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
-
WORKS CONNECTION Engine Plug - Blue - Gas Gas/Husqvarna/KTM 24-450
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and deterioration, compromising both aesthetics and reliability on your high-performance machine. These WORKS CONNECTION plugs deliver the precision fit and...09500977- SKU:
- 09500977
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$30.95 -
WORKS CONNECTION Engine Plug - Red - Gas Gas/Husqvarna/KTM 24-451
WORKS CONNECTION
$30.95Stock engine plugs invite vibration, corrosion, and a cluttered engine bay. WORKS CONNECTION's precision-machined aluminum plugs deliver a clean aesthetic while protecting critical engine ports with...09500978- SKU:
- 09500978
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
$30.95 -
On Sale
WORKS CONNECTION Engine Plug - Black - Gas Gas/Husqvarna/KTM 24-452
WORKS CONNECTION
MSRP: $30.95Now: $20.00Was: $30.95Stock engine plugs are vulnerable to damage and corrosion, compromising both aesthetics and reliability on your off-road machine. These precision-machined WORKS CONNECTION plugs deliver a...09500979- SKU:
- 09500979
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
MSRP: $30.95Now: $20.00Was: $30.95 -
WORKS CONNECTION Engine Plug - Silver - Gas Gas/Husqvarna/KTM 24-454
WORKS CONNECTION
$29.95Stock engine plugs are prone to corrosion and can detract from an otherwise refined build. These WORKS CONNECTION plugs replace worn or damaged originals with precision-machined aluminum components...09500981- SKU:
- 09500981
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$29.95 -
WORKS CONNECTION Radiator Drain Plug - Silver - Honda/Kawasaki 24-634
WORKS CONNECTION
$23.95Stock plastic radiator drain plugs are prone to cracking and leaking under thermal stress—a problem that can compromise your cooling system and derail race day. The WORKS CONNECTION billet aluminum...09500986- SKU:
- 09500986
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$23.95 -
Wossner Piston Ring 72.50mm for 1999-2006 Polaris 500 Classic RSB7250
WOSSNER
$18.50Worn or damaged piston rings are a direct threat to engine compression, power output, and fuel efficiency—especially critical in 2-stroke engines where ring sealing directly impacts performance. The...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
$18.50Small-end bearing wear is one of the most common failure points in high-performance engine builds, leading to catastrophic rod failure if left unchecked. The Wossner N1013 is a precision needle...09240452- SKU:
- 09240452
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$18.50 -
VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091
VERTEX
$1,064.65When your KTM XC/XC-W 250 or Husqvarna TE250 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates guesswork—you get every critical component in one box instead...09031066- SKU:
- 09031066
- Availability:
- Ships Same Business Day
- Weight:
- 15.20 LBS
$1,064.65 -
MOOSE OFFROAD Cylinder - 66.40 mm - Yamaha MSE20009
MOOSE OFFROAD
$597.95A worn or damaged cylinder compromises ring seal, increases blowby, and degrades power output—issues that ripple through your entire engine. This MOOSE OFFROAD cylinder restores your Yamaha to OEM...09311074- SKU:
- 09311074
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
$597.95 -
HOT RODS Crankshaft - OEM Stroke - Polaris HR00046
HOT RODS
$1,104.95If you're running a Polaris engine that demands reliability on the track or trail, a properly balanced crankshaft is non-negotiable—it's the foundation that keeps your entire rotating assembly in...09210888- SKU:
- 09210888
- Availability:
- Ships Same Business Day
- Weight:
- 19.65 LBS
$1,104.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475014
ATHENA
MSRP: $57.95Now: $49.00Was: $57.95A worn or degraded water pump gasket kit compromises your cooling system's integrity, leading to coolant leaks, overheating, and potential engine damage. The ATHENA Water Pump Gasket Kit for Yamaha...09347194- SKU:
- 09347194
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $57.95Now: $49.00Was: $57.95 -
KIBBLEWHITE Spring Kit 30-33600
KIBBLEWHITE
$213.03If you're running boost or pushing your engine to its limits, valvetrain control becomes non-negotiable. The KIBBLEWHITE Spring Kit 30-33600 delivers the spring rates and component durability needed...09263377- SKU:
- 09263377
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$213.03 -
KIBBLEWHITE Valve Kit - Intake 30-34000
KIBBLEWHITE
$184.09A properly functioning intake valve system is fundamental to engine reliability and performance—worn or substandard valves compromise compression, increase blowby, and accelerate wear on your entire...09263378- SKU:
- 09263378
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
$184.09 -
KIBBLEWHITE Valve - Intake - Black Diamond* 30-33612
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency and engine reliability—particularly under high-RPM racing conditions where standard valves falter. Kibblewhite's Black Diamond valves...09263379- SKU:
- 09263379
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$37.55 -
KIBBLEWHITE Valve - Exhaust - Black Diamond* 30-33616
KIBBLEWHITE
$37.55If you're running high-RPM applications or pushing your engine to its limits, valve quality directly impacts reliability and longevity. The Kibblewhite Black Diamond Exhaust Valve delivers the...09263380- SKU:
- 09263380
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
$37.55 -
KIBBLEWHITE Valve Guide - Intake - Standard 30-33620
KIBBLEWHITE
$24.89Valve guides are critical to maintaining proper valve seat geometry and preventing blow-by that kills performance and reliability. KIBBLEWHITE's Ampco-45 construction ensures superior heat...09263381- SKU:
- 09263381
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Intake - +0.010" 30-33629
KIBBLEWHITE
$24.89Worn valve guides compromise cylinder head integrity and allow oil to seep into the combustion chamber, killing performance and reliability. KIBBLEWHITE intake valve guides are precision-engineered...09263382- SKU:
- 09263382
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Exhaust - Standard 30-33630
KIBBLEWHITE
$24.89Exhaust valve guides experience extreme thermal cycling and abrasive wear—they're critical to maintaining valve sealing integrity and engine longevity. The KIBBLEWHITE Standard 30-33630 uses Ampco-45...09263383- SKU:
- 09263383
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$24.89 -
KIBBLEWHITE Valve Guide - Exhaust - +0.010" 30-33639
KIBBLEWHITE
$22.95Worn or damaged valve guides compromise cylinder head integrity and allow oil to seep into combustion chambers, reducing performance and increasing emissions. KIBBLEWHITE's +0.010" exhaust valve...09263384- SKU:
- 09263384
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$22.95 -
KIBBLEWHITE Spring Kit 40-41600
KIBBLEWHITE
$213.03If you're running a forced induction setup or high-lift cam profile, stock valve springs will cost you reliability and peak power. The KIBBLEWHITE Spring Kit 40-41600 delivers the valvetrain control...09263385- SKU:
- 09263385
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
$213.03
