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 Engine Rebuild Kit for 2010-2013 Honda CRF250R PWR168-100
WISECO
$877.95When your CRF250's engine reaches the end of its service life, a complete rebuild restores original performance and reliability without the cost of a full replacement. The Wiseco Engine Rebuild Kit...09031546- SKU:
- 09031546
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$877.95Qty in Cart: 0Quantity:Price:$877.95Subtotal: -
Wiseco Engine Rebuild Kit for 2005-2007 Honda CR250R PWR172-100
WISECO
$721.95A worn or damaged engine demands a complete rebuild, not a patch job. The Wiseco Engine Rebuild Kit for 2005-2007 Honda CRF250R delivers every critical component you need in one package—crankshaft,...09031548- SKU:
- 09031548
- Availability:
- Ships Same Business Day
- Weight:
- 13.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 66.40 MM
- FEATURES:
- GP SERIES PISTON
- OVERBORE METRIC:
- STANDARD
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$721.95 -
Wiseco Steel Exhaust Valve for Honda CRF70F 2004-2012 VES022
WISECO
$31.95If you're running a Honda CRF70F in competition or pushing it hard on the track, stock exhaust valves won't cut it. The Wiseco VES022 delivers the durability and heat resistance you need to maintain...09262233- SKU:
- 09262233
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- VALVE
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
Wiseco Steel Exhaust Valve Honda CRF250R 2008-2009 VES023
WISECO
$49.95Stock exhaust valves are a limiting factor in high-revving performance builds—they wear prematurely and struggle with sustained heat. The Wiseco Steel Exhaust Valve VES023 delivers the durability and...09262234- SKU:
- 09262234
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
$49.95 -
Wiseco Honda XR250R 1996-2004 Exhaust Valve VES024
WISECO
$38.95If you're running your XR250R hard—whether on the track or the trail—exhaust valve wear is inevitable without proper materials engineered to handle extreme heat and friction. The Wiseco VES024...09262235- SKU:
- 09262235
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$38.95 -
Wiseco Exhaust Valve Yamaha YZ400F 1998-1999 VES006
WISECO
$34.95High-mileage YZ400F engines demand exhaust valves that can handle sustained combustion temperatures and shock loads without degrading. The Wiseco VES006 delivers the durability and thermal stability...09260261- SKU:
- 09260261
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
Wiseco Exhaust Valve for Suzuki DR-Z400S 2000-2024 VES009
WISECO
$43.95The Wiseco Exhaust Valve VES009 is purpose-built for the Suzuki DR-Z400S to deliver reliable performance across thousands of operating hours. Engineered with advanced surface treatments, this valve...09260262- SKU:
- 09260262
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
$43.95 -
Wiseco Intake Valve Honda TRX400X 2012-2014 VIS003
WISECO
$29.95Stock intake valves are a common wear point in high-performance Honda ATV engines, especially when running aggressive cam profiles or elevated RPMs. The Wiseco VIS003 replaces that weak link with a...09260272- SKU:
- 09260272
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
Wiseco Intake Valve for Yamaha YZ400F 1998-1999 VIS006
WISECO
$24.99Intake valve reliability is critical in high-revving four-stroke engines, and factory components often fail under sustained performance demands. The Wiseco VIS006 is engineered with advanced surface...09260274- SKU:
- 09260274
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$24.99Qty in Cart: 0Quantity:Price:$24.99Subtotal: -
Wiseco Intake Valve Yamaha WR 400 F 1998-2000 VIS006C
WISECO
$28.95If you're running a WR 400 F at the track or trail, intake valve durability directly impacts combustion efficiency and engine longevity. Wiseco's CVD/CNI-coated intake valve reduces friction and wear...09260275- SKU:
- 09260275
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- CENTER INTAKE
$28.95Qty in Cart: 0Quantity:Price:$28.95Subtotal: -
Wiseco Intake Valve for Kawasaki KFX400 2003-2005 and Suzuki DR-Z400S 2000-2020 VIS009
WISECO
$38.95Factory intake valves wear down under sustained high RPM operation, leading to decreased airflow efficiency and compression loss. The Wiseco VIS009 addresses this with surface treatments that...09260276- SKU:
- 09260276
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$38.95 -
Wiseco Ring Set 62.5mm Gas Gas EC 200 2000-2014 2461CD
WISECO
$52.95A properly sealed combustion chamber is non-negotiable for performance and longevity. The Wiseco Ring Set 2461CD delivers precision-engineered sealing that reduces blow-by, maximizes compression, and...2461CD- SKU:
- 2461CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- DISPLACEMENT:
- 172 CC
- RIDING STYLE:
- SNOW
- BORE SIZE METRIC:
- 62.50 MM
- UNITS:
- SET
- DISPLACEMENT:
- 199 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
Wiseco 2-Stroke Piston Ring Set 68.25mm 1986-1989 Honda TRX250R 2687CD
WISECO
$52.95If you're running a Honda TRX250R, worn or damaged piston rings directly compromise compression, increase oil consumption, and rob you of the power you've built into your engine. The Wiseco 2687CD...2687CD- SKU:
- 2687CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- BORE SIZE METRIC:
- 68.25 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 436 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco Ring Set 68.50mm Honda TRX250R 1986-1989 2697CD
WISECO
$52.95If you're rebuilding a Honda TRX250R engine or upgrading your piston assembly, ring seal quality directly impacts compression, blow-by, and power delivery. The Wiseco 2697CD ring set is...2697CD- SKU:
- 2697CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 436 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 68.50 MM
- RIDING STYLE:
- SNOW
- UNITS:
- SET
$52.95 -
Wiseco 2-Stroke Piston Ring Set 67mm Bore Honda CR250R 1984-2001 2638CD
WISECO
$52.95Ring wear is one of the fastest killers of 2-stroke performance—loss of compression means loss of power, throttle response, and fuel efficiency. The Wiseco 2638CD Ring Set is precision-engineered...2638CD- SKU:
- 2638CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 195 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 171 CC
- UNITS:
- SET
$52.95 -
Wiseco 2-Stroke Piston Ring Set 49mm Honda CR80R 1986-2002 Kawasaki KX85 2014-2023 Suzuki RM80 1986-2001 Yamaha YZ80 1984-2001 1929CS
WISECO
$25.95A worn or damaged piston ring set will rob your 2-stroke of compression, throttle response, and overall power—especially critical in racing or high-RPM applications where every fraction of...1929CS- SKU:
- 1929CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- SET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 82,9 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco YZ85 2002-2024 Ring Set 49.50mm 1949CS
WISECO
$25.95The Wiseco YZ85 ring set maintains precise compression sealing across your entire power band, preventing blow-by losses that rob horsepower and degrade oil quality. Whether you're freshening a stock...1949CS- SKU:
- 1949CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 84,7 CC
- UNITS:
- SET
- BORE SIZE METRIC:
- 49.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
Wiseco Ring Set 50mm Kawasaki KE100 1976-2000 1969CD
WISECO
$52.95Piston ring sets are critical to engine longevity and performance—they maintain compression, prevent blow-by, and control oil consumption. If you're rebuilding a Kawasaki KE100 or upgrading to a...1969CD- SKU:
- 1969CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 50.00 MM
- DISPLACEMENT:
- 79,7 CC
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
Wiseco Suzuki RM125 2004-2008 GP Series Piston Kit PK1412
WISECO
$284.95If you're rebuilding the top end of your RM125, a quality piston kit is non-negotiable—it directly impacts compression, durability, and how your engine responds across the RPM band. The Wiseco GP...09030687- SKU:
- 09030687
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +4,00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 58.00 MM
- MODEL:
- RACER'S CHOICE
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +4.00 MM
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 125 CC
$284.95Qty in Cart: 0Quantity:Price:$284.95Subtotal: -
Wiseco Piston Kit Kawasaki KX85 2001-2008 782M04900
WISECO
$119.95Your KX85's performance gains or losses largely depend on piston quality—worn or substandard pistons rob your engine of power, throttle response, and reliability. The Wiseco Piston Kit restores your...09101237- SKU:
- 09101237
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 49.00 MM
- STROKE LENGTH METRIC:
- 45.80 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal:
