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 Standard 95.50mm 13:1 Compression Suzuki RM-Z450 2005-2007 4870M09550
WISECO
$269.95The Wiseco 4870M09550 Pro-Lite Piston Kit is engineered for RM-Z450 riders who need reliable performance under demanding conditions. A higher 13:1 compression ratio delivers measurable gains in torque and horsepower, while the forged aluminum...09100793- SKU:
- 09100793
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 62.80 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 95.50 MM
- DISPLACEMENT:
- 450 CC
- SKIRT COATING:
- MOLY COATED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.0:1
$269.95 -
Wiseco Piston Kit Honda CR80R 1986-2002 49mm 643M04900
WISECO
$155.95If you're rebuilding a Honda CR80R engine or pushing your current one to its limits, the Wiseco 643M04900 Pro-Lite Piston Kit delivers the precision fit and lightweight construction needed for reliable high-RPM performance. This complete kit eliminates...09101221- SKU:
- 09101221
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 49.00 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 47.80 MM
$155.95 -
Wiseco Piston Kit with Gaskets 54mm Suzuki RM125 2004-2008 PK1410
WISECO
$264.95A worn-out top end kills power and reliability on the track or trail. The Wiseco PK1410 gives your RM125 a complete refresh with precision-engineered components that restore compression, throttle response, and durability. This all-in-one kit eliminates...09030685- SKU:
- 09030685
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- COOLING SYSTEM:
- AIR COOLED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 125 CC
- MODEL:
- RACER'S CHOICE
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- REBUILD KIT
$264.95 -
Wiseco 45mm Piston Kit with Gaskets for 1999-2008 KTM 65 SX PK1514
WISECO
$191.95When your KTM 65 SX top end starts losing compression and power, a quality piston kit isn't optional—it's essential to restore competitive performance and prevent catastrophic engine damage. The Wiseco PK1514 delivers OEM-quality reliability with the...09030701- SKU:
- 09030701
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 63.58 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 44.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 45.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 40.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
$191.95 -
Wiseco Piston Kit 49.00mm Suzuki RM85 2002-2020 806M04900
WISECO
$119.95The stock piston in your RM85 can only take so much abuse before wear compromises performance and reliability. Wiseco's 806M04900 delivers the durability and precision fit you need to maintain peak horsepower and throttle response, whether you're...09101249- SKU:
- 09101249
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 84.7 CC
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$119.95 -
Wiseco Piston Kit Yamaha YZ125 2005-2021 846M05800
WISECO
$210.95The piston is the heart of your YZ125's engine—responsible for transferring combustion force into usable power. A worn or stock piston limits your bike's potential, reducing compression efficiency and increasing blow-by. The Wiseco 846M05800 restores and...09101255- SKU:
- 09101255
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +4.00 MM
- BORE SIZE METRIC:
- 58.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +4,00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- RIDING STYLE:
- OFF-ROAD
$210.95 -
Wiseco Piston Kit 90.5mm 1.5mm Oversize Honda CR500R 1984-2001 871M09050
WISECO
$255.95The Wiseco 871M09050 delivers the compression and durability required to extract maximum power from your CR500R while maintaining reliability through extended high-rpm operation. Built with aerospace-grade aluminum and precision CNC machining, this...09102025- SKU:
- 09102025
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 76.00 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.50 MM
- BORE SIZE METRIC:
- 90.50 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,50 MM
- DISPLACEMENT:
- 508 CC
$255.95 -
Wiseco Piston Kit Standard 41mm for Kawasaki KFX50 2003-2009 826M04100
WISECO
$121.95If you're running a KFX50 and want reliable power without compromise, the Wiseco 826M04100 Piston Kit delivers the precision engineering needed for consistent performance across racing and trail conditions. This complete kit eliminates guesswork—you get...09100339- SKU:
- 09100339
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 41.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 37.80 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 49 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$121.95 -
Wiseco Piston Kit 54.50 mm Kawasaki KX100 1995-2013 Suzuki RM100 2003 651M05450
WISECO
$139.95When your 2-stroke engine is the difference between winning and second place, every component matters. The Wiseco 651M05450 Pro-Lite Piston Kit delivers the precision engineering and thermal durability your KX100 or RM100 demands, whether you're pushing...09100345- SKU:
- 09100345
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 54.50 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$139.95 -
Wiseco Piston Kit Kawasaki KX125 2004-2008 56.00 mm 2.00 mm Oversize 834M05600
WISECO
$174.95A worn or stock piston limits your KX125's potential—this Wiseco Pro-Lite kit restores compression, throttle response, and engine longevity with precision-engineered components built for 2-stroke demands. Whether you're chasing track times or pushing...09100347- SKU:
- 09100347
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 133 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$174.95 -
Wiseco Piston Kit 77.00mm 14.1:1 Compression Kawasaki KX250F 2004-2005 Suzuki RM-Z250 2004-2006 4843M07700
WISECO
$264.95If you're running a KX250F or RM-Z250 and want measurable gains in peak power and mid-range response, a high-compression piston kit is one of the most direct bolt-on upgrades available. The Wiseco 4843M07700 delivers a 14.1:1 compression ratio with...09100356- SKU:
- 09100356
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$264.95 -
Wiseco Piston Kit 54.50mm for Kawasaki KX100 1998-2013 PK1156
WISECO
$220.95If you're running a Kawasaki KX100 and want reliable top-end performance that actually delivers, a quality piston kit isn't optional—it's essential. The Wiseco PK1156 gives you forged pistons engineered for the thermal demands of competitive riding, with...09030515- SKU:
- 09030515
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 99 CC
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 54.45 MM
- TYPE:
- TOP END
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE SIZE METRIC:
- 54.50 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$220.95 -
Wiseco Piston Kit 97mm 13.5:1 Compression for 2007-2012 KTM 450 SX-F 4938M09700
WISECO
$284.95If you're running a KTM 450 SX-F or XC-F and want measurable gains in power and throttle response, a quality piston kit is one of the highest-impact upgrades you can make. The Wiseco 4938M09700 delivers a 13.5:1 compression ratio that extracts real...09100851- SKU:
- 09100851
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.80 MM
- DISPLACEMENT:
- 449 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 97.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- MOLY COATED
$284.95 -
Wiseco Piston Kit Sea-Doo 650 1993-1994 WK1118
WISECO
$392.70If you're running a Sea-Doo 650 and want to restore lost compression or build additional power, piston replacement is non-negotiable. The Wiseco WK1118 delivers the precision fit and material quality that separates reliable performance from catastrophic...WK1118- SKU:
- WK1118
- Availability:
- Ships Same Business Day
- Weight:
- 2.63 LBS
- BORE SIZE METRIC:
- 79.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 73.90 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 666 CC
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$392.70 -
Wiseco Piston Kit Sea Doo XP Limited 1998-1999 951 040 WK1213
WISECO
$459.57If you're running a 1998-1999 Sea-Doo XP Limited 951, piston quality directly impacts how much power you can reliably extract from your engine. The Wiseco WK1213 delivers CNC-machined Pro-Lite pistons built from aerospace-grade forged aluminum—the same...WK1213- SKU:
- WK1213
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 971 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 89.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- WATERCRAFT
- PISTON DIAMETER METRIC:
- 88.90 MM
- PRODUCT NAME:
- REBUILD KIT
$459.57 -
Wiseco Piston Kit Yamaha GP1200 1997-1999 WK1313
WISECO
$594.95If you're running a Yamaha GP1200, piston wear directly impacts throttle response, fuel efficiency, and engine longevity. The Wiseco WK1313 restores—or exceeds—OEM performance with a complete overhaul kit that includes rings and gaskets, eliminating...WK1313- SKU:
- WK1313
- Availability:
- Ships Same Business Day
- Weight:
- 4.70 LBS
- BORE SIZE METRIC:
- 84.50 MM
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- PISTON DIAMETER METRIC:
- 84.37 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 1142 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$594.95 -
On Sale
Wiseco Piston Kit Yamaha GP 1200 WaveRunner 1997-1999 1 mm WK1314
WISECO
MSRP: $581.67Now: $372.00Was: $581.67Factory pistons won't survive sustained high-RPM operation in a 2-stroke watercraft—thermal stress and detonation will cause catastrophic failure. The Wiseco WK1314 kit is engineered specifically for the Yamaha GP 1200 with forged aluminum construction...WK1314- SKU:
- WK1314
- Availability:
- Ships Same Business Day
- Weight:
- 4.70 LBS
- BORE SIZE METRIC:
- 85.00 MM
- DISPLACEMENT:
- 1156 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 84.87 MM
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
MSRP: $581.67Now: $372.00Was: $581.67 -
Wiseco 54mm Racer Elite Piston Kit for 1995-2003 Honda CR125R RE908M05400
WISECO
$221.95If you're running a CR125R that's seeing serious track time, piston wear is inevitable—and a worn piston kills compression, throttle response, and overall power delivery. The Wiseco RE908M05400 Racer Elite kit gives you OEM-spec fitment with race-proven...09105078- SKU:
- 09105078
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$221.95 -
Wiseco Valve Kit for Suzuki RM-Z250 2007-2020 SVKB3338
WISECO
$365.95Stock valve assemblies on your RM-Z250 wear down quickly under aggressive riding, causing loss of compression and compromised engine response. The Wiseco SVKB3338 Valve Kit delivers a complete solution with matched steel valves and precision springs that...09263070- SKU:
- 09263070
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STEEL
- APPLICATION:
- INTAKE
$365.95 -
Wiseco Piston Standard Kawasaki KX 250 1992-2001 617M06640
WISECO
$221.95If you're running a KX250 hard enough to wear out the original piston, you need a replacement that matches your commitment to performance. The Wiseco 617M06640 delivers the precision bore diameter and lightweight construction required to maintain...617M06640- SKU:
- 617M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 70,00 MM
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 70.00 MM
- UNITS:
- EACH
$221.95
