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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On Sale
Wiseco Piston Kit 40.50mm for Yamaha PW50 1981-2021 653M04050
WISECO
MSRP: $109.95Now: $89.00Was: $109.95The Wiseco Piston Kit delivers the reliability and power output your Yamaha PW50 demands, whether you're pushing hard on track or tackling aggressive trail conditions. High-silicon aluminum forgings...653M04050- SKU:
- 653M04050
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 49 CC
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 39,20 MM
- STROKE LENGTH METRIC:
- 39.20 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- BORE SIZE METRIC:
- 40.50 MM
MSRP: $109.95Now: $89.00Was: $109.95Qty in Cart: 0Quantity:Price:MSRP: $109.95Now: $89.00Was: $109.95Subtotal: -
On Sale
Wiseco Piston Standard 66.40mm Kawasaki KX 250 2005-2008 607M06740
WISECO
MSRP: $221.95Now: $170.00Was: $221.95The Wiseco Piston Standard 66.40mm is engineered specifically for the Kawasaki KX250 (2005-2008), delivering the precision and durability needed for consistent performance on the track or trail. When...607M06740- SKU:
- 607M06740
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 67.40 MM
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 70,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 70.00 MM
- UNITS:
- EACH
MSRP: $221.95Now: $170.00Was: $221.95Qty in Cart: 0Quantity:Price:MSRP: $221.95Now: $170.00Was: $221.95Subtotal: -
On Sale
Wiseco Piston Kit 68.5mm Oversize Kawasaki KX 250 1992-2001 617M06850
WISECO
MSRP: $199.95Now: $170.00Was: $199.95Stock pistons can't handle the demands of high-RPM riding or extended performance sessions—they wear prematurely and limit your engine's potential. The Wiseco 68.5mm oversize piston kit restores lost...607M06800- SKU:
- 607M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,60 MM
- BORE - OVERSIZE METRIC:
- +0.60 MM
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 70,00 MM
- BORE SIZE METRIC:
- 68.00 MM
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 70.00 MM
- UNITS:
- EACH
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit 68.50mm 1991-1994 Kawasaki KDX250 607M06850
WISECO
MSRP: $199.95Now: $170.00Was: $199.95Stock pistons wear out under the demanding conditions of off-road riding, leading to compression loss, reduced power, and potential engine failure. The Wiseco Piston Kit 68.50mm restores your...607M06850- SKU:
- 607M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE METRIC:
- +1.10 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 70.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,10 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 68.50 MM
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH:
- 70,00 MM
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit Yamaha YZ 250 1988-1991 605M06800
WISECO
MSRP: $199.95Now: $170.00Was: $199.95Stock pistons in your YZ 250 can't handle sustained high RPM abuse—they expand unpredictably and rob you of peak power right when you need it most. The Wiseco 605M06800 piston kit solves this with a...605M06800- SKU:
- 605M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 68,00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246,8 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- STROKE LENGTH METRIC:
- 68.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 68.00 MM
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston Kit 68.50mm for 2002-2004 Honda CR250R 801M06850
WISECO
MSRP: $224.95Now: $191.00Was: $224.95The Wiseco Piston Kit is engineered for CR250R riders who refuse to leave performance on the table. A worn or stock piston limits your engine's potential—this kit restores compression, throttle...09100201- SKU:
- 09100201
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +2,10 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.10 MM
- DISPLACEMENT:
- 265 CC
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 68.50 MM
MSRP: $224.95Now: $191.00Was: $224.95Qty in Cart: 0Quantity:Price:MSRP: $224.95Now: $191.00Was: $224.95Subtotal: -
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...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...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 Piston Kit with Gasket for Suzuki RM-Z250 2010-2018 PK1878
WISECO
MSRP: $324.95Now: $276.00Was: $324.95When you're pushing your RMZ250 to the limit on the track, piston reliability becomes non-negotiable. Wiseco's forged piston kit delivers the durability and precision you need to maintain peak...09031167- SKU:
- 09031167
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 53.60 MM
- DISPLACEMENT:
- 250 CC
- SKIRT COATING:
- ARMORGLIDE®
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- PISTON DIAMETER METRIC:
- 76.96 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $324.95Now: $276.00Was: $324.95Qty in Cart: 0Quantity:Price:MSRP: $324.95Now: $276.00Was: $324.95Subtotal: -
On Sale
Wiseco Cam Chain Husqvarna FE 350S 2015-2016 CC033
WISECO
MSRP: $104.95Now: $89.00Was: $104.95The cam chain is critical to your FE 350S's valve timing integrity—any slack or wear directly impacts combustion efficiency and engine longevity. WISECO's CC033 replaces the OEM unit with a...09250651- SKU:
- 09250651
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- PRODUCT NAME:
- CHAIN
- CHAIN SIZE:
- 98XRH2015
- NUMBER OF LINKS:
- 112
MSRP: $104.95Now: $89.00Was: $104.95Qty in Cart: 0Quantity:Price:MSRP: $104.95Now: $89.00Was: $104.95Subtotal: -
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...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...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 2002-2003 Kawasaki KX250 PWR128-100
WISECO
MSRP: $659.95Now: $561.00Was: $659.95When your KX250's engine has logged serious hours, a complete rebuild is the only path to restoring full power and reliability. The Wiseco PWR128-100 Engine Rebuild Kit gives you every critical...09031607- SKU:
- 09031607
- Availability:
- Ships Same Business Day
- Weight:
- 14.00 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- BORE SIZE METRIC:
- 66.40 MM
MSRP: $659.95Now: $561.00Was: $659.95Qty in Cart: 0Quantity:Price:MSRP: $659.95Now: $561.00Was: $659.95Subtotal: -
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...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...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...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...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...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...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 -
On Sale
Wiseco Ring Set 67.75mm Kawasaki KX250 1987-1989 2668CD
WISECO
MSRP: $52.95Now: $42.00Was: $52.95A worn piston ring set compromises compression, increases blowby, and kills your engine's efficiency—especially critical on a two-stroke like the KX250. The Wiseco 2668CD restores proper sealing and...2668CD- SKU:
- 2668CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- SNOW
- UNITS:
- SET
- BORE SIZE METRIC:
- 67.75 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 246,8 CC
MSRP: $52.95Now: $42.00Was: $52.95Qty in Cart: 0Quantity:Price:MSRP: $52.95Now: $42.00Was: $52.95Subtotal:
