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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On Sale
Wossner Top End Bearing Yamaha YZ125 1997-2001 N1011
WOSSNER
MSRP: $18.50Now: $17.58Was: $18.50The Wossner Top End Bearing is a critical wear item for YZ125 top-end rebuilds—worn bearings cause excessive piston slap, reduced ring seal, and accelerated bore wear. This OEM-quality replacement...09240451- SKU:
- 09240451
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 17.8 MM
- INSIDE DIAMETER METRIC:
- 15 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- OUTSIDE DIAMETER METRIC:
- 20 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
MSRP: $18.50Now: $17.58Was: $18.50Qty in Cart: 0Quantity:Price:MSRP: $18.50Now: $17.58Was: $18.50Subtotal: -
HOT RODS Crank Bearings K012
HOT RODS
$113.95A crankshaft is only as reliable as its bearings. The HOT RODS K012 crank bearing and seal kit ensures proper load distribution, oil pressure integrity, and long-term durability when you're running a...09240034- SKU:
- 09240034
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$113.95 -
HOT RODS Crank Bearings K009
HOT RODS
$64.95Crankshaft reliability hinges on bearing quality—inadequate bearings introduce excessive clearance, accelerate wear, and compromise engine stability at high RPM. The HOT RODS K009 crank bearing and...09240031- SKU:
- 09240031
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal: -
On Sale
ATHENA Connecting Rod Kit P40321046
ATHENA
MSRP: $133.95Now: $114.00Was: $133.95The ATHENA Connecting Rod Kit P40321046 delivers the precision and durability your engine demands when power levels climb. Built to OEM material standards but engineered with high-frequency surface...09230490- SKU:
- 09230490
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 300 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- RIDING STYLE:
- STREET
MSRP: $133.95Now: $114.00Was: $133.95 -
On Sale
ATHENA Connecting Rod Kit P40321047
ATHENA
MSRP: $121.95Now: $110.00Was: $121.95The ATHENA Connecting Rod Kit P40321047 delivers the reliability and lightweight construction your engine demands when reliability cannot be compromised. High-frequency surface treatment reduces...09230488- SKU:
- 09230488
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 125 CC
- DISPLACEMENT:
- 144 CC
- UNITS:
- KIT
- DISPLACEMENT:
- 150 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $121.95Now: $110.00Was: $121.95Qty in Cart: 0Quantity:Price:MSRP: $121.95Now: $110.00Was: $121.95Subtotal: -
On Sale
ATHENA Connecting Rod Kit P40321039
ATHENA
MSRP: $103.95Now: $89.00Was: $103.95The ATHENA Connecting Rod Kit P40321039 delivers the reliability and precision your engine demands at high RPM. Built with materials engineered to match OEM specifications, these rods handle extreme...09230485- SKU:
- 09230485
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $103.95Now: $89.00Was: $103.95Qty in Cart: 0Quantity:Price:MSRP: $103.95Now: $89.00Was: $103.95Subtotal: -
HOT RODS Connecting Rod 8684
HOT RODS
$225.95If you're building or rebuilding a high-performance engine, your connecting rods need to handle extreme combustion pressures and RPM loads without failure. The HOT RODS 8684 delivers the durability...09230275- SKU:
- 09230275
- Availability:
- Ships Same Business Day
- Weight:
- 1.74 LBS
- MATERIAL:
- 8620 STEEL
- ENGINE TYPE:
- 4-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$225.95Qty in Cart: 0Quantity:Price:$225.95Subtotal: -
HOT RODS Connecting Rod 8669
HOT RODS
$151.95Whether you're rebuilding a high-revving engine or replacing worn OE rods, the HOT RODS Connecting Rod 8669 delivers the strength and precision required for sustained performance. Built from...09230226- SKU:
- 09230226
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$151.95Qty in Cart: 0Quantity:Price:$151.95Subtotal: -
HOT RODS Crankshaft Kit 4416
HOT RODS
$489.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft Kit 4416 eliminates the guesswork and machine work typically required for displacement increases. This complete assembly...09210516- SKU:
- 09210516
- Availability:
- Ships Same Business Day
- Weight:
- 6.95 LBS
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 53.60 MM
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 4-CYCLE
- TYPE:
- OEM STROKE
$489.95 -
VERTEX Wrist Pin 715036
VERTEX
$4.95Wrist pin longevity directly impacts engine reliability and rebuild intervals. The VERTEX 715036 utilizes case-hardened nitride coating technology to deliver exceptional wear resistance without the...09130103- SKU:
- 09130103
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- UNITS:
- EACH
$4.95Qty in Cart: 0Quantity:Price:$4.95Subtotal: -
On Sale
ATHENA Piston Ring Set S41316209
ATHENA
MSRP: $35.95Now: $29.00Was: $35.95Piston rings are critical to engine sealing and compression retention—worn or damaged rings lead to blow-by, power loss, and accelerated wear on cylinder walls. The ATHENA Piston Ring Set S41316209...09120434- SKU:
- 09120434
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- UNITS:
- SET
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 52.96 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
MSRP: $35.95Now: $29.00Was: $35.95 -
VERTEX Piston Ring 590276800001
VERTEX
$76.95Piston ring wear is one of the leading causes of power loss and compression failure in both two-stroke and four-stroke engines. The VERTEX Piston Ring 590276800001 replaces worn rings with...09120386- SKU:
- 09120386
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- BORE SIZE METRIC:
- 76.80 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- PISTON DIAMETER METRIC:
- 77.95 MM
- UNITS:
- SET
$76.95Qty in Cart: 0Quantity:Price:$76.95Subtotal: -
VERTEX Piston Ring 590397000003
VERTEX
$80.95Piston ring degradation is one of the most common causes of compression loss and oil consumption in high-mileage or high-performance engines. VERTEX piston rings are engineered to restore proper ring...09120352- SKU:
- 09120352
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$80.95Qty in Cart: 0Quantity:Price:$80.95Subtotal: -
JE PISTONS Piston Kit 323898
JE PISTONS
$329.99If you're building a competition engine that demands absolute reliability under extreme pressure, JE Pistons' Pro Series kit delivers the precision engineering required to survive repeated high-RPM...09105934- SKU:
- 09105934
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE SIZE METRIC:
- 95.00 MM
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- PISTON HEAD SHAPE:
- DOMED
- STYLE:
- JE PISTON
- TYPE:
- FORGED SIDE RELIEF DESIGN
- UNITS:
- KIT
$329.99Qty in Cart: 0Quantity:Price:$329.99Subtotal: -
On Sale
Wossner Piston Kit KTM 65 SX 2000-2008 8198DA
WOSSNER
MSRP: $102.00Now: $96.90Was: $102.00The KTM 65 SX demands a piston engineered to handle the demands of 2-stroke racing. Wossner's 8198DA kit delivers the durability and precision needed to maintain peak performance across seasons of...09105573- SKU:
- 09105573
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 44.96 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 64 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- SINGLE RING
- UNITS:
- KIT
MSRP: $102.00Now: $96.90Was: $102.00Qty in Cart: 0Quantity:Price:MSRP: $102.00Now: $96.90Was: $102.00Subtotal: -
VERTEX Piston Kit 24142B
VERTEX
$303.95Whether you're rebuilding a tired engine or upgrading to higher compression, the VERTEX Piston Kit 24142B delivers the durability and precision you need to maximize power and reliability. These...09105187- SKU:
- 09105187
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.4:1
- PISTON DIAMETER METRIC:
- 80.97 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 81.00 MM
- DISPLACEMENT:
- 270 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +3.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
$303.95Qty in Cart: 0Quantity:Price:$303.95Subtotal: -
VERTEX Piston Kit 24267A
VERTEX
$237.95The VERTEX Piston Kit 24267A delivers the durability and performance consistency your engine demands, whether you're rebuilding a stock platform or maximizing output on a high-performance build...09105174- SKU:
- 09105174
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$237.95Qty in Cart: 0Quantity:Price:$237.95Subtotal: -
VERTEX Piston Kit 24244B
VERTEX
$254.95The VERTEX Piston Kit 24244B delivers the durability and precision your engine demands, whether you're chasing lap times or building a reliable rebuild. Engineered with industry-leading materials and...09105168- SKU:
- 09105168
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PISTON DIAMETER METRIC:
- 71.935 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 300 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$254.95 -
On Sale
Wossner 75.98mm Piston Kit for 2006-2012 KTM 250 SX-F 8645DC
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00When you're pushing your KTM 250 SX-F to the limit, your piston has to handle extreme combustion pressures and sustained high RPMs without compromise. The Wossner 8645DC is engineered to deliver the...09104958- SKU:
- 09104958
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 76.02 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,02 MM
- BORE - OVERSIZE METRIC:
- +0.02 MM
- MODEL:
- PREMIUM SERIES
- PISTON SIZE METRIC:
- 75.98 MM
- PRODUCT NAME:
- PISTON KIT
MSRP: $204.00Now: $193.80Was: $204.00Qty in Cart: 0Quantity:Price:MSRP: $204.00Now: $193.80Was: $204.00Subtotal: -
On Sale
Wossner Piston Kit 53.97mm for Husqvarna CR125 1998-2013 8089DC
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00If you're running a Husqvarna CR125 at the track or trail, piston wear is inevitable—and a failing piston compromises both reliability and power delivery. The Wossner 8089DC replaces worn internals...09104814- SKU:
- 09104814
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 54.02 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 124 CC
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 53.97 MM
MSRP: $142.00Now: $134.90Was: $142.00Qty in Cart: 0Quantity:Price:MSRP: $142.00Now: $134.90Was: $142.00Subtotal:
