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 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, rod assembly, bearings, seals, and gaskets—all...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 consistent performance lap after lap, while its...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 thermal stability your CRF250R needs to handle...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 combats this with advanced CVD/CNI surface treatments that...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 your 1998-1999 Yamaha needs to maintain peak...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 resists thermal stress and wear far better than OEM...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 precision-engineered valve featuring advanced coatings...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 treatments that reduce wear and heat stress, directly...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 under high RPM loads, delivering measurable gains in...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 dramatically reduce friction while withstanding extreme heat,...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 minimizes oil consumption—critical whether you're...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
$52.95 -
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 ring set restores proper sealing and friction...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 precision-manufactured to match Wiseco piston specifications,...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 specifically for the Honda CR250R, delivering the exact...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
$27.51A 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 performance matters. The Wiseco 1929CS delivers the precision...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
$27.51 -
Wiseco YZ85 2002-2024 Ring Set 49.50mm 1949CS
WISECO
$27.51The 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 rebuild or optimizing a modified top-end, this ring set...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
$27.51 -
Wiseco Ring Set 50mm Kawasaki KE100 1976-2000 1969CD
WISECO
$56.13Piston 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 higher-displacement piston, the Wiseco 1969CD ring set...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
$56.13 -
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 Series PK1412 delivers forged construction and a complete...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
$284.95 -
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 machine to peak efficiency while handling the demands...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: -
Wiseco Piston Kit with Gaskets 56mm Kawasaki KX125 2001-2002 PK1503
WISECO
$239.95A worn or damaged piston compromises your KX125's power delivery and engine reliability—especially critical for a 2-stroke where combustion efficiency directly impacts performance. The Wiseco Piston Kit gives you a complete top-end solution with...09030698- SKU:
- 09030698
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON DIAMETER METRIC:
- 55.95 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$239.95
