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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VERTEX Piston Kit 22356A
VERTEX
$208.95If you're building a high-revving engine or refreshing a worn bottom end, piston quality directly impacts reliability, longevity, and peak performance. The VERTEX Piston Kit 22356A delivers the metallurgical precision and surface engineering that...09102541- SKU:
- 09102541
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- CYLINDER DIAMETER METRIC:
- 68.00 MM
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- PISTON KIT
- PISTON DIAMETER METRIC:
- 67.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
$208.95 -
VERTEX Piston Kit 22584A
VERTEX
$183.95Your engine's performance and longevity depend on pistons engineered for both strength and precision. The VERTEX Piston Kit 22584A delivers forged durability with optimized geometry to maximize power across the entire RPM range while minimizing break-in...09102542- SKU:
- 09102542
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON DIAMETER METRIC:
- 66.34 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$183.95 -
VERTEX Piston Kit 22600B
VERTEX
$177.95A quality piston kit is the foundation of a reliable, high-performance top end. The VERTEX Piston Kit 22600B delivers the durability and precision needed for sustained power, whether you're rebuilding after race wear or upgrading to forged internals for...09102543- SKU:
- 09102543
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 53.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$177.95 -
VERTEX Piston Kit 22926C
VERTEX
$223.95The VERTEX Piston Kit 22926C is engineered for builders who demand reliability under extreme combustion pressures. Purpose-built with advanced heat treatment and low-friction coatings, these pistons accelerate break-in while extending service life in...09102547- SKU:
- 09102547
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PISTON DIAMETER METRIC:
- 63.96 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
$223.95 -
Wiseco Wrist Pin for 2023 Yamaha YZ250 S508
WISECO
$23.95The Wiseco S508 wrist pin is engineered for the demanding conditions of 2-stroke competition. This precision-engineered component handles the extreme reciprocating loads of your YZ250 S engine while maintaining dimensional stability across the entire RPM...S508- SKU:
- S508
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 72 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 18,00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 72 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
$23.95 -
Wiseco Piston Kit 75.50mm 10.5:1 Compression Honda XR250R 1984-1985 4329M07550
WISECO
$216.95If you're running a Honda XR250R or XL250R and want measurable gains in power and reliability, a quality piston kit is non-negotiable. The Wiseco 10.5:1 compression kit delivers the exact displacement and combustion efficiency your engine needs to...4329M07550- SKU:
- 4329M07550
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 250 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 75.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PISTON DIAMETER METRIC:
- 75.45 MM
- STROKE LENGTH METRIC:
- 56.50 MM
$216.95 -
Wiseco Piston Kit 1995-2021 Kawasaki KX100 52.5mm RE907M05250
WISECO
$171.95A worn or damaged piston directly kills engine performance, responsiveness, and reliability—especially in a high-revving 2-stroke like the KX100. The Wiseco Racer Elite Piston Kit delivers the precision engineering and durability needed to restore full...09105092- SKU:
- 09105092
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
$171.95 -
Wiseco Piston Kit 92.50mm 10.25:1 Honda XR500R 1983-1984 4330M09250
WISECO
$239.95If you're running an 1983-1984 Honda XR500R, the factory piston limits your engine's potential—especially under sustained load or aggressive throttle inputs. This Wiseco piston kit raises your compression ratio to 10.25:1, unlocking noticeable gains in...4330M09250- SKU:
- 4330M09250
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 92.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.25:1
- DISPLACEMENT:
- 498 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 75.00 MM
- PISTON DIAMETER METRIC:
- 92.45 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$239.95 -
On Sale
Wiseco Suzuki RM250 1982-1985 Piston Kit 70.00mm 485M07000
WISECO
MSRP: $199.95Now: $170.00Was: $199.95The Wiseco RM250 piston kit delivers the precision and durability required for sustained high-RPM performance on both track and trail. Factory OEM pistons often compromise between longevity and peak power—this Wiseco assembly gives you both, with...485M07000- SKU:
- 485M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 64.00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.92 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $199.95Now: $170.00Was: $199.95 -
On Sale
Wiseco 1982-1983 Yamaha YZ80 48.00mm Piston Kit 477M04800
WISECO
MSRP: $134.95Now: $115.00Was: $134.95If you're running a YZ80 in competitive or high-demand conditions, a worn or compromised piston directly impacts throttle response, compression consistency, and overall engine reliability. The Wiseco 477M04800 is engineered to restore—or exceed—OEM...477M04800- SKU:
- 477M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 79 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.60 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
MSRP: $134.95Now: $115.00Was: $134.95 -
On Sale
Wiseco Piston Kit 39mm 11:1 Compression Honda CRF50F 2004-2013 4798M03900
WISECO
MSRP: $146.95Now: $102.00Was: $146.95If you're running a Honda CRF50F, XR50R, or Z50R and want to unlock measurable gains in power and acceleration, a quality piston upgrade is one of the highest-impact modifications you can make. The Wiseco 39mm 11:1 compression piston kit replaces a worn...09100202- SKU:
- 09100202
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COMPRESSION RATIO IMPERIAL:
- 11.1:1
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 39.00 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 49.5 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 41.40 MM
MSRP: $146.95Now: $102.00Was: $146.95 -
On Sale
Wiseco Piston Kit 68.50mm 2.10mm Oversize Yamaha YZ250 1999-2020 804M06850
WISECO
MSRP: $232.95Now: $191.00Was: $232.95The Yamaha YZ250 demands a piston built for the rigors of competitive riding—stock components simply don't cut it when you're pushing peak RPMs lap after lap. Wiseco's Pro-Lite design delivers the durability and responsiveness you need to maintain edge...09100207- SKU:
- 09100207
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 68.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- BORE - OVERSIZE:
- +2,10 MM
- BORE - OVERSIZE METRIC:
- +2.10 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 265 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
MSRP: $232.95Now: $191.00Was: $232.95 -
On Sale
Wiseco Top End Bearing 19x24x24.8 for Kawasaki KX500 1988-2004 B1036
WISECO
MSRP: $25.95Now: $20.00Was: $25.95If you're pushing your KX500 to its limits, top-end bearing wear is non-negotiable—this is where power transfers directly to performance. The Wiseco B1036 is engineered specifically for the demands of high-rpm four-stroke racing, delivering the precision...09240123- SKU:
- 09240123
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER METRIC:
- 24 MM
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- INSIDE DIAMETER METRIC:
- 19 MM
- LENGTH METRIC:
- 24.8 MM
- PRODUCT NAME:
- BEARING
- APPLICATION:
- PISTON
MSRP: $25.95Now: $20.00Was: $25.95 -
On Sale
Wiseco Connecting Rod Kit Racer Elite Honda CRF250R 2004-2017 WPR1334
WISECO
MSRP: $435.95Now: $380.00Was: $435.95If you're pushing your CRF250R to the limit on the track, your stock connecting rods are holding you back. Wiseco's Racer Elite kit replaces them with precision billet components engineered to handle sustained high-RPM abuse without failure. This is the...09230590- SKU:
- 09230590
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- UNITS:
- KIT
- TYPE:
- RACER ELITE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $435.95Now: $380.00Was: $435.95 -
On Sale
Wiseco Engine Rebuild Kit for 2006 KTM 250 SX 66.40mm PWR179-100
WISECO
MSRP: $791.52Now: $706.00Was: $791.52When your 2-stroke 250cc engine shows signs of wear—loss of compression, sluggish throttle response, or visible carbon buildup—a complete rebuild is the most cost-effective path to restoring full performance. The Wiseco PWR179-100 kit eliminates the...09031660- SKU:
- 09031660
- Availability:
- Ships Same Business Day
- Weight:
- 13.10 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
MSRP: $791.52Now: $706.00Was: $791.52 -
On Sale
Wiseco Engine Rebuild Kit for KTM 300 XC 2008-2015 PWR238-101
WISECO
MSRP: $967.55Now: $822.00Was: $967.55A two-stroke engine rebuild demands precision components that can handle the demands of high-RPM operation, and the Wiseco PWR238-101 delivers exactly that. This comprehensive kit eliminates the guesswork by bundling every critical component you need for...09031666- SKU:
- 09031666
- Availability:
- Ships Same Business Day
- Weight:
- 14.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 72.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $967.55Now: $822.00Was: $967.55 -
On Sale
Wiseco Ring Set 66.75mm Honda CR250R 1984-1985 2628CD
WISECO
MSRP: $52.95Now: $42.00Was: $52.95Worn or damaged piston rings are one of the fastest ways to lose compression, increase oil consumption, and compromise engine reliability. The Wiseco Ring Set 2628CD is precision-engineered to restore proper sealing on your Honda CR250R, ensuring...2628CD- SKU:
- 2628CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 195 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.75 MM
- UNITS:
- SET
- DISPLACEMENT:
- 246 CC
MSRP: $52.95Now: $42.00Was: $52.95 -
On Sale
Wiseco Ring Set 67.25mm Honda TRX250R 1986-1989 Suzuki LT250R 1987-1992 2648CD
WISECO
MSRP: $52.95Now: $42.00Was: $52.95Engine ring sets are critical wear items that directly impact compression, blow-by control, and overall power output—especially in high-RPM applications where factory tolerances wear quickly. The Wiseco 2648CD delivers OEM-quality sealing with materials...2648CD- SKU:
- 2648CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 67.25 MM
- PRODUCT NAME:
- PISTON RING
- DISPLACEMENT:
- 67,25 CC
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
MSRP: $52.95Now: $42.00Was: $52.95 -
On Sale
Wiseco Piston Ring Set 67.40mm for Kawasaki KX250 1987-1991 2652CD
WISECO
MSRP: $52.95Now: $42.00Was: $52.95Worn or damaged piston rings kill engine efficiency and power output—they're critical to maintaining proper compression and controlling oil consumption in your KX250. The WISECO 2652CD ring set restores factory-spec performance and durability, engineered...2652CD- SKU:
- 2652CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 67.40 MM
MSRP: $52.95Now: $42.00Was: $52.95 -
On Sale
Wiseco Piston Ring Set 67.5mm Bore Honda CR250R 1984-2004 2658CD
WISECO
MSRP: $52.95Now: $42.00Was: $52.95Piston rings are critical to engine sealing, compression, and longevity—worn or inadequate rings compromise performance and invite catastrophic engine damage. The Wiseco 2658CD is a precision-engineered ring set built to handle the extreme combustion...2658CD- SKU:
- 2658CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 67.50 MM
- DISPLACEMENT:
- 612 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 594 CC
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- SET
MSRP: $52.95Now: $42.00Was: $52.95
