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
Wiseco Crankshaft Kit for 1992-2001 Kawasaki KX250 WPC128B
WISECO
MSRP: $479.95Now: $408.00Was: $479.95The WISECO WPC128B Crankshaft Assembly is engineered for maximum performance and reliability. This all-in-one solution includes a top-end bearing, premium main bearings, and a comprehensive bottom-end gasket set, ensuring that you have everything needed...09210109- SKU:
- 09210109
- Availability:
- Ships Same Business Day
- Weight:
- 12.51 LBS
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
MSRP: $479.95Now: $408.00Was: $479.95 -
On Sale
Wiseco KX100 1995-2013 Ring Set 2067CD
WISECO
MSRP: $49.95Now: $42.00Was: $49.95Enhance your engine's performance with the WISECO Ring Set 2067CD, designed for precision and durability. Each set is tailored for a single piston, ensuring optimal fit and function for your high-performance needs. Experience improved sealing and reduced...2067CD- SKU:
- 2067CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 99 CC
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
MSRP: $49.95Now: $42.00Was: $49.95 -
On Sale
Wiseco Piston Ring Set 58mm Bore for Yamaha YZ125 1976-1988 2005-2021 2020-2022 YZ125X 2284CS
WISECO
MSRP: $24.95Now: $21.00Was: $24.95The WISECO Ring Set 2284CS is designed for optimal performance and durability in high-performance engines. This replacement ring set ensures a perfect fit for your pistons, enhancing compression and efficiency. Engineered for reliability, it meets the...2284CS- SKU:
- 2284CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 58.00 MM
- DISPLACEMENT:
- 125 CC
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
MSRP: $24.95Now: $21.00Was: $24.95Qty in Cart: 0Quantity:Price:MSRP: $24.95Now: $21.00Was: $24.95Subtotal: -
On Sale
Wiseco Piston Honda CRF450R 2002-2008 338M07050
WISECO
MSRP: $199.95Now: $170.00Was: $199.95Wiseco 338M07050 Piston Kit Elevate your dirt bike or ATV's performance with the Wiseco 338M07050 Piston Kit, meticulously designed for high-performance 2-stroke engines. This premium piston kit promises exceptional durability and reliability, ensuring...338M07050- SKU:
- 338M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.40 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 248 CC
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- 70.50 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.45 MM
- SKIRT COATING:
- NON-COATED
MSRP: $199.95Now: $170.00Was: $199.95 -
On Sale
Wiseco Piston Kit Honda CR125M 1974-1978 1.0mm 339M05700
WISECO
MSRP: $154.95Now: $132.00Was: $154.95Wiseco 339M05700 Piston Kit Elevate your riding experience with the Wiseco 339M05700 Piston Kit, meticulously engineered for 2-stroke engines. This kit promises unmatched performance and reliability, making it the perfect upgrade for both racing...339M05700- SKU:
- 339M05700
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 57.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.94 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 50.00 MM
MSRP: $154.95Now: $132.00Was: $154.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 150 SX 2014-2015 WR101-173
WRENCH RABBIT
$1,092.95Revitalize your KTM engine with the WRENCH RABBIT Engine Kit, a comprehensive solution that includes everything you need for a professional-grade rebuild. Designed for enthusiasts and professionals alike, this kit ensures optimal performance and...09031313- SKU:
- 09031313
- Availability:
- Ships Same Business Day
- Weight:
- 10.70 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,092.95Qty in Cart: 0Quantity:Price:$1,092.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-827-12
WSM
$229.87Top-quality piston kits, Include pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gaskets09030124- SKU:
- 09030124
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 81.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
$229.87Qty in Cart: 0Quantity:Price:$229.87Subtotal: -
Hinson Racing Clutch Cover Suzuki RM-Z450 2008-2025 C330
HINSON RACING
$169.99Elevate your performance with the HINSON RACING Clutch Cover for the RMZ450 C330. Designed for serious racers, this clutch cover enhances heat dissipation and durability, ensuring that your bike performs at its best under the most demanding conditions...09400816- SKU:
- 09400816
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- PRODUCT NAME:
- COVER
- MATERIAL:
- T-6 ALUMINUM
- TYPE:
- CLUTCH
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
$169.99Qty in Cart: 0Quantity:Price:$169.99Subtotal: -
Hinson Racing Clutch Cover Kawasaki KX250F 2009-2018 C357
HINSON RACING
$169.99Elevate your bike's performance with the HINSON RACING Clutch Cover, specifically designed for the KX250F. This premium cover enhances heat dissipation and durability, ensuring optimal performance on the track. Experience the difference with a product...09400817- SKU:
- 09400817
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
$169.99Qty in Cart: 0Quantity:Price:$169.99Subtotal: -
Hinson Racing Clutch Cover for Kawasaki KX450F 2006-2015 C263
HINSON RACING
$169.99Elevate your KX450F's performance with the Hinson Racing Clutch Cover, designed for superior heat dissipation and unmatched durability. Engineered for racers, this clutch cover offers enhanced strength over stock components, ensuring reliability on the...09400825- SKU:
- 09400825
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
$169.99Qty in Cart: 0Quantity:Price:$169.99Subtotal: -
Hinson Racing Clutch Cover CRF250R 2010-2016 C494
HINSON RACING
$199.99Enhance your racing performance with the HINSON RACING Clutch Cover C494, designed for superior heat dissipation and durability. Manufactured in the U.S.A., this clutch cover outperforms stock options, ensuring reliability on the track. Experience the...09400980- SKU:
- 09400980
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MATERIAL:
- T-6 ALUMINUM
- TYPE:
- CLUTCH
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
$199.99Qty in Cart: 0Quantity:Price:$199.99Subtotal: -
Rekluse Clutch Cover Yamaha YZ125 2005-2025 RMS-392
REKLUSE
$189.00Experience superior performance and unmatched durability with the REKLUSE Clutch Cover for YZ125. Designed for the adventurous rider, this high-quality component stands resilient against the toughest terrains, ensuring your bike is always ready to...09401820- SKU:
- 09401820
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$189.00Qty in Cart: 0Quantity:Price:$189.00Subtotal: -
Rekluse Clutch Cover Suzuki RM-Z250 2007-2025 RMS-467
REKLUSE
$189.00Enhance your riding experience with the REKLUSE Clutch Cover RMZ250 RMS-467, crafted for exceptional strength and performance. This premium component is designed to withstand the toughest conditions, ensuring your bike is ready for any challenge. With...09401832- SKU:
- 09401832
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$189.00Qty in Cart: 0Quantity:Price:$189.00Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 24116B
VERTEX
MSRP: $296.95Now: $267.26Was: $296.95All 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 life09104118- SKU:
- 09104118
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 88.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 87.97 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- 15.1:1
- DISPLACEMENT:
- 350 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
MSRP: $296.95Now: $267.26Was: $296.95Qty in Cart: 0Quantity:Price:MSRP: $296.95Now: $267.26Was: $296.95Subtotal: -
On Sale
VERTEX Piston Kit 24105B
VERTEX
MSRP: $71.95Now: $64.76Was: $71.95All 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 life09104135- SKU:
- 09104135
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- CYLINDER DIAMETER METRIC:
- 39.00 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 38.95 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 50 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $71.95Now: $64.76Was: $71.95Qty in Cart: 0Quantity:Price:MSRP: $71.95Now: $64.76Was: $71.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 23960B
VERTEX
MSRP: $301.95Now: $271.76Was: $301.95All 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 life09103403- SKU:
- 09103403
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 96.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
MSRP: $301.95Now: $271.76Was: $301.95Qty in Cart: 0Quantity:Price:MSRP: $301.95Now: $271.76Was: $301.95Subtotal: -
On Sale
VERTEX Piston Kit 23961A
VERTEX
MSRP: $235.95Now: $212.36Was: $235.95All 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 life09103405- SKU:
- 09103405
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
MSRP: $235.95Now: $212.36Was: $235.95Qty in Cart: 0Quantity:Price:MSRP: $235.95Now: $212.36Was: $235.95Subtotal: -
On Sale
VERTEX Piston Kit - High Compression 23963A
VERTEX
MSRP: $335.95Now: $302.36Was: $335.95All 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 life09103411- SKU:
- 09103411
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- PISTON DIAMETER METRIC:
- 76.76 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.6:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $335.95Now: $302.36Was: $335.95Qty in Cart: 0Quantity:Price:MSRP: $335.95Now: $302.36Was: $335.95Subtotal: -
On Sale
VERTEX Piston Kit 24273A
VERTEX
MSRP: $218.95Now: $197.06Was: $218.95All 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...09105128- SKU:
- 09105128
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $218.95Now: $197.06Was: $218.95Qty in Cart: 0Quantity:Price:MSRP: $218.95Now: $197.06Was: $218.95Subtotal: -
On Sale
VERTEX Piston Kit 24273B
VERTEX
MSRP: $242.95Now: $218.66Was: $242.95All 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...09105129- SKU:
- 09105129
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
MSRP: $242.95Now: $218.66Was: $242.95Qty in Cart: 0Quantity:Price:MSRP: $242.95Now: $218.66Was: $242.95Subtotal:
