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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Wiseco Piston Kit 50mm 2002-2020 Suzuki RM85 RE901M05000
WISECO
$134.95The Wiseco RE901M05000 Racer Elite piston kit is engineered to deliver the durability and precision your Suzuki RM85 demands, whether you're pushing lap times or tackling demanding terrain. Factory pistons wear quickly under high RPM and aggressive...09105108- SKU:
- 09105108
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +2,00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$134.95 -
Wiseco Suzuki RM125 2004-2007 56mm Piston Kit RE914M05600
WISECO
$204.95If you're running a Suzuki RM125 at the edge of its limits, you need a piston kit engineered to handle the punishment. The Wiseco RE914M05600 Racer Elite delivers the compression, durability, and throttle response required for competitive racing and...09105112- SKU:
- 09105112
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$204.95 -
Wiseco Piston Kit Yamaha YZ85 2002-2021 47.50mm RE900M04750
WISECO
$171.95The Wiseco Piston Kit is engineered for the Yamaha YZ85 to deliver the durability and sealing performance required in high-demand 2-stroke racing environments. Whether you're rebuilding after a season or maximizing power output, this kit combines premium...09105116- SKU:
- 09105116
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$171.95 -
Wiseco YZ125 2005-2020 Racer Elite Piston Kit RE905M05600
WISECO
$204.95The YZ125 demands a piston that can handle sustained high RPM racing without compromise. Wiseco's Racer Elite kit delivers the precision fitment and durability required for consistent top-end performance, whether you're chasing podiums or pushing your...09105121- SKU:
- 09105121
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$204.95 -
Wiseco Piston Kit with Gaskets 40mm Bore for Yamaha PW50 1981-2025 PK1157
WISECO
$171.95A worn or damaged piston directly throttles your PW50's performance, causing compression loss, poor throttle response, and accelerated engine wear. The Wiseco PK1157 restores full compression integrity and thermal efficiency with precision-forged...09030275- SKU:
- 09030275
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 40.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.20 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- RACER'S CHOICE
$171.95 -
Wiseco 54mm Piston Kit with Gaskets for 2003 Honda CR125R PK1265
WISECO
$243.95A worn or damaged piston directly compromises your CR125R's compression, throttle response, and fuel efficiency. This complete Wiseco kit eliminates guesswork with OEM-spec fitment and quality gaskets, getting your bike back to peak performance without...09030286- SKU:
- 09030286
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
$243.95 -
Wiseco Piston Kit with Gaskets for 1993-1998 Suzuki RMX250 PK1339
WISECO
$277.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and overall engine reliability—especially critical on a 2-stroke like the RMX250 where every combustion cycle demands precision. The Wiseco PK1339 Pro-Lite kit...09030287- SKU:
- 09030287
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.94 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 246 CC
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 70.80 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 67.00 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$277.95 -
Wiseco Yamaha YZ125 2001 54mm Piston Kit PK1348
WISECO
$225.95If you're running a 2001 YZ125 and want to maximize power output without sacrificing reliability, a quality piston kit is non-negotiable. The Wiseco PK1348 delivers the precision engineering and lightweight construction that separates competitive riders...09030288- SKU:
- 09030288
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 53.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$225.95 -
Wiseco Piston Kit 71mm Oversize for Honda CR250R 1978-1980 431M07100
WISECO
$221.95If you're running a Honda CR250R with high mileage or planning a performance build, a quality piston kit is essential to restore compression and unlock the engine's full potential. Wiseco's forged construction and CNC precision ensure reliable power...431M07100- SKU:
- 431M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- DISPLACEMENT:
- 248 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 70.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.40 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 71.00 MM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
$221.95 -
Wiseco 85mm Piston Kit for 1983-1984 Honda XR350R 4286M08500
WISECO
$184.95If you're running a 1983-1984 Honda XR350R, piston wear directly impacts power delivery, fuel efficiency, and engine reliability. The Wiseco 85mm Piston Kit restores lost performance and allows you to safely push higher compression ratios without...4286M08500- SKU:
- 4286M08500
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 339 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 61.30 MM
- BORE SIZE METRIC:
- 85.00 MM
- ENGINE TYPE:
- 4-STROKE
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON DIAMETER METRIC:
- 84.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
$184.95 -
Wiseco Piston Kit with Gaskets for Kawasaki KX250 2007-2008 PK1598
WISECO
$307.95If you're rebuilding a KX250F or pushing your engine to its limits, piston quality directly impacts reliability and power output. The Wiseco PK1598 delivers forged aluminum construction that handles the demands of competitive riding while maintaining the...09030932- SKU:
- 09030932
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
$307.95 -
Wiseco Piston Kit 47mm 10.5:1 Compression for Honda CRF70F 2004-2012 PK1729
WISECO
$182.95If you're running a CRF70F and want measurable gains in power and throttle response, the Wiseco PK1729 piston kit delivers the compression ratio and engineering precision needed to unlock your bike's potential. This is a direct bolt-in upgrade that...09030933- SKU:
- 09030933
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON DIAMETER METRIC:
- 46.97 MM
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE SIZE METRIC:
- 47.00 MM
- MODEL:
- FORGED SERIES
$182.95 -
Wiseco Piston Kit Sea-Doo 3D 947 DI 2006-2007 716M08850
WISECO
$166.10If you're running a Sea-Doo 3D 947 DI, piston wear directly impacts power delivery, fuel efficiency, and engine longevity. The Wiseco 716M08850 piston kit restores lost compression and responsiveness while providing the durability needed for sustained...716M08850- SKU:
- 716M08850
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 88.50 MM
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 960 CC
- PISTON MATERIAL:
- ALUMINUM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- WATERCRAFT
$166.10 -
Wiseco Piston Kit 89mm for Sea-Doo GSX Limited 1998-1999 716M08900
WISECO
$174.95Worn or damaged pistons compromise combustion efficiency, throttle response, and engine longevity—especially in high-performance applications. The Wiseco 89mm Piston Kit is engineered to restore and exceed OEM specifications, delivering precise fitment...716M08900- SKU:
- 716M08900
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 89.00 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 971 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
$174.95 -
Wiseco Piston Kit 78mm Bore KTM 380 SX 1998-2002 748M07800
WISECO
$243.95If you're running a KTM 380 SX or EXC, the factory piston won't cut it if you're serious about trail performance or track reliability. A quality piston kit like this Wiseco directly impacts throttle response, combustion efficiency, and engine...748M07800- SKU:
- 748M07800
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 77,00 MM
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 368 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 77.00 MM
- UNITS:
- EACH
$243.95 -
Wiseco Piston Kit 79mm Bore 1998-2002 KTM 380 SX 748M07900
WISECO
$243.95Stock pistons in your KTM 380 SX reach their limits under aggressive riding and high-RPM demands. The Wiseco 79mm piston kit delivers the strength and precision your engine needs to maintain reliability while unlocking additional power—critical for...748M07900- SKU:
- 748M07900
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +1,00 MM
- DISPLACEMENT:
- 368 CC
- STROKE LENGTH METRIC:
- 77.00 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 77,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 79.00 MM
- PISTON MATERIAL:
- FORGED
$243.95 -
Wiseco Piston Kit 54mm for Suzuki RM125 1989-1999 641M05400
WISECO
$162.95If you're rebuilding a RM125 or chasing more responsive power delivery, a quality piston kit is non-negotiable. Wiseco's 54mm design delivers the precision fit and lightweight construction that separates a stock rebuild from a genuinely competitive...641M05400- SKU:
- 641M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$162.95 -
Wiseco Piston Kit 47mm Honda CR80R 1986-2002 643M04700
WISECO
$143.95A worn or stock piston limits your CR80R's potential—whether you're chasing lap times or simply want responsive, reliable power. The Wiseco 643M04700 delivers the strength and precision needed to unlock your bike's performance while maintaining the...643M04700- SKU:
- 643M04700
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- DISPLACEMENT:
- 82,9 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 47.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
$143.95 -
Wiseco Piston 78.50mm Sea-Doo GTX 1994-1995 663M07850
WISECO
$154.23When you're rebuilding a 650cc Sea-Doo engine, piston quality directly impacts reliability and peak performance. The Wiseco 663M07850 delivers the precision fit and thermal stability required for consistent power delivery, whether you're running stock...663M07850- SKU:
- 663M07850
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 658 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 78.50 MM
- PRODUCT NAME:
- PISTON
$154.23 -
Wiseco 81.00mm Piston Kit for Kawasaki 1100 STX 1997-1999 809M08100
WISECO
$149.95If you're running a Kawasaki 1100 STX and want reliable power gains without compromising engine longevity, a quality piston kit is non-negotiable. The Wiseco 809M08100 delivers the precision engineering and durability that serious riders demand, whether...809M08100- SKU:
- 809M08100
- Availability:
- Ships Same Business Day
- Weight:
- 1.04 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 1097 CC
- DISPLACEMENT:
- 760 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- BORE SIZE METRIC:
- 81.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON
$149.95
