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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Rekluse Clutch Cover KTM 250 EXC 2004-2012 300 EXC 2004-2007 RMS-336
REKLUSE
$229.00Trail riding demands a clutch cover that can handle repeated impacts while maintaining consistent oil cooling and lubrication. The Rekluse RMS-336 delivers both durability and performance by...09401798- SKU:
- 09401798
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
$229.00 -
Rekluse Clutch Cover Husqvarna TC 125 2014-2015 RMS-337
REKLUSE
$229.00The stock clutch cover on your Husqvarna TC 125 is vulnerable to trail damage and limited in oil capacity. Rekluse's billet aluminum cover delivers superior impact protection while increasing cooling...09401799- SKU:
- 09401799
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
$229.00 -
Rekluse Clutch Cover KTM 250 SX-F 2015 RMS-338
REKLUSE
$229.00The stock clutch cover on your KTM 250 SX-F is vulnerable to damage from impacts and inadequate in oil capacity for sustained performance. The Rekluse clutch cover RMS-338 replaces it with a billet...09401800- SKU:
- 09401800
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$229.00 -
Rekluse Clutch Cover Kawasaki KX85 1998-2025 RMS-342
REKLUSE
$229.00The stock clutch cover on your KX85 is vulnerable to trail damage that compromises both protection and oil retention. The Rekluse billet aluminum clutch cover eliminates this liability with a...09401802- SKU:
- 09401802
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$229.00 -
Rekluse Clutch Cover Husqvarna TC 250 2010-2012 RMS-355
REKLUSE
$179.00Protect your clutch cover from impact damage while improving engine cooling and lubrication with this purpose-built billet aluminum replacement. The Rekluse design increases oil capacity beyond OEM...09401805- SKU:
- 09401805
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
$179.00 -
Rekluse Clutch Cover Husqvarna TC 450 2006-2010 RMS-356
REKLUSE
$229.00The stock clutch cover on your Husqvarna TC 450 is vulnerable to impact damage that can compromise oil containment and engine protection. This Rekluse billet aluminum replacement addresses that...09401806- SKU:
- 09401806
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$229.00 -
Rekluse Clutch Cover Honda CR250R 1992-2001 RMS-369
REKLUSE
$229.00The stock clutch cover on your CR250R limits oil capacity, compromising cooling and lubrication under sustained high-rpm riding. This billet aluminum Rekluse replacement increases oil volume for...09401809- SKU:
- 09401809
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$229.00 -
Rekluse Clutch Cover Husqvarna FC 450 2016-2021 RMS-380
REKLUSE
$229.00Your clutch cover takes a beating on demanding terrain—dirt, rocks, water crossings, and constant vibration all conspire to compromise protection and performance. The Rekluse RMS-380 addresses this...09401816- SKU:
- 09401816
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
$229.00 -
Rekluse Clutch Cover Husqvarna TE 250 2014-2016 RMS-386
REKLUSE
$229.00Trail riding puts serious stress on your clutch cover—rocks, logs, and impacts can crack or damage inferior designs, leaving you stranded. The Rekluse RMS-386 replaces that vulnerability with billet...09401817- SKU:
- 09401817
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
$229.00 -
Hiflofiltro Oil Filter for Kawasaki KLR650 1987-2025 HF123
HIFLOFILTRO
$4.39Engine protection starts with filtration. The Hiflofiltro HF123 traps harmful contaminants before they compromise bearing surfaces and cylinder walls, while maintaining the oil flow rate your KLR650...HF123- SKU:
- HF123
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BASE COLOR:
- RED
- PRODUCT NAME:
- OIL FILTER
- LENGTH METRIC:
- 57 MM
- STYLE:
- PREMIUM
- WIDTH METRIC:
- 55 MM
$4.39 -
Hiflofiltro Oil Filter for Suzuki DR350 1990-1999 HF136
HIFLOFILTRO
$5.18Proper oil filtration is critical to engine longevity, and the Hiflofiltro HF136 delivers reliable protection for your DR350. This OEM-equivalent filter removes contaminants and maintains consistent...HF136- SKU:
- HF136
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- COLOR/FINISH:
- RED
- UNITS:
- EACH
- WIDTH METRIC:
- 60 MM
- BASE COLOR:
- RED
- LENGTH METRIC:
- 33 MM
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- PREMIUM
$5.18 -
HifloFiltro Oil Filter for Kawasaki KX250F 2004-2020 HF207
HIFLOFILTRO
$5.00A quality oil filter is non-negotiable for maintaining engine longevity and performance on your KX250F. The HifloFiltro HF207 delivers superior filtration efficiency to keep contaminants out of...07120028- SKU:
- 07120028
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STYLE:
- PREMIUM
- BASE COLOR:
- RED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 44 MM
- PRODUCT NAME:
- OIL FILTER
- WIDTH METRIC:
- 38 MM
- TYPE:
- CARTRIDGE
$5.00 -
Hiflofiltro Oil Filter for Yamaha YFZ450R 2009-2019 HF140
HIFLOFILTRO
$5.32The Hiflofiltro HF140 delivers reliable engine protection where it matters most—keeping contaminants out of your YFZ450R's oil system so you can focus on performance. Built to OEM or better...07120297- SKU:
- 07120297
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BASE COLOR:
- YELLOW
- STYLE:
- PREMIUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- WIDTH METRIC:
- 38 MM
- COLOR/FINISH:
- YELLOW
- LENGTH METRIC:
- 46 MM
- RIDING STYLE:
- OFF-ROAD
$5.32 -
Hiflofiltro Oil Filter for KTM 250 EXC Racing 2003-2006 HF157
HIFLOFILTRO
$5.82Keep your KTM 250 EXC running at peak performance with proven filtration that protects your engine under the demands of competitive racing and aggressive trail riding. The HF157 delivers...HF157- SKU:
- HF157
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- YELLOW
- RIDING STYLE:
- OFF-ROAD
- WIDTH METRIC:
- 41 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- BASE COLOR:
- YELLOW
- STYLE:
- PREMIUM
- LENGTH METRIC:
- 52 MM
- PRODUCT NAME:
- OIL FILTER
$5.82 -
Hiflofiltro Oil Filter for Yamaha SR400 2015-2018 HF145
HIFLOFILTRO
$5.18Keep your SR400's engine running clean and protected with the Hiflofiltro HF145—a purpose-built oil filter that delivers the reliable filtration your air-cooled single-cylinder demands...HF145- SKU:
- HF145
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BASE COLOR:
- RED
- STYLE:
- PREMIUM
- WIDTH METRIC:
- 55 MM
- PRODUCT NAME:
- OIL FILTER
- LENGTH METRIC:
- 58 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
$5.18 -
HifloFiltro Oil Filter for Yamaha Majesty 400 2004-2014 HF132
HIFLOFILTRO
$3.97Keep your Yamaha Majesty 400's engine running clean and protected with the HifloFiltro HF132 oil filter. Built to OEM specifications, this premium filter traps contaminants effectively while...HF132- SKU:
- HF132
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BASE COLOR:
- RED
- LENGTH METRIC:
- 55 MM
- UNITS:
- EACH
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- STYLE:
- PREMIUM
- WIDTH METRIC:
- 44 MM
- PRODUCT NAME:
- OIL FILTER
$3.97 -
Hiflofiltro Oil Filter for KTM 690 Duke 2008-2019 HF155
HIFLOFILTRO
$5.82Regular oil filter changes are non-negotiable for engine longevity, especially on high-revving single-cylinder bikes like the KTM 690 Duke. The HIFLOFILTRO HF155 delivers OEM-equivalent filtration...HF155- SKU:
- HF155
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- LENGTH METRIC:
- 69 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- COLOR/FINISH:
- ORANGE
- WIDTH METRIC:
- 41 MM
- BASE COLOR:
- ORANGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- PREMIUM
- UNITS:
- EACH
$5.82 -
Hiflofiltro Oil Filter for Honda CB1000 1994-1995 HF303
HIFLOFILTRO
$8.71Proper oil filtration is critical to engine longevity, especially in high-performance applications where engine stress demands reliable protection. The Hiflofiltro HF303 delivers OEM-equivalent or...HF303- SKU:
- HF303
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BASE COLOR:
- BLACK
- LENGTH METRIC:
- 73 MM
- STYLE:
- PREMIUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- WIDTH METRIC:
- 65 MM
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SPIN-ON
- COLOR/FINISH:
- BLACK
$8.71 -
On Sale
VERTEX Piston Kit 24220B
VERTEX
MSRP: $269.95Now: $173.00Was: $269.95The VERTEX Piston Kit 24220B delivers the durability and precision your engine demands, whether you're pushing peak RPMs on the track or rebuilding after hard use. Built with advanced metallurgy and...09105190- SKU:
- 09105190
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- DISPLACEMENT:
- 250 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 76.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
MSRP: $269.95Now: $173.00Was: $269.95 -
VERTEX Piston Kit 24101A
VERTEX
$223.95The VERTEX Piston Kit 24101A delivers the precision engineering and durability demanded by serious racers and high-performance builders. Whether you're rebuilding a worn engine or pushing...09104070- SKU:
- 09104070
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 58 MM
- PISTON DIAMETER METRIC:
- 57.94 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$223.95
