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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SHINDY Needle Bearing - 18 mm x 22 mm x 22 mm 10-001
SHINDY
$9.95Piston pin needle bearings are critical to engine reliability, especially in high-RPM racing applications where precision tolerances and durability directly impact performance. This SHINDY bearing...NB1457- SKU:
- NB1457
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 22 MM
- RIDING STYLE:
- UTV
- LENGTH:
- 22 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER:
- 18 MM
- INSIDE DIAMETER METRIC:
- 18 MM
- OUTSIDE DIAMETER:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 22 MM
- TYPE:
- NEEDLE
$9.95 -
SHINDY Needle Bearing - 15 mm x 19 mm x 17 mm 10-053
SHINDY
$8.95Piston pin needle bearings are critical components that directly impact engine reliability and performance—especially under high RPM conditions where precision and durability are non-negotiable. The...NB1458- SKU:
- NB1458
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER:
- 15 MM
- INSIDE DIAMETER METRIC:
- 15 MM
- LENGTH:
- 17 MM
- OUTSIDE DIAMETER METRIC:
- 19 MM
- UNITS:
- EACH
- LENGTH METRIC:
- 17 MM
- OUTSIDE DIAMETER:
- 19 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- TYPE:
- NEEDLE
$8.95 -
SHINDY Needle Bearing - 15 mm x 19 mm x 20 mm 10-152
SHINDY
$9.95Piston pin needle bearings are critical to engine reliability, especially in high-RPM or forced-induction applications where precision clearances are non-negotiable. The SHINDY 10-152 is manufactured...NB1459- SKU:
- NB1459
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH:
- 20 MM
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER:
- 19 MM
- PRODUCT NAME:
- BEARING
- INSIDE DIAMETER:
- 15 MM
- INSIDE DIAMETER METRIC:
- 15 MM
- OUTSIDE DIAMETER METRIC:
- 19 MM
- UNITS:
- EACH
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 20 MM
- TYPE:
- NEEDLE
$9.95 -
SHINDY Needle Bearing - 15 mm x 20 mm x 18 mm 10-354
SHINDY
$14.95Piston pin needle bearings are critical to engine reliability and performance—they handle the precise lateral loads that occur thousands of times per minute during combustion cycles. The SHINDY...NB1460- SKU:
- NB1460
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH:
- 18 MM
- OUTSIDE DIAMETER:
- 20 MM
- INSIDE DIAMETER:
- 15 MM
- INSIDE DIAMETER METRIC:
- 15 MM
- LENGTH METRIC:
- 18 MM
- OUTSIDE DIAMETER METRIC:
- 20 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- PISTON
- PRODUCT NAME:
- BEARING
- TYPE:
- NEEDLE
$14.95 -
SHINDY Needle Bearing - 14 mm x 18 mm x 17.5 mm 10-252
SHINDY
$8.95Piston pin needle bearings are critical to engine reliability—they manage radial loads and reduce friction at one of the most dynamic points in your engine's combustion cycle. A worn or damaged...NB1462- SKU:
- NB1462
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- NEEDLE
- INSIDE DIAMETER:
- 14 MM
- INSIDE DIAMETER METRIC:
- 14 MM
- LENGTH:
- 17,5 MM
- LENGTH METRIC:
- 17.5 MM
- UNITS:
- EACH
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER:
- 18 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$8.95Qty in Cart: 0Quantity:Price:$8.95Subtotal: -
SHINDY Needle Bearing - 14 mm x 18 mm x 16.5 mm 10-353
SHINDY
$7.95Piston pin needle bearings are critical to engine reliability, especially in high-RPM and forced-induction applications where precision tolerances directly impact performance and longevity. SHINDY's...NB1464- SKU:
- NB1464
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- INSIDE DIAMETER METRIC:
- 14 MM
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER:
- 18 MM
- PRODUCT NAME:
- BEARING
- LENGTH METRIC:
- 16.5 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- NEEDLE
- UNITS:
- EACH
- APPLICATION:
- PISTON
- INSIDE DIAMETER:
- 14 MM
- LENGTH:
- 16,5 MM
$7.95 -
SHINDY Piston Pin Bearing 10-351
SHINDY
$10.95Piston pin needle bearings are critical to engine reliability, directly affecting crankshaft longevity and combustion efficiency. The SHINDY 10-351 delivers precision manufacturing with minimal...09240006- SKU:
- 09240006
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- PISTON
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 23 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- LENGTH:
- 22 MM
- OUTSIDE DIAMETER:
- 23 MM
- TYPE:
- NEEDLE
- UNITS:
- EACH
- INSIDE DIAMETER:
- 18 MM
- INSIDE DIAMETER METRIC:
- 18 MM
- LENGTH METRIC:
- 22 MM
$10.95 -
MOOSE RACING Top End Gasket Kit - YZ 250 810663
MOOSE RACING
$27.72A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals and a complete set...M810663- SKU:
- M810663
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$27.72Qty in Cart: 0Quantity:Price:$27.72Subtotal: -
MOOSE RACING Top End Gasket Kit - YZ 250 810664
MOOSE RACING
$21.90A top-end rebuild demands precision—gaskets that seal tight, materials that last, and the confidence that every component fits exactly as engineered. The MOOSE RACING Top End Gasket Kit delivers...M810664- SKU:
- M810664
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$21.90 -
MOOSE RACING Top End Gasket Kit - YZ 250 810665
MOOSE RACING
$29.14A top-end rebuild demands precision seals and gaskets that won't compromise your engine's integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality replacement seals at a...M810665- SKU:
- M810665
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$29.14Qty in Cart: 0Quantity:Price:$29.14Subtotal: -
MOOSE RACING Top End Gasket Kit - YZ 250 810666
MOOSE RACING
$36.47A top-end rebuild demands precision—every gasket, seal, and O-ring must fit perfectly to maintain compression, prevent leaks, and deliver consistent performance. The MOOSE RACING Top End Gasket Kit...M810666- SKU:
- M810666
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$36.47 -
MOOSE RACING Top End Gasket Kit - YZ 250 810668
MOOSE RACING
$36.47When you're rebuilding a YZ 250 top end, gasket and seal integrity directly impacts compression, oil containment, and overall engine reliability. The MOOSE RACING Top End Gasket Kit eliminates the...M810668- SKU:
- M810668
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$36.47Qty in Cart: 0Quantity:Price:$36.47Subtotal: -
MOOSE RACING Top End Gasket Kit - YZ 250 810670
MOOSE RACING
$35.14A top-end rebuild demands precision—using OEM-quality seals and gaskets ensures your YZ 250 runs reliably without the premium OEM price tag. This complete kit eliminates the guesswork of sourcing...M810670- SKU:
- M810670
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$35.14 -
MOOSE RACING Motor Gasket Kit with Seal - 600 Grizzly 811833
MOOSE RACING
$178.30A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising on these components invites leaks, contamination, and catastrophic failure. The MOOSE RACING Motor...M811833- SKU:
- M811833
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$178.30 -
MOOSE RACING Motor Gasket Kit with Seal - LT250R 811834
MOOSE RACING
$50.74A complete engine and transmission rebuild demands precision gaskets and seals that fit right the first time—cutting corners here compromises both performance and reliability. The MOOSE RACING Motor...M811834- SKU:
- M811834
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
$50.74 -
MOOSE RACING Motor Gasket Kit with Seal - LT500R 811835
MOOSE RACING
$80.18A complete engine and transmission rebuild demands precision-fit gaskets and seals—cheap replacements lead to leaks, lost compression, and catastrophic failure. The MOOSE RACING Motor Gasket Kit...M811835- SKU:
- M811835
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
$80.18Qty in Cart: 0Quantity:Price:$80.18Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - Trail Boss/Magnum 811836
MOOSE RACING
$100.84A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or your budget. This MOOSE RACING kit eliminates the guesswork of sourcing...M811836- SKU:
- M811836
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- TYPE:
- ENGINE
$100.84 -
MOOSE RACING Motor Gasket Kit with Seal - DS650 811853
MOOSE RACING
$156.18A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your budget. MOOSE Racing delivers OEM-equivalent quality at a fraction of dealership...M811853- SKU:
- M811853
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$156.18 -
MOOSE RACING Motor Seals - CRF450R 822352
MOOSE RACING
$60.56Engine rebuilds demand precision—OEM-quality seals at a fraction of the cost. MOOSE Racing motor seals are engineered from high-tech materials to deliver the same reliability you'd expect from...09350399- SKU:
- 09350399
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SEAL
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$60.56 -
MOOSE RACING Inner Clutch Cover Gasket 816020
MOOSE RACING
$14.33A failing clutch cover gasket can compromise your engine's oil containment and lead to costly sealing failures during critical race conditions. The MOOSE RACING Inner Clutch Cover Gasket delivers...09346116- SKU:
- 09346116
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$14.33
