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 Ring Set 70mm for Honda CR250R 1978-1980 2756CD
WISECO
$52.95If you're rebuilding a classic Honda CR250R two-stroke, ring seal directly impacts combustion efficiency, power delivery, and engine longevity. Wiseco's 70mm ring set is precision-engineered to maintain consistent compression across the full RPM range,...2756CD- SKU:
- 2756CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- SET
- BORE SIZE METRIC:
- 70.00 MM
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 693 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco Ring Set 69mm 1974-1975 Arctic Cat Cheetah 440 2717CD
WISECO
$52.95Piston ring sets are critical to engine sealing and compression efficiency—worn or incorrect rings lead to blow-by, oil consumption, and power loss. The Wiseco 2717CD is precision-engineered specifically for 1974-1975 Arctic Cat Cheetah 440 applications,...2717CD- SKU:
- 2717CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 69.00 MM
- RIDING STYLE:
- SNOW
- DISPLACEMENT:
- 436 CC
- RIDING STYLE:
- ATV
$52.95 -
Wiseco 2 Cycle Piston Ring Set 70.75mm Honda CR250R 1978-1980 2786CD
WISECO
$52.95Worn piston rings kill compression, tank power, and waste fuel—especially on high-revving 2-cycle engines like the CR250R. The Wiseco 2786CD ring set restores the sealed combustion chamber your engine demands, delivering crisp throttle response and...2786CD- SKU:
- 2786CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 248 CC
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 70.75 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$52.95 -
Wiseco Ring Set 66.4mm Honda CR250R 1986-2007 2614CD
WISECO
$52.95Piston ring degradation is one of the primary causes of compression loss and increased blow-by in 2-stroke engines—both of which directly impact power delivery and fuel efficiency. The Wiseco 2614CD Ring Set restores proper ring-to-groove fit and...2614CD- SKU:
- 2614CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- SET
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 249 CC
$52.95 -
Wiseco 54mm Piston Ring Set for KTM 125 SX 2001-2020 2126CD
WISECO
$52.95Piston rings are critical to engine sealing and compression—worn or damaged rings will cause blow-by, oil consumption, and power loss. The Wiseco 54mm Piston Ring Set 2126CD delivers the precision fit and material quality your KTM 125 SX demands, whether...2126CD- SKU:
- 2126CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 54.00 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$52.95 -
Wiseco Ring Set 54.50mm Honda CR125R 1992-2003 Kawasaki KX100 2014-2020 2146CS
WISECO
$25.95Worn or substandard piston rings directly compromise compression, throttle response, and fuel efficiency—making ring replacement one of the highest-impact upgrades for two-stroke performance. The Wiseco 2146CS ring set delivers precision fitment and...2146CS- SKU:
- 2146CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 54.50 MM
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$25.95 -
Wiseco 55.50mm Piston Ring Set for Honda CR125R 1980-1986 Suzuki RM125 1977-1986 2185CD
WISECO
$52.95Worn or damaged piston rings directly compromise compression, increase blow-by, and reduce power output—especially critical in high-revving two-stroke engines like the CR125R and RM125. The Wiseco 2185CD ring set restores factory-spec sealing with...2185CD- SKU:
- 2185CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 55.50 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 120 CC
- UNITS:
- SET
$52.95 -
Wiseco Ring Set 56.00mm for Honda CR125R 1985-1986 2205CD
WISECO
$52.95Piston ring wear is one of the fastest ways to lose compression, power, and fuel efficiency in a two-stroke engine. The Wiseco Ring Set 2205CD delivers the precision fit and high-temperature durability your Honda CR125R needs to maintain peak...2205CD- SKU:
- 2205CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 124 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 120 CC
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$52.95 -
Wiseco 56mm Ring Set for Yamaha YZ125 1989-2024 2205CS
WISECO
$25.95Piston ring sets are critical to engine longevity—they seal combustion pressure, regulate oil consumption, and prevent blow-by that robs power and damages your engine. The Wiseco 2205CS ring set is engineered to OEM specifications for the YZ125, ensuring...2205CS- SKU:
- 2205CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 125 CC
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$25.95 -
Wiseco 87mm Ring Set for Honda XR400R 1996-2004 3425XC
WISECO
$52.95If you're rebuilding or hot-rodding your XR400R, ring seal directly impacts compression, fuel efficiency, and overall engine reliability. A worn or improper ring set leads to blow-by, loss of power, and premature engine wear—this Wiseco set eliminates...3425XC- SKU:
- 3425XC
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 87.00 MM
- PISTON MATERIAL:
- ALUMINUM
$52.95 -
Wiseco Ring Set 86.50mm Kawasaki KX500 1988-2004 3405TD
WISECO
$57.95Worn or damaged piston rings are a silent killer of engine performance—they bleed compression, spike oil consumption, and rob you of power just when you need it most. The Wiseco Ring Set 3405TD delivers OEM-grade sealing with enhanced durability,...3405TD- SKU:
- 3405TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 86.50 MM
- RIDING STYLE:
- ATV
- UNITS:
- SET
$57.95 -
Wiseco 83mm Piston Ring Set for Kawasaki ZX-12R 2000-2005 3268XG
WISECO
$52.95Proper ring sealing is critical for maintaining compression, controlling blow-by, and maximizing power output in your ZX-12R engine. This Wiseco ring set delivers precision-engineered sealing surfaces that withstand the extreme combustion pressures and...3268XG- SKU:
- 3268XG
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 83.00 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$52.95 -
Wiseco Piston Kit Suzuki DR650S 1990-1993 4597M09600
WISECO
$239.95Stock pistons lose efficiency and durability under demanding riding conditions—whether you're pushing your DR650S on technical trails or logging highway miles. The Wiseco piston kit restores and exceeds OEM performance through precision forging and...09101659- SKU:
- 09101659
- Availability:
- Ships Same Business Day
- Weight:
- 1.27 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 654 CC
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 90.40 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 96.00 MM
- PISTON MATERIAL:
- FORGED
$239.95 -
Wiseco Piston Kit Yamaha XT500 1976-1981 87.50mm 9:1 4764M08750
WISECO
$239.95Your XT500 or TT500 demands a piston engineered for reliability under sustained high RPM and load—factory units wear quickly in demanding riding conditions. The Wiseco 4764M08750 kit delivers a high-silicon alloy construction that resists thermal stress...09101666- SKU:
- 09101666
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- BORE - OVERSIZE METRIC:
- +0.05 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 505 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +0,05 MM
- BORE SIZE METRIC:
- 87.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 84.00 MM
- UNITS:
- EACH
$239.95 -
Wiseco 200 EXC 1998-2002 Piston Kit with Gaskets PK1369
WISECO
$269.95If you're rebuilding your KTM 200 EXC or MXC, engine wear directly impacts throttle response and reliability. Wiseco's forged piston kit restores lost compression and power while the included gasket set ensures a clean, sealed rebuild without additional...09030512- SKU:
- 09030512
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 64.00 MM
- PISTON DIAMETER METRIC:
- 63.95 MM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 60.00 MM
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
$269.95 -
Wiseco Piston Kit Yamaha YZ85 2002-2021 5.50mm Oversize 767M05250
WISECO
$177.95If you're running a Yamaha YZ85 hard—whether on the track or in practice—piston wear directly impacts power delivery and reliability. The Wiseco 767M05250 is engineered to restore lost compression and add measurable performance gains while handling the...09100366- SKU:
- 09100366
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE - OVERSIZE METRIC:
- +5.50 MM
- DISPLACEMENT:
- 103,5 CC
- STROKE LENGTH METRIC:
- 47.80 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- UNITS:
- EACH
- BORE - OVERSIZE:
- +5,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
$177.95 -
Wiseco Piston Kit 47.50mm 11:1 Yamaha TT-R90 2003 4840M04750
WISECO
$160.95If you're running a Yamaha TTR90 and want measurable gains in power and throttle response, a high-compression piston kit is one of the most direct upgrades available. The Wiseco 47.50mm 11:1 kit delivers a noticeable bump in output while maintaining the...09100369- SKU:
- 09100369
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 92 CC
- STROKE LENGTH METRIC:
- 51.80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit Standard Yamaha XT 350 1985-2000 4674M08700
WISECO
$199.95If you're running a Yamaha XT350 or TT350 and want reliable power gains without compromising engine longevity, a quality piston kit is essential. The Wiseco Piston Kit Standard delivers measurable improvements in combustion efficiency and responsiveness...09101661- SKU:
- 09101661
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BORE SIZE METRIC:
- 87.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 354 CC
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 59.60 MM
$199.95 -
Wiseco Piston Kit 0.50mm Oversize for 2004-2013 Honda CRF80F 4665M04800
WISECO
$160.95If you're rebuilding your Honda 80cc engine or pushing it to its limits on the track, a quality piston kit is fundamental to reliability and performance. The Wiseco 0.50mm oversize piston restores your engine to like-new compression while delivering...09100324- SKU:
- 09100324
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 81 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
$160.95 -
Wiseco Piston Kit 78mm 10.5:1 Compression for 1986-2004 Honda XR250R 4466M07800
WISECO
$238.95If you're running a Honda XR250R or XR250L and want measurable gains in power and throttle response, a quality piston kit is one of the most direct upgrades you can make. The Wiseco 78mm 10.5:1 compression kit increases combustion efficiency and...09100755- SKU:
- 09100755
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +5,00 MM
- BORE SIZE METRIC:
- 78.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +5.00 MM
- PRODUCT NAME:
- PISTON
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 59.50 MM
- UNITS:
- EACH
$238.95
