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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Wossner Piston Ring 68mm for 1992-1998 Yamaha YZ250 RSB6800
WOSSNER
$18.50Enhance the performance of your 2-stroke engine with the Wossner replacement piston ring, specifically designed for a precise fit with a diameter of 68.00 mm. Crafted with durability in mind, this ring ensures optimal sealing and reduces friction,...09120731- SKU:
- 09120731
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$18.50 -
Wossner Piston Ring 72.50mm for 1999-2006 Polaris 500 Classic RSB7250
WOSSNER
$18.50Piston Ring - 72.50 mm - RSB7250 Enhance your engine's performance with the RSB7250 piston ring, meticulously crafted for Wossner 2-stroke pistons. This high-quality component combines advanced engineering with durable materials to ensure optimal...09120736- SKU:
- 09120736
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$18.50 -
Wossner Universal Small End Bearing 16 mm x 20 mm x 19.5 mm N1013
WOSSNER
$18.50Introducing the Top End Bearing, a premium universal needle bearing designed for exceptional performance and durability. Engineered with precision from high-quality materials, this bearing ensures smooth operation and reliability in various applications...09240452- SKU:
- 09240452
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$18.50 -
VERTEX Engine Rebuild Kit - KTM 250 SXF/CXF WR101-160
VERTEX
$1,315.95Engine Rebuild Kit - KTM 250 SXF/CXF Complete engine rebuild kit, Includes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission bearings, countershaft bushing/seal kit, cam chain...09031261- SKU:
- 09031261
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
$1,315.95 -
VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091
VERTEX
$1,013.95Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 Convenient one-stop shop in a box; nearly all components required for a complete and professional rebuild, Vertex piston kit (standard compression piston, rings, pin and clips), Hot Rods heavy-duty...09031066- SKU:
- 09031066
- Availability:
- Ships Same Business Day
- Weight:
- 15.20 LBS
$1,013.95 -
Wossner Piston Ring Set 97.00mm Yamaha YZ450F 2020-2022 970XSY-3
WOSSNER
$41.50Upgrade your engine's performance with our high-quality Piston Ring Set designed specifically for the Wossner 4-stroke piston. With a precise fit of 97.00 mm, this replacement ring set ensures optimal sealing and enhanced combustion efficiency...09120689- SKU:
- 09120689
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
$41.50 -
MOOSE OFFROAD Cylinder - 66.40 mm - Yamaha MSE20009
MOOSE OFFROAD
$597.95Cylinder - 66.40 mm - Yamaha Precision diamond honed to exact bore dimension and proper surface finish to ensure ring and oil retention, Extremely durable low-friction bore surface allows for greater heat dissipation, Made from cast aluminum; nickel...09311074- SKU:
- 09311074
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
$597.95 -
HOT RODS Crankshaft - OEM Stroke - Polaris HR00046
HOT RODS
$1,104.95Crankshaft - OEM Stroke - Polaris Factory trued and balanced, OEM crankshaft replacement, Crankshaft only, connecting rods sold separately09210888- SKU:
- 09210888
- Availability:
- Ships Same Business Day
- Weight:
- 19.65 LBS
$1,104.95 -
ATHENA Water Pump Gasket Kit - Yamaha P400485475014
ATHENA
$54.95Water Pump Gasket Kit - Yamaha Includes water pump gasket, clutch cover gasket, water pump shaft oil seals, washers and bearings when applicable, Kit contents will vary slightly based on application09347194- SKU:
- 09347194
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$54.95 -
KIBBLEWHITE Spring Kit 30-33600
KIBBLEWHITE
$213.03Spring Kit 30-33600 Enhanced spring rates for improved performance High lift compatibility for optimal engine efficiency Ideal for boosted or turbocharged applications CNC-machined titanium retainers ensure durability Cr-Si dual...09263377- SKU:
- 09263377
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$213.03Qty in Cart: 0Quantity:Price:$213.03Subtotal: -
KIBBLEWHITE Valve Kit - Intake 30-34000
KIBBLEWHITE
$184.09Valve Kit - Intake Full set of Black Diamond* stainless steel standard size valves for engine applications listed, All valves are impregnated by a special process to a depth of .002* with a surface buildup of .0002*, This process improves wear...09263378- SKU:
- 09263378
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$184.09 -
KIBBLEWHITE Valve - Intake - Black Diamond* 30-33612
KIBBLEWHITE
$37.55Valve - Intake - Black Diamond* Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U...09263379- SKU:
- 09263379
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$37.55 -
KIBBLEWHITE Valve - Exhaust - Black Diamond* 30-33616
KIBBLEWHITE
$37.55Valve - Exhaust - Black Diamond* Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U...09263380- SKU:
- 09263380
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
$37.55 -
KIBBLEWHITE Valve Guide - Intake - Standard 30-33620
KIBBLEWHITE
$24.89Valve Guide - Intake - Standard All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistance, Made in the U.S.A.09263381- SKU:
- 09263381
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Intake - +0.010" 30-33629
KIBBLEWHITE
$24.89Valve Guide - Intake - +0.010" All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistance, Made in the U.S.A.09263382- SKU:
- 09263382
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Exhaust - Standard 30-33630
KIBBLEWHITE
$24.89Valve Guide - Exhaust - Standard 30-33630 Constructed from Ampco-45 for exceptional durability and performance. 80% copper content ensures superior heat conductivity. 5% nickel content enhances wear resistance for long-lasting use. ...09263383- SKU:
- 09263383
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Exhaust - +0.010" 30-33639
KIBBLEWHITE
$24.89Valve Guide - Exhaust - +0.010" All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistance, Made in the U.S.A.09263384- SKU:
- 09263384
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$24.89 -
KIBBLEWHITE Spring Kit 40-41600
KIBBLEWHITE
$213.03Spring Kit Spring kit is designed with increased spring rates and high lift compatibility compared to the stock springs, Compatible with boosted or turbocharged applications, CNC-machined titanium retainers and Cr-Si dual springs provide valvetrain...09263385- SKU:
- 09263385
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
$213.03 -
KIBBLEWHITE Valve Kit - Intake 40-41650
KIBBLEWHITE
$168.62Valve Kit - Intake Full set of Black Diamond* stainless steel standard size valves for engine applications listed, All valves are impregnated by a special process to a depth of .002* with a surface buildup of .0002*, This process improves wear...09263386- SKU:
- 09263386
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$168.62 -
KIBBLEWHITE Valve - Intake - White Diamond 40-41612H
KIBBLEWHITE
$31.01Valve - Intake - White Diamond? White Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel or Inconel-751, Electroplated with a 360? anode, to produce an even coat of the highest grade hard chrome finish, Made in the U.S.A.09263387- SKU:
- 09263387
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$31.01
