in Cart: 0Quantity:Price:MSRP: $42.95Now: $39.00Was: $42.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850267
ATHENA
MSRP: $53.95Now: $49.00Was: $53.95Engine gasket failure leads to compression loss, coolant leaks, and catastrophic damage—but a quality gasket set prevents these costly problems before they start. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance across all...400485850267- SKU:
- 400485850267
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $53.95Now: $49.00Was: $53.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850253/1
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95A complete gasket kit is essential for any top-end or full engine rebuild, and using OEM-quality components ensures you won't compromise durability or sealing integrity. Athena's gasket sets are engineered with high-temperature materials and precision...400485850253- SKU:
- 400485850253
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $38.95Now: $35.00Was: $38.95Qty in Cart: 0Quantity:Price:MSRP: $38.95Now: $35.00Was: $38.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850251
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95A complete gasket kit is essential for any top-end rebuild or full engine overhaul—it ensures reliable sealing across all critical interfaces and prevents costly leaks that compromise performance and longevity. The ATHENA P400485850251 delivers...400485850251- SKU:
- 400485850251
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $38.95Now: $35.00Was: $38.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850125
ATHENA
MSRP: $47.95Now: $43.00Was: $47.95Engine gasket degradation is one of the most common failure points in high-mileage builds, leading to compression loss, fluid leakage, and catastrophic engine damage if left unaddressed. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across...400485850125- SKU:
- 400485850125
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $47.95Now: $43.00Was: $47.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850116
ATHENA
MSRP: $46.95Now: $42.00Was: $46.95A complete engine rebuild demands gasket integrity that won't compromise under extreme combustion pressures and temperature swings. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance across your top-end and complete engine...400485850116- SKU:
- 400485850116
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $46.95Now: $42.00Was: $46.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850089
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Engine gasket failure doesn't just cost you performance—it costs you reliability. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across your entire top-end and engine rebuild, using proven materials engineered to withstand extreme...400485850089- SKU:
- 400485850089
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850004
ATHENA
MSRP: $16.95Now: $15.00Was: $16.95When rebuilding your engine, gasket quality directly impacts seal integrity and longevity under extreme conditions. Athena's complete gasket kit eliminates the guesswork of sourcing individual components, delivering OEM-equivalent sealing with materials...400485850004- SKU:
- 400485850004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $16.95Now: $15.00Was: $16.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600267
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95Engine refresh cycles are critical moments in racing—and the ATHENA Top End Gasket Kit is engineered to give you flexibility without compromise. Whether you're running stock compression on pump gas or stepping up to race fuel and higher boost, this kit...400485600267- SKU:
- 400485600267
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600254
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95Engine reliability directly impacts race day performance, and a compromised top end gasket kit can cost you valuable track time or worse—a DNF. The ATHENA Top End Gasket Kit (P400485600254) is engineered specifically for Yamaha platforms and lets you...400485600254- SKU:
- 400485600254
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $33.95Now: $31.00Was: $33.95
