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 8159
HOT RODS
$151.95If you're building or rebuilding a high-performance engine, your connecting rods carry the full force of combustion thousands of times per minute. The HOT RODS 8159 is engineered to handle sustained high-rpm loads without failure, using certified...CR177- SKU:
- CR177
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
$151.95Qty in Cart: 0Quantity:Price:$151.95Subtotal: -
HOT RODS Connecting Rod 8143
HOT RODS
$151.95When you're pushing your engine to the limit, your connecting rods need to handle sustained high-rpm stress without compromise. The HOT RODS 8143 is built for serious performance with heavy-duty 8620 AISI steel construction and precision engineering that...CR174- SKU:
- CR174
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- ENGINE TYPE:
- 2-CYCLE
$151.95 -
HOT RODS Connecting Rod 8147
HOT RODS
$138.95If you're building or rebuilding a high-performance engine, your connecting rods are the critical link between your crankshaft and pistons—and they're operating under extreme stress at every revolution. The HOT RODS 8147 Connecting Rod is engineered to...CR171- SKU:
- CR171
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- ENGINE TYPE:
- 2-CYCLE
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$138.95 -
HOT RODS Connecting Rod 8139
HOT RODS
$165.95Whether you're building a high-rpm engine or replacing worn OE rods, the HOT RODS 8139 Connecting Rod delivers the strength and precision required for sustained performance under extreme conditions. The 8620 AISI steel construction paired with...CR166- SKU:
- CR166
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- ENGINE TYPE:
- 2-CYCLE
- PRODUCT NAME:
- CONNECTING ROD KIT
$165.95 -
HOT RODS Connecting Rod 8140
HOT RODS
$162.95When you're pushing your engine to its limits, a stock connecting rod becomes a liability. The HOT RODS 8140 Connecting Rod is engineered to handle the extreme pressures and RPM loads that separate reliable performance builds from catastrophic failures...CR165- SKU:
- CR165
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- ENGINE TYPE:
- 2-CYCLE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
$162.95 -
HOT RODS Connecting Rod 8148
HOT RODS
$189.95When you're pushing your engine to its limits, your connecting rods need to handle sustained high-RPM loads without compromise. The HOT RODS 8148 Connecting Rod delivers the strength and precision required for serious performance builds, whether you're...CR164- SKU:
- CR164
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
$189.95 -
HOT RODS Connecting Rod 8141
HOT RODS
$147.95When you're pushing your engine to its limits, your connecting rods are doing the heavy lifting—literally. A failure in this critical component means catastrophic engine damage and lost race time. The HOT RODS 8141 Connecting Rod delivers the strength...CR161- SKU:
- CR161
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
$147.95 -
COMETIC Top End Gasket Set - YZ250 C7855
COMETIC
$47.95A degraded top end gasket set compromises combustion chamber sealing, leading to compression loss and power leaks—especially critical on high-revving 2-strokes where ring seal directly impacts performance. The COMETIC C7855 YZ250 gasket set uses...C7855- SKU:
- C7855
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$47.95Qty in Cart: 0Quantity:Price:$47.95Subtotal: -
COMETIC Top End Gasket Set - Kawasaki C7392
COMETIC
$44.95A failed top-end gasket will cost you more than money—it'll cost you race days and reliability. The COMETIC C7392 gasket set is engineered with multi-layered steel construction and proprietary Viton rubber coating to handle the extreme combustion...C7392- SKU:
- C7392
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 53.00 MM
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
$44.95 -
COMETIC Gasket Set - XR400 C7279
COMETIC
$40.95A quality gasket set is non-negotiable for top-end reliability, especially when you're pushing your XR400 to higher outputs. The COMETIC C7279 keeps combustion pressures sealed and heat managed, preventing catastrophic failures between rebuilds. This is...C7279- SKU:
- C7279
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 86.00 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$40.95 -
COMETIC Gasket Set - TT600 C7213
COMETIC
$36.95High-output engines demand gasket integrity that matches their power output—and standard gaskets simply can't keep up with modern boost levels and cylinder pressures. The COMETIC Gasket Set TT600 C7213 uses multi-layered steel construction with Viton...C7213- SKU:
- C7213
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE METRIC:
- 97.00 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
COMETIC Top End Gasket Set - Honda C7116
COMETIC
$47.95A quality top-end gasket set is non-negotiable for any engine rebuild or performance upgrade—gasket failure under high boost or sustained high RPM will compromise compression, leak coolant, and cost you far more in downtime than prevention. COMETIC's...C7116- SKU:
- C7116
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE METRIC:
- 68.50 MM
- THICKNESS IMPERIAL:
- 0,012'
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$47.95Qty in Cart: 0Quantity:Price:$47.95Subtotal: -
COMETIC Top End Gasket Set - Kawasaki C7047
COMETIC
$52.95A failing top-end gasket set compromises combustion chamber sealing, reduces ring seal effectiveness, and invites catastrophic engine damage. The COMETIC C7047 eliminates these risks with multi-layered steel construction and advanced sealing technology...C7047- SKU:
- C7047
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 88.00 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$52.95 -
COMETIC Top End Gasket Set - Honda C7020
COMETIC
$51.95A compromised top end gasket is a silent killer of engine performance and reliability. The COMETIC C7020 gasket set eliminates the guesswork with precision-engineered components designed to handle high-output naturally aspirated and forced induction...C7020- SKU:
- C7020
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- THICKNESS IMPERIAL:
- 0,012'
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 91.00 MM
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.31 MM
$51.95 -
Hinson Racing Clutch Cover for Honda CRF450R 2002-2008 C224
HINSON RACING
$159.99Stock clutch covers overheat under sustained throttle, robbing you of reliable engagement when it matters most. The Hinson Racing Clutch Cover solves this with optimized cooling geometry and reinforced construction that handles the demands of competitive...C154- SKU:
- C154
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- MODEL:
- BILLETPROOF
$159.99 -
Wiseco Piston Kit 48mm Bore 2002-2023 Suzuki RM85 806M04800
WISECO
$132.95The Wiseco 806M04800 piston kit delivers the durability and power output you need to stay competitive in the RM85 class, whether you're chasing podiums or pushing limits on the trail. Built from forged high-silicon aluminum, this piston withstands the...806M04800- SKU:
- 806M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- STROKE LENGTH:
- 46,80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 84.7 CC
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
$132.95 -
Wiseco Piston Standard Yamaha YZ 85 2002-2021 805M04750
WISECO
$132.95The stock piston in your YZ 85 can't keep up with the demands of competitive racing or aggressive trail riding. Wiseco's forged piston delivers the compression consistency, durability, and power output you need to stay competitive across multiple seasons...805M04750- SKU:
- 805M04750
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 47,80 MM
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 85 CC
- BORE SIZE METRIC:
- 47.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$132.95 -
Wiseco Piston Kit for Yamaha YZ 250 2002-2025 804M06640
WISECO
$171.95If you're running a Yamaha YZ 250 in competitive racing or high-performance trail riding, stock pistons won't cut it. The Wiseco 804M06640 kit delivers the strength and precision needed to handle aggressive tuning, boost horsepower, and maintain...804M06640- SKU:
- 804M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$171.95Qty in Cart: 0Quantity:Price:$171.95Subtotal: -
Wiseco Piston Kit 41.50mm KTM 50SX LC 2001-2008 803M04150
WISECO
$109.95The Wiseco Piston Kit delivers the durability and performance gains your KTM 50SX LC demands during high-RPM racing and aggressive trail riding. High-silicon aluminum construction and E-coat protection resist thermal stress and wear, while the optimized...803M04150- SKU:
- 803M04150
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- DISPLACEMENT:
- 49 CC
- STROKE LENGTH:
- 40,00 MM
- BORE SIZE METRIC:
- 41.50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 40.00 MM
- UNITS:
- EACH
$109.95 -
Wiseco 39.50mm Piston Kit for KTM 50 SX 2001-2008 803M03950
WISECO
$116.95The Wiseco 39.50mm piston kit delivers the compression ratio stability and durability your KTM 50 SX demands during sustained racing or aggressive trail riding. Built from high-silicon aluminum alloy and featuring E-coated critical surfaces, this forged...803M03950- SKU:
- 803M03950
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 40,00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 39.50 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- DISPLACEMENT:
- 49 CC
$116.95
