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 Kawasaki KX100 2014-2021 880M05250
WISECO
$138.95Your KX100's factory piston won't cut it if you're pushing harder on the track or trail. The Wiseco 880M05250 Pro-Lite delivers measurable gains in compression efficiency and engine durability through precision engineering and high-silicon aluminum...09103965- SKU:
- 09103965
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 99 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 45.80 MM
$138.95Qty in Cart: 0Quantity:Price:$138.95Subtotal: -
Wiseco Piston Kit Kawasaki KX450F 2013-2018 12.5:1 Compression 40082M09600
WISECO
$255.95If you're running a KX450F at the edge of its limits, a worn or stock piston limits your engine's potential for power and reliability. The Wiseco 40082M09600 delivers a 12.5:1 compression ratio that extracts measurable gains in horsepower and torque...09103172- SKU:
- 09103172
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 96.00 MM
- DISPLACEMENT:
- 449 CC
$255.95 -
Wiseco Piston Kit Racer Elite 96mm 14:1 Compression Honda TRX450R 2006-2009 RE817M09600
WISECO
$388.95If you're running a Honda TRX450R or TRX450ER, this piston kit delivers the compression ratio and durability you need to extract real power gains without compromising reliability. The 14:1 compression ratio increases torque response and throttle snap,...09105126- SKU:
- 09105126
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- BORE SIZE METRIC:
- 96.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- ATV
$388.95 -
Wiseco Piston Kit Yamaha YZ65 2018-2026 43.5mm 885M04350
WISECO
$127.95The Wiseco 885M04350 piston kit is engineered to deliver the durability and precision your YZ65 demands, whether you're racing competitively or pushing hard on the trail. Stock pistons wear quickly under aggressive riding—this kit replaces them with...09105380- SKU:
- 09105380
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 43.50 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
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 Piston Kit 53mm for 2002-2009 Suzuki RM85 RE901M05300
WISECO
$169.95Stock pistons in the RM85 platform wear quickly under competitive riding conditions, robbing you of compression and throttle response. The Wiseco RE901M05300 Racer Elite kit delivers OEM-grade reliability with measurably improved ring seal and detonation...09105110- SKU:
- 09105110
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$169.95Qty in Cart: 0Quantity:Price:$169.95Subtotal: -
Wiseco RM125 2004-2007 Piston Kit RE914M05400
WISECO
$204.95The Wiseco RE914M05400 Racer Elite piston kit delivers the compression, durability, and throttle response your RM125 demands during competition or high-intensity riding. With ArmorPlating detonation shielding and a precision-engineered skirt coating,...09105111- SKU:
- 09105111
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE SIZE METRIC:
- 54.00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
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 2-Stroke Piston Kit 48mm Oversize Yamaha YZ85 2002-2025 RE900M04800
WISECO
$134.95The Wiseco RE900M04800 is purpose-built for YZ85 racers who demand reliability when it matters most. Whether you're chasing podiums or rebuilding after hard use, this 48mm oversize piston kit restores your engine to peak performance while delivering the...09105117- SKU:
- 09105117
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 54mm Yamaha YZ125 2005-2024 RE905M05400
WISECO
$221.95The Wiseco Piston Kit RE905M05400 delivers the reliability and power output that YZ125 racers demand. Built from premium 2000 Series forged alloy, this piston withstands the extreme combustion pressures of competitive two-stroke racing while maintaining...09105120- SKU:
- 09105120
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- 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
- BORE SIZE METRIC:
- 54.00 MM
$221.95Qty in Cart: 0Quantity:Price:$221.95Subtotal: -
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 Racer Elite Yamaha YZ125 2005-2021 RE906M05800
WISECO
$204.95A worn or damaged piston directly impacts combustion efficiency, throttle response, and engine longevity—especially in high-rpm 2-stroke applications like the YZ125. The Wiseco Racer Elite kit replaces compromised internals with precision-engineered...09105122- SKU:
- 09105122
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE METRIC:
- 48.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +4.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE:
- +4,00 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco YZ250 1999-2024 Racer Elite Piston Kit 66.40mm RE902M06640
WISECO
$249.95The piston is the powerhouse of your 2-stroke engine—it's where combustion converts to acceleration. A worn or undersized piston kills compression, throttle response, and overall performance. The Wiseco RE902M06640 Racer Elite Kit restores that lost...09105123- SKU:
- 09105123
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- 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
- BORE SIZE METRIC:
- 66.40 MM
$249.95Qty in Cart: 0Quantity:Price:$249.95Subtotal: -
Wiseco Piston Kit with Gaskets for 2003 Suzuki RM100 PK1155
WISECO
$179.95A worn top-end can quietly rob your RM100 of power and responsiveness. The Wiseco PK1155 restores lost compression and combustion efficiency with aerospace-grade forged aluminum pistons machined to exact tolerances, so you get reliable throttle response...09030181- SKU:
- 09030181
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 53.00 MM
- DISPLACEMENT:
- 99 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 52.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +0,50 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Honda CR85R 2003-2007 Piston Kit with Gaskets PK1218
WISECO
$184.95A worn or damaged piston directly compromises your CR85R's compression, throttle response, and overall reliability—especially critical in competitive or high-demand riding. The Wiseco PK1218 restores your top-end to OEM specifications with...09030183- SKU:
- 09030183
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- BORE SIZE METRIC:
- 50.50 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +3,00 MM
- DISPLACEMENT:
- 84.7 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- SKIRT COATING:
- NON-COATED
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 50.45 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Kit for Honda XR250R 1986-2004 74mm 10.5:1 Compression PK1221
WISECO
$257.95The stock piston in your XR250R will eventually show signs of wear—especially if you're pushing the engine hard or running higher octane fuel for increased performance. The Wiseco PK1221 restores compression integrity and adds measurable power while...09030193- SKU:
- 09030193
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- BORE SIZE METRIC:
- 74.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 73.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 59.50 MM
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
$257.95Qty in Cart: 0Quantity:Price:$257.95Subtotal: -
Wiseco Honda XR200R 1992-2002 66.5mm Piston Kit with Gaskets PK1126
WISECO
$204.95The Wiseco PK1126 Piston Kit is engineered for riders who demand reliability and measurable performance gains from their Honda XR200R. Whether you're rebuilding after high-mileage wear or upgrading for competitive advantage, this kit delivers the...09030201- SKU:
- 09030201
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE:
- +1,00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- BORE SIZE METRIC:
- 66.50 MM
- DISPLACEMENT:
- 192 CC
- PISTON DIAMETER METRIC:
- 66.45 MM
- TYPE:
- TOP END
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Honda CR250R 1997-2001 Piston Kit with Gaskets 67.50mm PK1170
WISECO
$259.95If you're rebuilding the top end of a 1997-2001 Honda CR250R, you need a piston kit engineered to withstand the demands of two-stroke racing. The Wiseco PK1170 delivers the compression consistency and durability required to restore full power output...09030208- SKU:
- 09030208
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.10 MM
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 67.46 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
$259.95Qty in Cart: 0Quantity:Price:$259.95Subtotal: -
Wiseco Yamaha PW50 1981-2020 Piston Kit 41mm PK1161
WISECO
$149.95A worn top-end can rob your PW50 of power and reliability—the Wiseco PK1161 gives you a straightforward path back to peak performance. This complete piston kit delivers the precision machining and durable materials you need for a rebuild that lasts,...09030269- SKU:
- 09030269
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- UNITS:
- EACH
- BORE SIZE METRIC:
- 41.00 MM
- MODEL:
- RACER'S CHOICE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 39.20 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
$149.95Qty in Cart: 0Quantity:Price:$149.95Subtotal:
