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!
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On Sale
Wiseco Wrist Pin Honda TRX300 FourTrax 1988-2000 S523
WISECO
MSRP: $23.99Now: $20.00Was: $23.99The wrist pin is a critical component that transfers combustion forces from the piston to the connecting rod, making it essential for reliable power delivery and engine longevity. A quality wrist pin like the Wiseco S523 minimizes deflection and wear,...S523- SKU:
- S523
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 17,00 MM
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 17.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- APPLICATION:
- PISTON
- LENGTH:
- 59,50 MM
- LENGTH METRIC:
- 59.50 MM
- PRODUCT NAME:
- WRIST PIN
MSRP: $23.99Now: $20.00Was: $23.99 -
On Sale
Wiseco Piston Kit Husqvarna FC450 2014-2022 RE805M09500
WISECO
MSRP: $388.95Now: $323.00Was: $388.95The Wiseco Piston Kit RE805M09500 is engineered to deliver measurable gains in throttle response and peak torque output for your Husqvarna FC450. Whether you're pushing for podium finishes or maximizing your bike's potential on the track, this complete...09105061- SKU:
- 09105061
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 95.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.0:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
MSRP: $388.95Now: $323.00Was: $388.95 -
On Sale
Wiseco Piston Yamaha YZF-R1 1998-2025 0.50mm 451M08550
WISECO
MSRP: $243.95Now: $200.00Was: $243.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and overall engine longevity—making piston replacement a critical maintenance item for any YZF-R1 owner serious about performance. The Wiseco 451M08550 delivers...451M08550- SKU:
- 451M08550
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- DISPLACEMENT:
- 465 CC
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 82.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 85.42 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 85.50 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $243.95Now: $200.00Was: $243.95 -
On Sale
Wiseco Piston Kit with Gaskets 55mm 2001 Yamaha YZ125 PK1350
WISECO
MSRP: $209.95Now: $178.00Was: $209.95When you're running a 2-cycle engine hard, piston failure isn't just an inconvenience—it's a race-ender. The Wiseco Piston Kit delivers the thermal stability and durability you need to keep your YZ125 performing at the edge without worrying about seizure...09030228- SKU:
- 09030228
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 54.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 55.00 MM
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
MSRP: $209.95Now: $178.00Was: $209.95 -
On Sale
Wiseco Piston Kit 49mm Honda CRF80F 2004-2013 PK1227
WISECO
MSRP: $187.95Now: $153.00Was: $187.95If you're running a CRF80F and want to unlock real performance gains, you need a piston kit engineered for the demands of high-RPM riding and racing. Wiseco's forged aluminum construction delivers the strength and thermal stability required to handle...09030232- SKU:
- 09030232
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +1,50 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.00 MM
- PISTON DIAMETER METRIC:
- 48.97 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
MSRP: $187.95Now: $153.00Was: $187.95 -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX65 2000-2020 PK1177
WISECO
MSRP: $172.95Now: $140.00Was: $172.95The Wiseco Piston Kit PK1177 is engineered for serious KX65 performance. If you're rebuilding a worn top-end or chasing reliability in competitive riding, this forged piston assembly delivers the strength and precision you need to handle sustained high...09030304- SKU:
- 09030304
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 44.50 MM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- DISPLACEMENT:
- 64 CC
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 44.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
MSRP: $172.95Now: $140.00Was: $172.95 -
On Sale
Wiseco Piston Kit with Gaskets for Kawasaki KX85 2001-2013 PK1187
WISECO
MSRP: $181.95Now: $140.00Was: $181.95When you're rebuilding a 2-stroke top-end, every component matters—and Wiseco's engineered tolerances are designed to keep your KX85 running at peak power without premature wear or ring flutter. This complete piston kit eliminates guesswork by including...09030306- SKU:
- 09030306
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 48.50 MM
- DISPLACEMENT:
- 84.9 CC
- PISTON DIAMETER METRIC:
- 48.45 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
MSRP: $181.95Now: $140.00Was: $181.95 -
On Sale
Wiseco Yamaha YZ125 1998-2000 Piston Kit with Gaskets PK1173
WISECO
MSRP: $225.95Now: $178.00Was: $225.95A top-end rebuild is non-negotiable if you're serious about YZ125 performance and longevity. Wiseco's forged piston kit delivers the precision fit and thermal stability your 2-stroke demands under sustained high RPM conditions. This complete kit...09030309- SKU:
- 09030309
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 124 CC
- STROKE LENGTH METRIC:
- 54.50 MM
- 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
MSRP: $225.95Now: $178.00Was: $225.95 -
On Sale
Wiseco Piston Kit with Gaskets for 1997-2001 Honda CR250R PK1168
WISECO
MSRP: $281.95Now: $217.00Was: $281.95A worn or damaged piston compromises combustion efficiency, throttle response, and engine reliability—especially critical in a 2-stroke where every component works at the edge of its limits. The Wiseco Piston Kit for your CR250R delivers a complete...09030311- SKU:
- 09030311
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 66.40 MM
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $281.95Now: $217.00Was: $281.95 -
Wiseco Piston Kit Standard 54mm Honda CR125R 1992-2003 676M05400
WISECO
$143.95The Wiseco Piston Kit delivers the durability and power output your Honda CR125R demands, whether you're pushing hard on the track or logging miles on the trail. Precision-forged from high-silicon aluminum alloy, this piston handles sustained combustion...676M05400- SKU:
- 676M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
$143.95 -
Wiseco Piston Kit 54.50 mm Honda CR125R 1992-2003 676M05450
WISECO
$154.95The Wiseco Piston Kit 54.50 mm is engineered for Honda CR125R riders who demand reliability under extreme conditions. Whether you're pushing lap times on the track or navigating technical terrain, this forged piston delivers the compression, durability,...676M05450- SKU:
- 676M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
$154.95 -
Wiseco 80.50mm Piston Kit for Kawasaki 1100 ZXi 1996-2003 809M08050
WISECO
$149.95If you're running a Kawasaki 1100 ZXi and pushing hard on the track, your factory piston won't cut it. The Wiseco 809M08050 is engineered from high-silicone forged stock to deliver the strength, thermal stability, and precision clearances that serious...809M08050- SKU:
- 809M08050
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 1083 CC
- DISPLACEMENT:
- 752 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 80.50 MM
- UNITS:
- EACH
$149.95 -
Wiseco Piston Kit 95mm 11.8:1 Compression KTM 450 XC-F 2012-2016 PK1901
WISECO
$369.95When your KTM 450 XC-F demands a complete top-end rebuild, the Wiseco Piston Kit PK1901 delivers the precision engineering and durability required for consistent high-RPM performance. High-silicone forged construction minimizes thermal expansion and...09031145- SKU:
- 09031145
- Availability:
- Ships Same Business Day
- Weight:
- 1.76 LBS
- BORE SIZE METRIC:
- 95.00 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 63.40 MM
- TYPE:
- TOP END
- DISPLACEMENT:
- 449 CC
- PISTON DIAMETER METRIC:
- 94.95 MM
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.8:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$369.95 -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1905
WISECO
$186.95A top-end rebuild demands precision components that won't fail under sustained high RPM and heat stress. The Wiseco Piston Kit delivers the durability and thermal stability your KX85 needs to maintain consistent power delivery and reliability through...09031149- SKU:
- 09031149
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 49.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 48.95 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 84.9 CC
- MODEL:
- PRO-LITE
- SKIRT COATING:
- NON-COATED
- TYPE:
- TOP END
$186.95 -
Wiseco Top End Bearing 12x16x15.8 Kawasaki KFX50 2003-2009 B1000
WISECO
$25.95The Wiseco B1000 top end bearing delivers the precision fit and durability your KFX50 needs to handle consistent high-RPM performance. Factory OEM bearings wear quickly under aggressive riding or racing conditions—this replacement maintains the tight...B1000- SKU:
- B1000
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 12 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- LENGTH METRIC:
- 15.8 MM
- OUTSIDE DIAMETER METRIC:
- 16 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- EACH
$25.95 -
Wiseco Top End Bearing for Suzuki LT250R QuadRacer 1985-1992 B1002
WISECO
$25.95The Wiseco B1002 top end bearing is purpose-built for the demanding conditions of QuadRacer competition and high-rpm trail riding. A worn or failing bearing kills engine efficiency, increases friction, and risks catastrophic seizure—this Wiseco unit...B1002- SKU:
- B1002
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- ALUMINUM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- OUTSIDE DIAMETER METRIC:
- 23 MM
- LENGTH METRIC:
- 23.8 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- UNITS:
- EACH
$25.95 -
Wiseco Top End Bearing Yamaha YFZ350 Banshee 1987-2006 B1005
WISECO
$25.95The Wiseco B1005 top end bearing is essential for maintaining precise piston-to-cylinder clearances and supporting sustained high-RPM operation in your YFZ350 Banshee. A worn or inadequate bearing accelerates top-end wear and compromises engine...B1005- SKU:
- B1005
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- LENGTH METRIC:
- 22.5 MM
- PRODUCT NAME:
- BEARING
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 21 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 16 MM
- MATERIAL:
- SILICONE
$25.95 -
Wiseco Top End Bearing Kawasaki KX85 2001-2024 B1006
WISECO
$25.95The Wiseco Top End Bearing B1006 is engineered to handle the extreme demands of high-revving two-stroke engines found in competitive KX85 platforms. A worn or substandard bearing will compromise piston speed consistency, increase friction losses, and...B1006- SKU:
- B1006
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 17.5 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 14 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$25.95 -
Wiseco Top End Bearing 15x19x20 KTM 125 SX 1998-2021 B1013
WISECO
$25.95The Wiseco B1013 top end bearing is engineered to handle the demands of high-RPM two-stroke performance, delivering reliability when your KTM 125 SX is pushed to its limits. Precision-manufactured with a case-hardened, high-silicon aluminum construction,...B1013- SKU:
- B1013
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 19.8 MM
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 19 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- INSIDE DIAMETER METRIC:
- 15 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
$25.95 -
Wiseco Top End Bearing Arctic Cat Cheetah 500 F/C 1986-1988 B1014
WISECO
$25.95The Wiseco B1014 top end bearing is engineered to handle sustained high-RPM operation without compromising reliability—critical for both competitive racing and demanding recreational riding on your Arctic Cat Cheetah 500. A precision-manufactured,...B1014- SKU:
- B1014
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- PISTON
- INSIDE DIAMETER METRIC:
- 18 MM
- MATERIAL:
- SILICONE
- LENGTH METRIC:
- 22 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 23 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
$25.95
