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
-
On Sale
PROX Crank Bearing and Seal Kit 23.CBS61003
PROX
MSRP: $95.95Now: $76.00Was: $95.95A crankshaft rebuild demands precision-matched components that meet OEM tolerances—this is where corners cannot be cut. The PROX Crank Bearing and Seal Kit 23.CBS61003 delivers factory-spec bearings and seals in a single package, eliminating the...09240360- SKU:
- 09240360
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- BEARING AND SEAL KIT
- TYPE:
- BALL
- APPLICATION:
- CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- 2-STROKE
- UNITS:
- KIT
MSRP: $95.95Now: $76.00Was: $95.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6019
PROX
MSRP: $99.95Now: $81.00Was: $99.95A complete gasket kit is essential for any engine rebuild or top-end refresh, ensuring proper sealing across all critical engine interfaces and preventing costly oil and coolant leaks. The PROX Gasket Kit delivers OEM-equivalent quality with...09345614- SKU:
- 09345614
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
MSRP: $99.95Now: $81.00Was: $99.95Qty in Cart: 0Quantity:Price:MSRP: $99.95Now: $81.00Was: $99.95Subtotal: -
Hinson Racing Engine Plug Kit for 2009-2016 Honda CRF450R EPK489
HINSON RACING
$69.99Engine plug kits are critical wear items that directly impact seal integrity and prevent costly oil leaks in high-stress racing environments. The Hinson Racing Engine Plug Kit replaces factory plugs with precision-machined billet aluminum components that...09500539- SKU:
- 09500539
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- PLUG KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- BILLET ALUMINUM
- TYPE:
- ENGINE
$69.99Qty in Cart: 0Quantity:Price:$69.99Subtotal: -
Hinson Racing Engine Plug Kit for Honda CRF250R 2004-2017 EPK494
HINSON RACING
$69.99Engine dress-up kits might seem cosmetic, but quality billet aluminum plugs protect critical engine ports from debris and corrosion while reducing rotating mass. For Honda CRF250R riders targeting competition or simply maintaining long-term reliability,...09500540- SKU:
- 09500540
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- PLUG KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$69.99Qty in Cart: 0Quantity:Price:$69.99Subtotal: -
Hinson Racing Oil Filler Cap for Honda CR125R 1987-2007 OC154X
HINSON RACING
$19.99Stock plastic oil filler caps fail—they crack under vibration, strip threads, and compromise your engine's seal integrity. The Hinson Racing Oil Filler Cap replaces that weak point with precision-machined T-6 aluminum, delivering the durability and clean...09500614- SKU:
- 09500614
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CAP
- TYPE:
- OIL FILLER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$19.99 -
Hinson Racing Oil Filler Cap Yamaha YZ85 2002-2022 OC213
HINSON RACING
$19.99Your YZ85's engine deserves protection from contamination and your bike deserves better than a plastic filler cap. The Hinson Racing Oil Filler Cap upgrades both durability and aesthetics with T-6 aluminum construction that withstands the demands of...09500615- SKU:
- 09500615
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$19.99 -
Hinson Racing Oil Filler Cap Suzuki RM-Z250 2007-2025 OC230
HINSON RACING
$19.99Stock plastic oil filler caps are prone to cracking and leaking, compromising engine reliability during aggressive riding. The Hinson Racing Oil Filler Cap replaces that weak point with precision-machined T-6 aluminum, delivering durability and a...09500617- SKU:
- 09500617
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- EACH
- COLOR/FINISH:
- POLISHED
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$19.99Qty in Cart: 0Quantity:Price:$19.99Subtotal: -
Hinson Racing Oil Filler Cap for 2003-2018 KTM 250 SX OC255
HINSON RACING
$19.99Your KTM 250 SX deserves components built to withstand the demands of competitive racing, not compromised by plastic that degrades under heat and vibration. The Hinson Racing Oil Filler Cap replaces the stock plastic plug with CNC-precision T-6...09500618- SKU:
- 09500618
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- COLOR/FINISH:
- POLISHED
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$19.99Qty in Cart: 0Quantity:Price:$19.99Subtotal: -
Hinson Racing Billetproof Clutch Cover 2021-2025 Kawasaki KX250 C557-2101
HINSON RACING
$169.99Stock clutch covers on the KX250 struggle to manage heat during sustained racing, leading to premature wear and inconsistent engagement under load. The Hinson Racing Billetproof clutch cover eliminates this weakness with optimized cooling geometry and...09402006- SKU:
- 09402006
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- MODEL:
- BILLETPROOF
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$169.99Qty in Cart: 0Quantity:Price:$169.99Subtotal: -
Hinson Racing Clutch Cover for Honda CRF250R 2018-2026 C794-0817
HINSON RACING
$159.99Stock clutch covers on the CRF250R aren't built for sustained high-rpm riding or the thermal stress of competitive racing. The Hinson Racing Clutch Cover replaces that weakness with billet T-6 aircraft aluminum construction, delivering superior heat...09401724- SKU:
- 09401724
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- T-6 ALUMINUM
$159.99 -
Rekluse Clutch Cover Beta 250 RR 2013-2017 RMS-321
REKLUSE
$189.00The stock clutch cover on your Beta 250 RR is vulnerable to the abuse of off-road riding—impacts from rocks and logs will eventually compromise it. The Rekluse Clutch Cover RMS-321 replaces that weak point with billet aluminum construction that absorbs...09401787- SKU:
- 09401787
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
$189.00Qty in Cart: 0Quantity:Price:$189.00Subtotal: -
Rekluse Clutch Cover Beta 250 RR 2018-2025 RMS-322
REKLUSE
$229.00Trail riding demands components that can withstand repeated impacts without compromising oil circulation—stock clutch covers are notoriously vulnerable to punctures from rocks and debris. The Rekluse billet aluminum clutch cover replaces that weak point...09401788- SKU:
- 09401788
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$229.00Qty in Cart: 0Quantity:Price:$229.00Subtotal: -
REKLUSE Clutch Cover - Beta 350-430RR RMS-323
REKLUSE
$179.00If you're running a Beta 350-430RR in aggressive terrain, your clutch cover needs to withstand constant punishment from rocks, logs, and riding boots without compromising oil retention. The REKLUSE RMS-323 delivers billet aluminum durability with a...09401789- SKU:
- 09401789
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- UNITS:
- EACH
$179.00 -
Rekluse Clutch Cover Sherco 250 SE-R 2018-2025 RMS-324
REKLUSE
$229.00Off-road riding demands clutch protection that won't compromise durability or oil cooling. The Rekluse Clutch Cover for Sherco 250 SE-R delivers billet aluminum construction with increased capacity—giving you enhanced lubrication under aggressive terrain...09401790- SKU:
- 09401790
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
$229.00 -
Rekluse Clutch Cover Beta 350 RR 2011-2017 RMS-323
REKLUSE
$179.00The stock clutch cover on your Beta 350 RR is a vulnerability point during aggressive trail work and high-impact riding. This Rekluse billet aluminum replacement eliminates that weakness while increasing oil capacity for sustained engine cooling and...09401791- SKU:
- 09401791
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$179.00 -
Rekluse Clutch Cover Husaberg FE 390 2010-2012 RMS-327
REKLUSE
$189.00The stock clutch cover on your Husaberg 390 limits oil capacity and offers minimal protection against impact and wear. This Rekluse replacement delivers increased lubrication flow for sustained clutch performance while the billet aluminum construction...09401792- SKU:
- 09401792
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- UNITS:
- EACH
$189.00 -
Rekluse Clutch Cover Husqvarna TC85 2014-2017 RMS-331
REKLUSE
$229.00If you're running a TC85 in competitive or high-intensity riding conditions, the stock clutch cover won't cut it. The Rekluse Clutch Cover RMS-331 replaces that vulnerable plastic with precision-engineered billet aluminum that absorbs impacts from rocks,...09401794- SKU:
- 09401794
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$229.00 -
Rekluse Clutch Cover KTM 450 EXC 2008-2011 RMS-332
REKLUSE
$189.00If you're running a KTM 450 EXC hard in technical terrain, the stock clutch cover becomes a liability—not a feature. The Rekluse RMS-332 replaces that vulnerable component with billet aluminum engineered to absorb impacts from rocks and logs while...09401795- SKU:
- 09401795
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
$189.00 -
Rekluse Clutch Cover KTM 450 SX-F 2012-2016 RMS-334
REKLUSE
$229.00If you're running a KTM 450 SX-F, your clutch cover takes a beating—rocks, logs, and high-speed impacts are part of the game. The Rekluse RMS-334 replaces that vulnerable OEM plastic with billet aluminum that actually absorbs punishment while maintaining...09401796- SKU:
- 09401796
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$229.00 -
Rekluse Clutch Cover KTM 250 SX-F 2024 RMS-335
REKLUSE
$229.00The stock clutch cover on your 2024 KTM 250 SX-F is your first line of defense against impact damage and premature wear. A billet aluminum replacement with increased oil capacity keeps your clutch system cooler and more reliable during aggressive riding,...09401797- SKU:
- 09401797
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
$229.00
