2003 HARLEY-DAVIDSON Engines & Components

Hastings Premium Ductile Ring Sets

Whether it's a car, truck, motorcycle, marine, or performance racing application—properly sealing the piston to the engine block is a requirement. Hastings premium ductile ring sets do just that, and they're offered in many different options to fit virtually any piston. If the engine you're working on is blowing smoke, using excessive oil, or at a loss for power, it may be time for new rings. These premium ductile piston ring sets are great for rebuilds or new builds, daily drivers or performance vehicles. Order the sizes needed for your project.

4.51 out of 5 stars ( 155 )

$50.99

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$72.99

S&S Cycle Cylinder Studs

S&S Cycle cylinder studs are the perfect replacement for your OEM or S&S cases. These steel head studs are black oxide coated and strong enough to use on the largest of V-twin engines. So next time you do a top end on your Harley-Davidson®, update those head studs with S&S cylinder studs.

5.0 out of 5 stars ( 1 )

$99.95

Summit Bucks

Russell Twin Cam Vent Lines

Russell twin cam vent lines are designed to replace the OEM rubber vent hose that runs from your engine crankcase to the transmission housing.

Not Yet Reviewed

$65.99

Feuling Parts Outer Camshaft Bearings

Feuling Parts outer camshaft bearing kits include a ball bearing-style front camshaft bearing and a roller bearing-style rear camshaft bearing with race. Their outer cam bearings readily accept the higher loads and demands of performance engines. Feuling Parts supplies only the best bearings available.

Not Yet Reviewed

$50.95

S&S Cycle Moly Faced Piston Rings

If you are modifying your Harley® for increased horsepower or aggressive riding, S&S Cycle's Moly faced piston rings can be a good choice. The Moly coating material provides excellent friction reduction properties and can withstand high temperatures better than many other ring coatings, making it suitable for high-performance engines. The porous nature of the Moly coating helps to hold oil on the ring face, providing better lubrication during initial engine start-up and under heavy load. Moly rings often break-in more easily than other types of rings due to their coating properties. Even for everyday riding, Moly rings can offer improved engine longevity if you frequently push your bike hard. Order the Moly faced piston rings designed for your HD® model's engine type.

Not Yet Reviewed

$67.95

Wiseco 4-Stroke Piston Rings

Manufactured to the highest standards to outperform the competition, Wiseco 4-stroke piston rings maximize your performance and keep you firing on all cylinders. These rings are crafted from various metals and with specific finishes for both street and track. Designed to underscore piston lubrication, reduce bore friction, and optimize the heart of your engine, Wiseco rings improve the overall function of your pistons and powerplant. The 4-stroke rings are intended for use in cast iron, NikaSil, boron composite, and electrofusion bores; certain rings are designed for limited coatings, such as the XJ with chrome bores and the XN with NikaSil bores. Match up the specs from your motorcycle with the size and type of piston ring replacements you need. You can always depend on race-proven Wiseco technology!

4.5 out of 5 stars ( 16 )

$56.99