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 KX125 2003-2008 GP 788M05800
WISECO
$199.95The Wiseco Piston Kit is engineered to restore or upgrade your KX125's top-end with precision-matched components that deliver measurable gains in throttle response and engine efficiency. Whether you're rebuilding a worn motor or optimizing a modified...09101239- SKU:
- 09101239
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 144 CC
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +4,00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit Yamaha YZ125 2002-2004 797M05450
WISECO
$144.95If you're running a 2002-2004 YZ125, piston wear directly impacts your engine's power delivery, fuel efficiency, and reliability. Wiseco's forged-aluminum construction handles the high RPMs and thermal stress of both trail and competition riding, giving...09101240- SKU:
- 09101240
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$144.95 -
Wiseco 47mm Piston Kit with Gaskets for 1993-2001 Yamaha YZ80 PK1553
WISECO
$179.95Wiseco pistons are the gold standard for 2-stroke top-end rebuilds, engineered to withstand the extreme temperatures and pressures of high-RPM racing. This complete kit delivers the precision fitment and reliability you need to maximize power output...09030711- SKU:
- 09030711
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- PISTON DIAMETER METRIC:
- 46.95 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 47.80 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 82 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$179.95 -
Wiseco Piston Kit with Gaskets Yamaha YZ250 1995-1998 PK1569
WISECO
$264.95A worn or damaged top-end directly impacts your YZ250's power delivery and reliability—especially in demanding racing conditions. The Wiseco Piston Kit PK1569 delivers a complete, matched solution engineered specifically for your 1995-1998 Yamaha,...09030722- SKU:
- 09030722
- Availability:
- Ships Same Business Day
- Weight:
- 1.49 LBS
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 68.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 69.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 246.8 CC
- PISTON DIAMETER METRIC:
- 68.96 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +1,00 MM
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco Piston Kit 54mm for Yamaha YZ125 2005-2021 PK1571
WISECO
$212.95When you're pushing a YZ125 to its limits on the track or trail, your piston kit needs to handle extreme combustion pressures and temperature swings without compromise. Wiseco's forged-from-bar-stock construction delivers the strength and thermal...09030724- SKU:
- 09030724
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 53.95 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$212.95 -
Wiseco Piston Kit with Gaskets 56mm Honda CR125R 2000-2002 PK1580
WISECO
$259.95A top-end rebuild demands precision components that can withstand sustained high-RPM operation. The Wiseco Piston Kit delivers a complete solution with forged pistons and all necessary gaskets, eliminating the guesswork and multiple purchases required...09030731- SKU:
- 09030731
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +2,00 MM
- MODEL:
- RACER'S CHOICE
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 134 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 56.00 MM
- COOLING SYSTEM:
- AIR COOLED
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
$259.95Qty in Cart: 0Quantity:Price:$259.95Subtotal: -
Wiseco Honda CR125R 2003 Piston Kit with Gaskets PK1581
WISECO
$244.95A top-end rebuild demands precision components that can handle the demands of high-RPM racing. The Wiseco Honda CR125R piston kit delivers the durability and compression you need to maximize power output while maintaining long-term reliability. Whether...09030732- SKU:
- 09030732
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 125 CC
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Honda CR125R 2003 Piston Kit with Gaskets PK1582
WISECO
$264.95If you're rebuilding a 2003 Honda CR125R or planning an overbore, the Wiseco PK1582 Piston Kit delivers the durability and performance you need in one complete package. This forged high-silicon aluminum assembly eliminates guesswork with everything...09030733- SKU:
- 09030733
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 134 CC
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- COOLING SYSTEM:
- AIR COOLED
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Wiseco Piston Kit for Suzuki DR-Z400 2000-2004 PK1659
WISECO
$309.95When you're rebuilding a high-revving 2-stroke engine, component quality directly impacts reliability and peak performance. The Wiseco Piston Kit for your DR-Z400 delivers forged-piston strength with a complete gasket and ring set, eliminating guesswork...09030734- SKU:
- 09030734
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE SIZE METRIC:
- 90.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.2:1
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 62.60 MM
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$309.95 -
Wiseco Piston Kit 90mm 13.5:1 for Suzuki DR-Z400 2000-2018 PK1661
WISECO
$294.95The Wiseco Piston Kit PK1661 delivers the strength and thermal stability your DR-Z400 demands when you're pushing peak RPMs and sustained high-load conditions. High-silicone forged construction minimizes expansion under heat, preserving ring seal...09030736- SKU:
- 09030736
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- 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:
- 90.00 MM
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 62.60 MM
- DISPLACEMENT:
- 398 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 89.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
$294.95Qty in Cart: 0Quantity:Price:$294.95Subtotal: -
Wiseco Piston Kit 54.5mm 11:1 Compression Yamaha TTR125 2000-2021 PK1683
WISECO
$197.95If you're rebuilding your TTR125's top end, a quality piston kit is non-negotiable—it's the foundation of engine reliability and power output. The Wiseco PK1683 delivers forged-piston durability with a complete gasket and ring set, eliminating the...09030740- SKU:
- 09030740
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.00 MM
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
$197.95Qty in Cart: 0Quantity:Price:$197.95Subtotal: -
Wiseco Piston Kit 55mm Bore Yamaha TT-R125 2000-2004 PK1684
WISECO
$189.95When your TT-R125's original pistons wear out, a quality rebuild kit is the difference between a restored engine and a costly failure. Wiseco's forged piston kit delivers the durability and thermal stability you need for consistent performance, whether...09030741- SKU:
- 09030741
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 55.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123.7 CC
- PISTON DIAMETER METRIC:
- 54.95 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- TYPE:
- TOP END
$189.95 -
Wiseco Yamaha TTR125 2000-2021 Piston Kit with Gaskets PK1682
WISECO
$197.95If you're rebuilding your TTR125 top-end, a quality piston kit directly impacts engine reliability, power delivery, and longevity. Wiseco's high-silicone forged pistons are engineered to handle the thermal stress and detonation forces of performance...09030742- SKU:
- 09030742
- Availability:
- Ships Same Business Day
- Weight:
- 0.77 LBS
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 123.7 CC
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 53.95 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$197.95 -
Wiseco Piston Kit Honda CRF250R 2004-2007 4829M07800
WISECO
$210.95The stock piston in your CRF250R is a compromise between cost and performance—it's time to upgrade. A quality aftermarket piston like this Wiseco kit will sharpen throttle response, reduce combustion losses, and deliver measurable gains in power output...09100333- SKU:
- 09100333
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 52.20 MM
- DISPLACEMENT:
- 249 CC
- BORE SIZE METRIC:
- 78.00 MM
- PISTON MATERIAL:
- FORGED
$210.95 -
Wiseco Piston Kit Standard Bore 100mm 8.7:1 Compression Honda XR650L 1993-2020 4562M10000
WISECO
$248.95If you're running an XR650L that's seen serious miles or you're prepping for aggressive trail and off-road duty, a quality piston kit is essential to maintain compression, seal integrity, and reliability. Wiseco pistons are purpose-built for Honda's...09100337- SKU:
- 09100337
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 100.00 MM
- DISPLACEMENT:
- 650 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 8.7:1
- STROKE LENGTH METRIC:
- 82.00 MM
$248.95Qty in Cart: 0Quantity:Price:$248.95Subtotal: -
Wiseco Piston Kit for Kawasaki KX250 2005-2007 PK1379
WISECO
$285.95A worn or damaged piston directly limits your KX250's throttle response and peak power output. The Wiseco PK1379 kit restores—and exceeds—OEM performance with a high-silicone forged aluminum construction that handles sustained high-RPM abuse without...09030519- SKU:
- 09030519
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- DISPLACEMENT:
- 249.3 CC
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$285.95Qty in Cart: 0Quantity:Price:$285.95Subtotal: -
Wiseco Piston Kit Honda CR250R 1997-2001 702M06850
WISECO
$224.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and overall engine reliability—especially critical on a two-stroke like the CR250R where precision tolerances are non-negotiable. The Wiseco Piston Kit delivers...09101232- SKU:
- 09101232
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.50 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +2,10 MM
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 72.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco 450 EXC 2003-2007 Piston Kit PK1445
WISECO
$358.95Two-stroke engines demand precision components that can handle extreme combustion pressures and rapid thermal cycling. The Wiseco 450 EXC Piston Kit delivers the strength and dimensional stability your engine needs to perform at the limit—whether you're...09030690- SKU:
- 09030690
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 88.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 448 CC
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 89.00 MM
- MODEL:
- FORGED SERIES
$358.95Qty in Cart: 0Quantity:Price:$358.95Subtotal: -
Wiseco Piston Kit Standard 66.40mm Honda CR250R 1997-2001 768M06640
WISECO
$199.95The Wiseco Piston Kit delivers the strength and precision required for consistent CR250R performance across 1997-2001 model years. Whether you're pushing lap times or maintaining your two-stroke's reliability, this forged aluminum piston is engineered to...09101236- SKU:
- 09101236
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$199.95 -
Wiseco KX125 2001-2002 Piston Kit with Gaskets PK1502
WISECO
$219.95When you're rebuilding a KX125 top end, cutting corners on piston quality will cost you—either in lost performance or catastrophic engine failure. The Wiseco KX125 Piston Kit delivers the precision and durability needed to safely run your 2-stroke at the...09030697- SKU:
- 09030697
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE - OVERSIZE:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.95 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$219.95
