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 Valve Kit for KTM 250 SX-F 2008-2012 SVKB6329
WISECO
$344.95Keep your KTM 250 SX-F's top-end in peak condition with a complete valve kit engineered to OEM specifications. Wiseco's matched valve and spring set eliminates the guesswork of sourcing individual components, ensuring proper load distribution and...09263082- SKU:
- 09263082
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- UNITS:
- KIT
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Valve Kit 2012-2016 KTM 350 SX-F SVKB6351
WISECO
$365.95If you're running a 2012-2016 KTM 350 SX-F at the track or trail, valve wear directly impacts combustion efficiency and throttle response. The Wiseco Valve Kit SVKB6351 replaces worn intake and exhaust valves with precision-engineered steel components...09263085- SKU:
- 09263085
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$365.95Qty in Cart: 0Quantity:Price:$365.95Subtotal: -
Wiseco Piston Ring Set 57mm Bore Yamaha YZ125 1976-1993 2244CS
WISECO
$25.95A worn or damaged piston ring set robs your YZ125 of compression and power while increasing blow-by and oil consumption. The Wiseco 2244CS delivers precision-engineered sealing that restores engine efficiency and extends top-end life, whether you're...2244CS- SKU:
- 2244CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- DISPLACEMENT:
- 124 CC
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 125 CC
- BORE SIZE METRIC:
- 57.00 MM
- UNITS:
- SET
$25.95 -
Wiseco Ring Set 78.00mm 1998-2002 KTM 380 SX 3071TD
WISECO
$57.95Piston ring sets are critical wear items that directly impact compression, blow-by control, and engine longevity. The Wiseco 3071TD delivers OEM-quality sealing with precision manufacturing that minimizes friction and heat, essential for 2-stroke...3071TD- SKU:
- 3071TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 78.00 MM
- RIDING STYLE:
- SNOW
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$57.95 -
Wiseco Piston Kit Honda CR500R 1984-2001 91.00mm 871M09100
WISECO
$255.95The Wiseco Piston Kit is engineered for Honda CR500R two-stroke engines that demand reliability at extreme RPM. This 91.00mm, 2.0mm oversize piston delivers improved combustion efficiency and responsive power delivery, making it essential for riders who...09102026- SKU:
- 09102026
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 91.00 MM
- DISPLACEMENT:
- 472 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 76.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 491 CC
$255.95 -
Wiseco Piston Kit 56.00 mm Bore Yamaha YZ125 2005-2021 845M05600
WISECO
$174.95If you're running a YZ125 and want measurable gains in displacement-dependent power and throttle response, a quality piston upgrade is one of the most direct paths forward. The Wiseco 56.00 mm piston kit delivers a +2.00 mm bore increase—translating to...09100572- SKU:
- 09100572
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- DISPLACEMENT:
- 134 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit Standard 77mm 12.7:1 Compression Yamaha YZ250F 2001-2004 4872M07700
WISECO
$174.95The Wiseco Piston Kit delivers precision engineering where it matters most—inside your YZ250F's combustion chamber. A properly matched piston assembly is critical for maintaining compression ratios, maximizing power transfer, and ensuring long-term...09100573- SKU:
- 09100573
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 77.00 MM
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 249 CC
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 64mm Bore Suzuki TS185 1971-1981 176M06400
WISECO
$162.95A worn or damaged piston directly limits your TS185's performance and reliability—whether you're tackling technical trail sections or pushing hard on the track. Wiseco's high-silicon alloy construction delivers the strength and thermal stability needed...176M06400- SKU:
- 176M06400
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 57.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 183 CC
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 63.92 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
$162.95 -
Wiseco Piston Kit 0.50mm Oversize for Suzuki DS185 1978-1980 176M06450
WISECO
$162.95When you're pushing your DS185 to its limits on the trail or track, stock pistons become your weakest link. The Wiseco 0.50mm oversize piston kit delivers the durability and precision fit needed to handle higher compression and aggressive riding, while...176M06450- SKU:
- 176M06450
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- PISTON DIAMETER METRIC:
- 64.42 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 57.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 183 CC
- BORE SIZE METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
$162.95Qty in Cart: 0Quantity:Price:$162.95Subtotal: -
Wiseco Piston Kit 1.0mm Oversize 65.92mm for Suzuki TS185 1971-1981 176M06500
WISECO
$154.95A worn or damaged piston forces your TS185 into the shop and out of commission. The Wiseco 1.0mm oversize piston kit restores compression, power delivery, and engine reliability with a complete ring and circlip assembly—no secondary purchases needed...176M06500- SKU:
- 176M06500
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 183 CC
- BORE SIZE METRIC:
- 65.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 64.92 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 57.00 MM
- UNITS:
- KIT
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Kit Kawasaki JS650 1987-1993 76.50mm Bore WK1017
WISECO
$344.95If you're rebuilding a 2-stroke JS650, you need pistons engineered to handle the extreme heat and pressure cycles that stock components simply can't sustain. Wiseco's high-silicone forged piston kit delivers the durability and precision ring fit that...WK1017- SKU:
- WK1017
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 643 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE SIZE METRIC:
- 76.50 MM
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 76.40 MM
- RIDING STYLE:
- WATERCRAFT
$344.95 -
Wiseco Piston Kit for Suzuki DR350 1990-1999 4576M07900
WISECO
$174.95If you're running a Suzuki DR350, piston wear directly impacts compression, throttle response, and fuel efficiency—making a quality replacement essential for reliable performance. The Wiseco Piston Kit delivers OEM-compatible dimensions with optimized...09102905- SKU:
- 09102905
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 349 CC
- BORE SIZE METRIC:
- 79.00 MM
- STROKE LENGTH METRIC:
- 71.20 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit 82.00mm 10.5:1 Suzuki DR350 1990-1999 4576M08200
WISECO
$194.95If you're running a Suzuki DR350 and want to reclaim lost compression or build a higher-output engine, a quality piston kit is non-negotiable. Wiseco pistons are engineered to tighter tolerances than OEM parts, delivering improved combustion efficiency...09102907- SKU:
- 09102907
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- STROKE LENGTH METRIC:
- 71.20 MM
- DISPLACEMENT:
- 349 CC
- BORE SIZE METRIC:
- 82.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +3,00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$194.95 -
Wiseco Piston Kit 83mm 10.5:1 Compression Suzuki DR350 1990-1999 4576M08300
WISECO
$219.95Stock pistons in your DR350 won't cut it if you're pushing higher RPMs or looking for reliable longevity in a frequently-ridden machine. The Wiseco 83mm piston kit delivers the precision fit and material quality you need to maximize engine efficiency...09102908- SKU:
- 09102908
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- +4,00 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 71.20 MM
- BORE SIZE METRIC:
- 83.00 MM
- DISPLACEMENT:
- 349 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$219.95Qty in Cart: 0Quantity:Price:$219.95Subtotal: -
Wiseco Piston Kit Yamaha MX80 1980-1982 1.0mm 222M04800
WISECO
$138.95When your Yamaha MX80 engine is pushing hard on the track or trail, stock pistons won't cut it—you need a component engineered for sustained high-RPM performance and reliability. This Wiseco piston kit delivers the strength and precision necessary to...222M04800- SKU:
- 222M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE SIZE METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$138.95 -
Wiseco Piston Assembly 49.5mm Bore Kawasaki KE100 1986-2000 369M04950
WISECO
$143.95If you're pushing your KE100 hard on the trail or in competition, your stock piston won't cut it. Wiseco's high-silicon alloy construction delivers the strength and thermal stability you need to handle sustained performance without sacrificing...369M04950- SKU:
- 369M04950
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 49.50 MM
- DISPLACEMENT:
- 99 CC
- PISTON DIAMETER METRIC:
- 49.45 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 51.80 MM
$143.95 -
Wiseco Piston Yamaha YZF-R1 2000-2001 50mm 374M06650
WISECO
$154.95If you're rebuilding your 2000-2001 YZF-R1 or pushing it to the limit on track, piston quality directly impacts engine longevity and power delivery. Wiseco's high-silicon alloy construction handles the thermal stress and detonation that come with...374M06650- SKU:
- 374M06650
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 50.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.50 MM
- DISPLACEMENT:
- 172 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.45 MM
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
$154.95 -
WISECO Piston - Yamaha - .50mm 394M08550
WISECO
$209.95A piston is the heart of your engine's combustion cycle, and choosing the right one directly impacts reliability, power delivery, and longevity. Wiseco's forged high-silicon alloy construction delivers the strength needed for both aggressive trail riding...394M08550- SKU:
- 394M08550
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 85.50 MM
- DISPLACEMENT:
- 397 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON DIAMETER METRIC:
- 85.42 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 70.00 MM
$209.95 -
Wiseco Piston Kit 50.00mm Oversize for Suzuki RM80 1977-1981 456M05000
WISECO
$134.95If you're rebuilding a classic Suzuki RM80 or pushing one to the limit on the track, piston wear is inevitable—and worn pistons cost you compression, power, and reliability. The Wiseco 50.00mm oversize piston kit restores your engine to peak performance...456M05000- SKU:
- 456M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 49.95 MM
- BORE SIZE METRIC:
- 50.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 42.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Kit 97.50mm 9:1 Compression Honda XR600R 1985-2000 4577M09750
WISECO
$239.95If you're rebuilding your XR600R engine or pushing higher RPMs, a worn piston directly kills power delivery and increases blowby—costing you reliability and performance. Wiseco's high-silicon alloy construction handles the thermal and mechanical stress...4577M09750- SKU:
- 4577M09750
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- DISPLACEMENT:
- 591 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 97.50 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON DIAMETER METRIC:
- 97.42 MM
- STROKE LENGTH METRIC:
- 80.00 MM
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal:
