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
PROX Top End Gasket Set - Kawasaki/Suzuki 35.4334
PROX
MSRP: $59.95Now: $51.00Was: $59.95PROX Top End Gasket Set - Kawasaki/Suzuki09345766- SKU:
- 09345766
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
MSRP: $59.95Now: $51.00Was: $59.95 -
On Sale
VERTEX Piston Kit - High Compression 24123A
VERTEX
MSRP: $260.95Now: $234.86Was: $260.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09104100- SKU:
- 09104100
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
MSRP: $260.95Now: $234.86Was: $260.95Qty in Cart: 0Quantity:Price:MSRP: $260.95Now: $234.86Was: $260.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 24112A
VERTEX
MSRP: $327.95Now: $295.16Was: $327.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09104113- SKU:
- 09104113
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- PISTON DIAMETER METRIC:
- 94.95 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
MSRP: $327.95Now: $295.16Was: $327.95 -
On Sale
VERTEX Piston Kit VTK22995B
VERTEX
MSRP: $197.95Now: $178.16Was: $197.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103020- SKU:
- 09103020
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.93 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
MSRP: $197.95Now: $178.16Was: $197.95Qty in Cart: 0Quantity:Price:MSRP: $197.95Now: $178.16Was: $197.95Subtotal: -
On Sale
VERTEX Piston Ring 590277000005
VERTEX
MSRP: $81.95Now: $73.76Was: $81.95Replacement ring set for Vertex piston kit09120634- SKU:
- 09120634
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- FORGED REPLICA
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
MSRP: $81.95Now: $73.76Was: $81.95Qty in Cart: 0Quantity:Price:MSRP: $81.95Now: $73.76Was: $81.95Subtotal: -
On Sale
VERTEX Piston Ring - Lower 55910005800
VERTEX
MSRP: $44.95Now: $40.46Was: $44.95Replacement ring set for Vertex piston kit09120636- SKU:
- 09120636
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
MSRP: $44.95Now: $40.46Was: $44.95 -
On Sale
VERTEX Ring Set 590280000002
VERTEX
MSRP: $99.95Now: $89.96Was: $99.95Replacement piston rings, Nitride coated or chrome plated, increasing wear resistance and extending durability, The latest generation for both two-stroke and four-stroke engines; four-stroke piston rings are sold in sets and two-stroke piston rings are...09120214- SKU:
- 09120214
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- PISTON DIAMETER METRIC:
- 79.96 MM
- RIDING STYLE:
- OFF-ROAD
MSRP: $99.95Now: $89.96Was: $99.95 -
On Sale
VERTEX Ring Set 590295000002
VERTEX
MSRP: $59.95Now: $53.96Was: $59.95Replacement piston rings, Nitride coated or chrome plated, increasing wear resistance and extending durability, The latest generation for both two-stroke and four-stroke engines; four-stroke piston rings are sold in sets and two-stroke piston rings are...09120217- SKU:
- 09120217
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON DIAMETER METRIC:
- 94.95 MM
- RIDING STYLE:
- STREET
MSRP: $59.95Now: $53.96Was: $59.95 -
On Sale
VERTEX Ring Set 590295500001
VERTEX
MSRP: $80.95Now: $72.86Was: $80.95Replacement piston rings, Nitride coated or chrome plated, increasing wear resistance and extending durability, The latest generation for both two-stroke and four-stroke engines; four-stroke piston rings are sold in sets and two-stroke piston rings are...09120218- SKU:
- 09120218
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- UNITS:
- SET
- PISTON DIAMETER METRIC:
- 95.45 MM
MSRP: $80.95Now: $72.86Was: $80.95 -
On Sale
VERTEX Ring Set 590296000001
VERTEX
MSRP: $82.95Now: $74.66Was: $82.95Replacement piston rings, Nitride coated or chrome plated, increasing wear resistance and extending durability, The latest generation for both two-stroke and four-stroke engines; four-stroke piston rings are sold in sets and two-stroke piston rings are...09120219- SKU:
- 09120219
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PISTON DIAMETER METRIC:
- 95.96 MM
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
MSRP: $82.95Now: $74.66Was: $82.95 -
On Sale
VERTEX Piston Kit 23335A
VERTEX
MSRP: $197.95Now: $178.16Was: $197.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09100967- SKU:
- 09100967
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +4,00 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST BIG BORE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 57.95 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $197.95Now: $178.16Was: $197.95 -
On Sale
VERTEX Piston Kit 22951A
VERTEX
MSRP: $262.95Now: $236.66Was: $262.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09100978- SKU:
- 09100978
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
MSRP: $262.95Now: $236.66Was: $262.95Qty in Cart: 0Quantity:Price:MSRP: $262.95Now: $236.66Was: $262.95Subtotal: -
On Sale
VERTEX Piston Kit 24275B
VERTEX
MSRP: $322.95Now: $290.66Was: $322.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105132- SKU:
- 09105132
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 78.97 MM
- CYLINDER DIAMETER METRIC:
- 79 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- GP RACER'S CHOICE
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $322.95Now: $290.66Was: $322.95Qty in Cart: 0Quantity:Price:MSRP: $322.95Now: $290.66Was: $322.95Subtotal: -
On Sale
VERTEX Piston Kit 24196A
VERTEX
MSRP: $271.95Now: $244.76Was: $271.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105140- SKU:
- 09105140
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $271.95Now: $244.76Was: $271.95Qty in Cart: 0Quantity:Price:MSRP: $271.95Now: $244.76Was: $271.95Subtotal: -
On Sale
VERTEX Piston Kit 24196B
VERTEX
MSRP: $302.95Now: $272.66Was: $302.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09105141- SKU:
- 09105141
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $302.95Now: $272.66Was: $302.95Qty in Cart: 0Quantity:Price:MSRP: $302.95Now: $272.66Was: $302.95Subtotal: -
On Sale
VERTEX Piston Kit VTKTC22805A
VERTEX
MSRP: $315.95Now: $284.36Was: $315.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103703- SKU:
- 09103703
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
MSRP: $315.95Now: $284.36Was: $315.95Qty in Cart: 0Quantity:Price:MSRP: $315.95Now: $284.36Was: $315.95Subtotal: -
On Sale
VERTEX Piston Kit VTKTC22805B
VERTEX
MSRP: $315.95Now: $284.36Was: $315.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103704- SKU:
- 09103704
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
MSRP: $315.95Now: $284.36Was: $315.95 -
On Sale
VERTEX Piston Kit - High Compression VTKTC22900B
VERTEX
MSRP: $388.95Now: $350.06Was: $388.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09103709- SKU:
- 09103709
- Availability:
- Ships Same Business Day
- Weight:
- 2.45 LBS
MSRP: $388.95Now: $350.06Was: $388.95 -
On Sale
VERTEX Piston Kit 23265A
VERTEX
MSRP: $170.95Now: $153.86Was: $170.95All pistons are heat-treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life09102554- SKU:
- 09102554
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
MSRP: $170.95Now: $153.86Was: $170.95 -
On Sale
VERTEX Piston Kit 22481AB
VERTEX
MSRP: $98.95Now: $89.06Was: $98.95All pistons are heat treated with a T-5 hardening and tempering cycle, All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Cast piston kits are gravity cast aluminum alloy (not...09102234- SKU:
- 09102234
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 65 CC
- PISTON DIAMETER METRIC:
- 44.96 MM
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 45.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
MSRP: $98.95Now: $89.06Was: $98.95Qty in Cart: 0Quantity:Price:MSRP: $98.95Now: $89.06Was: $98.95Subtotal:
