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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VERTEX Piston Kit - Standard 23375B
VERTEX
$254.95Engine durability and longevity depend on pistons that can withstand extreme combustion pressures and thermal cycling without compromise. The VERTEX Piston Kit 23375B delivers the precision engineering and material science required for reliable...09101002- SKU:
- 09101002
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$254.95 -
VERTEX Piston Ring 53010003950
VERTEX
$25.95Piston rings are wear items that demand replacement to maintain compression, oil control, and engine efficiency. The VERTEX Piston Ring 53010003950 delivers the durability and precision fit your engine needs, whether you're running a two-stroke or...09120346- SKU:
- 09120346
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 90.45 MM
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 90.50 MM
- UNITS:
- SET
$25.95 -
VERTEX Piston Kit - Standard 23429CD
VERTEX
$99.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Standard 23429CD delivers the durability required for sustained boost and aggressive tuning. Built with advanced metallurgy and surface treatments, these...09102065- SKU:
- 09102065
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 50 CC
- PISTON DIAMETER METRIC:
- 39.47 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$99.95 -
VERTEX Piston Kit 24101B
VERTEX
$223.95The VERTEX Piston Kit 24101B delivers the reliability and performance precision you need for consistent power delivery across the entire RPM range. Whether you're rebuilding a tired top end or stepping up displacement and compression, VERTEX pistons are...09104071- SKU:
- 09104071
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 57.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 58 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- CAST REPLICA
$223.95 -
VERTEX Piston Kit - Standard 22387B
VERTEX
$208.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Piston Kit 22387B delivers the durability and precision you need for consistent power delivery and extended engine life. The advanced heat-treatment process and...09101032- SKU:
- 09101032
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$208.95 -
Wiseco Ring Set 47mm Yamaha PW80 1991-2006 1850CD
WISECO
$52.95Piston rings are the critical seal between your combustion chamber and crankcase—worn or inadequate rings kill compression, increase blow-by, and tank engine efficiency. The Wiseco 1850CD ring set is precision-engineered to maintain optimal sealing on...1850CD- SKU:
- 1850CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- SET
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- PISTON RING
$52.95 -
Wiseco Piston Ring Set 47mm Honda CR80R 1986-2002 1850CS
WISECO
$25.95Worn or damaged piston rings kill engine sealing, causing compression loss, blow-by, and poor performance—especially critical in a high-revving 2-stroke like the CR80R. The Wiseco 1850CS ring set restores proper ring-to-bore contact, ensuring consistent...1850CS- SKU:
- 1850CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 82,9 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- 47.00 MM
- UNITS:
- SET
$25.95 -
Wiseco Piston Ring Set 47.5mm for Honda CR80R 1986-2002 1869CS
WISECO
$25.95Keep your CR80R's combustion chamber sealed tight and your oil where it belongs—in the crankcase, not the exhaust. A worn piston ring set kills compression, tanks fuel economy, and accelerates engine wear. The Wiseco 1869CS delivers the precision fit and...1869CS- SKU:
- 1869CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 82,9 CC
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$25.95 -
Wiseco 48mm Piston Ring Set for Honda CR80R 1986-2002 1890CS
WISECO
$25.95A properly sealed combustion chamber is critical for maximizing horsepower and engine longevity on your CR80R. Wiseco's precision-engineered piston ring set delivers the compression consistency and blow-by reduction needed for reliable performance,...1890CS- SKU:
- 1890CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- SET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$25.95 -
Wiseco 48.5mm Piston Ring Set for Kawasaki KX85 2001-2013 1909CD
WISECO
$52.95Worn or damaged piston rings directly compromise combustion sealing, reducing power output and increasing blow-by—both performance killers on the track or trail. The Wiseco 1909CD delivers precision-engineered ring geometry that restores optimal...1909CD- SKU:
- 1909CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 82,9 CC
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$52.95 -
Wiseco Wrist Pin 18mm x 2.200" 1981-1983 Honda CR250R S257
WISECO
$23.95The Wiseco S257 wrist pin is engineered for 1981-1983 Honda CR250R engines that demand reliability under extreme racing conditions. As a critical connecting component between your piston and connecting rod, a high-quality wrist pin directly impacts...S257- SKU:
- S257
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- LENGTH:
- 56 MM
- UNITS:
- EACH
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 18,00 MM
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- LENGTH METRIC:
- 56 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$23.95 -
Wiseco Piston Kit Yamaha DT250 1974-1979 234M07000
WISECO
$210.95If you're running a Yamaha DT250 and want to reliably extract more power from your 2-stroke, a quality piston kit is non-negotiable. The Wiseco 234M07000 delivers the precision fit and durability you need to handle aggressive riding conditions without...234M07000- SKU:
- 234M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 64.00 MM
$210.95 -
Wiseco Piston Yamaha MT-09 2014-2025 Standard 452M07000
WISECO
$199.95If you're running a Yamaha MT-09 and pushing hard on the track or street, a worn piston directly kills your compression, throttle response, and fuel efficiency. The Wiseco 452M07000 restores full performance with CNC-machined precision and forged...452M07000- SKU:
- 452M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.00 MM
- UNITS:
- KIT
$199.95 -
Wiseco Piston Kit Honda XR650L 1993-2017 1mm Oversize 4562M10100
WISECO
$248.95If you're running a Honda XR650L and need to restore lost compression or rebuild after high-mileage wear, a quality piston kit is non-negotiable. The Wiseco 4562M10100 delivers OEM-spec fitment with forged 2618 alloy construction that handles sustained...4562M10100- SKU:
- 4562M10100
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 8.7:1
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 101.00 MM
- DISPLACEMENT:
- 650 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 100.92 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 82.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$248.95 -
Wiseco Piston Kit Racer Elite YZ250F 2014-2016 RE812M07700
WISECO
$369.95If you're pushing your YZ250F to its limits on the track or trail, your stock piston won't cut it. The Wiseco RE812M07700 delivers the compression ratio and durability needed to handle competitive riding without sacrificing reliability. This complete kit...09105076- SKU:
- 09105076
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
$369.95 -
Wiseco Piston Kit 47mm for KTM 85 SX 2003-2025 RE910M04700
WISECO
$171.95If you're running a KTM 85 SX and want reliable power delivery without compromise, a quality piston kit is non-negotiable. The Wiseco RE910M04700 combines precision engineering with proven durability, giving you the thermal stability and ring sealing you...09105085- SKU:
- 09105085
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 47.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- SKIRT COATING:
- ARMORFIT™
$171.95 -
Wiseco Piston Kit 48mm Bore for 2004-2008 Honda CRF80F PK1225
WISECO
$187.95When your CRF80F's factory piston shows wear, you lose compression, responsiveness, and the consistency you need on the track or trail. The Wiseco PK1225 restores full engine potential with a forged-aluminum piston engineered to OEM specifications,...09030173- SKU:
- 09030173
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.00 MM
- BORE SIZE METRIC:
- 48.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 47.97 MM
- PRODUCT NAME:
- REBUILD KIT
$187.95 -
Wiseco Piston Kit 66mm 10:1 Compression Honda XR200R 1986-1991 PK1121
WISECO
$204.95If you're rebuilding your Honda XR200R's top end, piston selection directly impacts throttle response, reliability, and how much power you can extract from the motor. The Wiseco PK1121 delivers the precision engineering and durability expected from a...09030211- SKU:
- 09030211
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- PISTON DIAMETER METRIC:
- 65.95 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 192 CC
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$204.95 -
Wiseco Piston Kit with Gaskets for Suzuki RM85 2002-2020 PK1209
WISECO
$186.95When your RM85's piston shows signs of wear—loss of compression, increased blow-by, or sluggish throttle response—you need a direct replacement that restores factory performance without compromise. The Wiseco PK1209 delivers that reliability with forged...09030214- SKU:
- 09030214
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- DISPLACEMENT:
- 84.7 CC
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 49.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- +2,00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE SIZE METRIC:
- 50.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- STROKE LENGTH METRIC:
- 46.80 MM
$186.95 -
Wiseco Piston Kit for Kawasaki KX80 1991-1997 49mm PK1302
WISECO
$192.95When your KX80's top-end reaches the end of its service life, a quality piston kit is the foundation of a reliable rebuild. The Wiseco PK1302 delivers OEM-equivalent fitment with aerospace-grade materials engineered to handle sustained high-RPM...09030222- SKU:
- 09030222
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 49.00 MM
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 48.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$192.95
