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
-
Wiseco Piston Kit Kawasaki KX85 2001-2008 782M04950
WISECO
$143.95A worn or stock piston can limit your KX85's potential—costing you throttle response, reliability, and track performance. Wiseco's precision-engineered piston kit restores the efficiency your engine demands, with lightweight construction and superior...09101238- SKU:
- 09101238
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE SIZE METRIC:
- 49.50 MM
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$143.95 -
Wiseco Piston Kit 89mm Honda CR500R 1984-2001 871M08900
WISECO
$238.95The Wiseco 89mm piston kit is engineered for the demanding demands of CR500R racing and high-rpm recreational riding. This precision-machined piston maintains stock bore diameter while delivering the durability and thermal stability required for...09102022- SKU:
- 09102022
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 89.00 MM
- DISPLACEMENT:
- 472 CC
- STROKE LENGTH METRIC:
- 76.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- EACH
$238.95 -
Wiseco Suzuki RM125 2004-2007 Piston Kit with Gaskets PK1377
WISECO
$234.95The Wiseco Suzuki RM125 piston kit is engineered for riders who demand reliable top-end performance in competitive or high-mileage conditions. High-silicone forged aluminum construction delivers the strength and thermal stability necessary for sustained...09030531- SKU:
- 09030531
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$234.95 -
Wiseco 72mm Piston Kit for 2005-2007 KTM 300 EXC PK1409
WISECO
$297.95Your KTM 300 EXC's top-end demands precision engineering to handle the demands of 2-stroke racing and trail riding. The Wiseco 72mm Piston Kit delivers exactly that—a complete rebuild solution engineered to withstand sustained high temperatures while...09030534- SKU:
- 09030534
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- DISPLACEMENT:
- 297 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 73.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 71.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$297.95 -
Wiseco Piston Kit Yamaha PW50 1981-2025 653M04200
WISECO
$116.95The Wiseco Piston Kit for your Yamaha PW50 delivers the precision engineering your engine needs to maintain consistent performance across 45+ years of production. Whether you're rebuilding after high hours or upgrading a stock engine, this kit ensures...09102871- SKU:
- 09102871
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 42.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 39.20 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 54 CC
$116.95Qty in Cart: 0Quantity:Price:$116.95Subtotal: -
Wiseco Piston Kit Standard Bore 64.5mm Yamaha RT180 1990-1998 772M06450
WISECO
$162.95If you're rebuilding or refreshing your RT180 engine, piston quality directly impacts compression, reliability, and throttle response. Wiseco's forged aluminum construction delivers the strength needed for consistent performance, whether you're running...09102875- SKU:
- 09102875
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 176 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$162.95Qty in Cart: 0Quantity:Price:$162.95Subtotal: -
Wiseco Yamaha RT180 1990-1998 Piston Kit 772M06550
WISECO
$154.95The Wiseco piston kit for your Yamaha RT180 directly addresses wear and performance loss in the combustion chamber. A worn or damaged piston compromises compression, throttle response, and fuel efficiency—upgrading to Wiseco's precision-engineered design...09102877- SKU:
- 09102877
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 65.50 MM
- DISPLACEMENT:
- 182 CC
- STROKE LENGTH METRIC:
- 54.00 MM
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit 47.00mm Bore KTM 65 SX 2009-2021 864M04700
WISECO
$134.95If you're running a KTM 65 SX hard on the track or trail, piston durability and thermal stability are non-negotiable. The Wiseco 864M04700 is precision-forged from high-silicon alloy to handle the sustained RPMs and combustion pressures of competitive...09102881- SKU:
- 09102881
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 47.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 70 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 40.80 MM
- UNITS:
- EACH
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 54mm Standard 2014-2020 KTM 125 SX 868M05400
WISECO
$199.95A quality piston kit is the foundation of engine reliability—especially in high-revving two-stroke competition engines like the KTM 125 SX. The Wiseco 54mm Standard Piston Kit delivers the precision fitment and durability required for consistent power...09102882- SKU:
- 09102882
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 54.00 MM
- RIDING STYLE:
- STREET
$199.95 -
Wiseco Piston Kit 92mm 12.5:1 Compression for 1998-2000 Yamaha WR400F 1998-1999 Yamaha YZ400F 4649M09200
WISECO
$239.95When your WR400F or YZ400F is pushing peak RPMs on the track or trail, your piston needs to handle compression spikes and sustained heat without compromise. The Wiseco 4649M09200 delivers the durability and precision engineering that separates reliable...4649M09200- SKU:
- 4649M09200
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 91.92 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 92 MM
- DISPLACEMENT:
- 399 CC
- STROKE LENGTH METRIC:
- 60.10 MM
$239.95 -
Wiseco Piston Kit 78mm 11:1 Compression Kawasaki KLX300R 1997-2006 4630M07800
WISECO
$194.95A worn or damaged piston directly impacts engine efficiency, throttle response, and overall reliability—especially if you're pushing your KLX300R on the trail or at the track. The Wiseco 4630M07800 delivers the precision and durability you need to...4630M07800- SKU:
- 4630M07800
- Availability:
- Ships Same Business Day
- Weight:
- 0.74 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- DISPLACEMENT:
- 292 CC
- PISTON DIAMETER METRIC:
- 77.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 61.20 MM
$194.95Qty in Cart: 0Quantity:Price:$194.95Subtotal: -
Wiseco Piston Kit 54mm 11:1 Compression for Yamaha TT-R125 2000-2009 4752M05400
WISECO
$160.95If you're pushing your TT-R125 hard on the trail or in competition, your stock piston won't cut it. The Wiseco 4752M05400 delivers the strength and efficiency needed to handle sustained high-RPM abuse while maintaining reliability across both...4752M05400- SKU:
- 4752M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 53.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 54.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
$160.95 -
Wiseco Piston Kit 54.5mm 11:1 Compression for Yamaha TT-R125 2000-2009 4752M05450
WISECO
$160.95When you're pushing your TT-R125 to its limits on the trail or track, a stock piston won't cut it. The Wiseco 4752M05450 delivers the compression ratio and material science you need to unlock real power gains while maintaining the reliability that keeps...4752M05450- SKU:
- 4752M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123.7 CC
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 54.50 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 54.45 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$160.95 -
Wiseco TTR125 2000-2021 11:1 Compression Piston Kit 4752M05500
WISECO
$160.95A worn or damaged piston directly compromises engine efficiency, throttle response, and overall reliability—especially in high-demand trail and racing conditions. The Wiseco TTR125 piston kit delivers the precision engineering and material strength...4752M05500- SKU:
- 4752M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 55.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 54.95 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 54.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$160.95Qty in Cart: 0Quantity:Price:$160.95Subtotal: -
Wiseco YZ490 IT490 1982-1984 Piston Kit 478M08700
WISECO
$234.95When you're pushing a YZ490 or IT490 to its limits—whether on the trail or at the track—piston integrity becomes non-negotiable. The Wiseco 478M08700 piston kit delivers the durability and precision your engine demands, featuring a high-silicon alloy...478M08700- SKU:
- 478M08700
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE SIZE METRIC:
- 87.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 487 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 86.92 MM
- STROKE LENGTH METRIC:
- 82.00 MM
$234.95 -
Wiseco Piston Kit 98mm 9:1 Compression Honda XR600R 1985-2000 4577M09800
WISECO
$239.95When you're pushing your XR600R to its limits, factory pistons become a liability. The Wiseco 4577M09800 delivers the strength and precision your engine demands, whether you're conquering technical trail sections or competing on the track. This complete...4577M09800- SKU:
- 4577M09800
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- +1,00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON DIAMETER METRIC:
- 97.92 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 591 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STROKE LENGTH METRIC:
- 80.00 MM
- BORE SIZE METRIC:
- 98.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
$239.95 -
Wiseco Piston Kit Yamaha YZ80 1976-1980 457M05000
WISECO
$135.95A worn or damaged piston directly impacts engine compression, throttle response, and overall power delivery on your YZ80. The Wiseco 457M05000 restores factory performance specifications while offering the durability upgrades your bike needs for...457M05000- SKU:
- 457M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE SIZE METRIC:
- 50.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 49.95 MM
$135.95 -
Wiseco Piston Kit Kawasaki KX85 2014-2020 RE924M05050
WISECO
$149.95For KX85 riders demanding reliability under high RPM conditions, the Wiseco Racer Elite piston kit delivers the precision engineering needed to maintain power delivery lap after lap. Built with 2000 Series alloy and protective coatings, this kit resists...09105091- SKU:
- 09105091
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 50.50 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$149.95Qty in Cart: 0Quantity:Price:$149.95Subtotal: -
Wiseco Piston Kit 1995-2021 Kawasaki KX100 RE907M05300
WISECO
$132.64When you're pushing your KX100 to the limit, your piston has to absorb extreme combustion pressures and temperatures without compromise. The Wiseco Racer Elite Piston Kit delivers the durability and precision tolerances that separate consistent lap times...09105093- SKU:
- 09105093
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
$132.64 -
Wossner Connecting Rod Honda CR125R 1981-1984 P2040
WOSSNER
$122.00If you're rebuilding a CR125R engine, the structural integrity of your connecting rod directly impacts reliability under peak combustion loads. Wössner's 8620 forged alloy construction, refined through FEA simulation, delivers the durability needed for...09230571- SKU:
- 09230571
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
$122.00
