2003 HARLEY-DAVIDSON Engines & Components

KB Performance V-Twin Piston and Ring Kits

KB Performance V-Twin piston and ring kits bring all of the knowledge and experience of a legendary engine builder to the world of high performance motorcycles. These pistons use the latest manufacturing techniques and standards to ensure quality and maximum available performance. The kits are offered in hypereutectic 390 alloy and forged 4032 low-expansion alloy. KB Performance V-Twin piston and ring kits are available for Harley-Davidson® and Indian motorcycles in a variety of engine sizes and compression ratios.

4.8 out of 5 stars ( 20 )

$150.12

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$221.29

S&S Cycle Street Performance .585 Valve Spring Kits

S&S Cycle offers Street Performance .585 in. valve spring kits to upgrade your bike's performance—so you don't have just another "me too" motorcycle. Order the valve spring kit designed for your make and model. Features and specifications: * Available for fitment on a variety of Harley-Davidson® and Buell models * Kit contains springs, top and bottom collars, keepers, and shims * Accommodates camshaft lift to 0.585 inches * Suitable for high performance applications * Coil springs reduce the risk of valve float

Not Yet Reviewed

$163.95

Feuling Parts HP+ Lifters

Feuling Parts HP+ lifters are a great performance upgrade for your motorcycle--as the name implies, they're "Horsepower Plus!" Hydraulic roller lifters provide optimized (and cooler) oil flow to top-end valves, springs, rockers, shafts, and valve guides. The rollers reduce friction between the lifters and camshaft, extending the life of your valvetrain gear. HP+ lifters are CNC-machined, precision-ground, drop-in replacements for your stock lifters. They've been dyno-developed and track-tested for use with the Feuling oil pump or comparable high-volume models. HP+ lifters are available to fit a variety of bike makes and models, including Buell and Harley-Davidson®.

Not Yet Reviewed

$203.95

Wiseco Tracker Series Pistons

Wiseco offers Tracker Series pistons for a variety of applications, including many Honda©, Kawasaki, KTM, Husqvarna, Gas Gas, Suzuki, and Yamaha off-road bikes and ATVs from 2006 and up. At the end of the day, it's all about the freedom riding gives us, which is why Wiseco believes the reliability and performance benefits of forged pistons shouldn't have to break the budget. Enter Tracker Series, a no-frills line of pistons for Harley-Davidson© engines designed to offer the forged strength Wiseco is known for at a mid-level price point. With multiple configurations available for different Harley© engine platforms, Tracker Series pistons will get you to the checkers. Additional product details: * Proprietary near-net forging technology reduces the amount of finish machining required, offering lower cost without sacrificing strength and longevity * ArmorFit skirt coating reduces operating friction and increases wear resistance for a better performing, longer lasting part * Supplied in kits containing pistons, rings, wrists pins, and circlips all under one part number * Ring sets include 3mm oil ring assembly, providing better oil control for consistent cylinder lubrication and reduced blow-by, resulting in improved durability and performance

Not Yet Reviewed

$122.99

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$241.99

COMP Cams High Performance Valve Spring Kits

Simplify your valvetrain assembly! COMP Cams high performance valve spring kits have everything that you need for a complete valve spring assembly. Springs and retainers are included, along with complete instructions for a worry-free installation.

4.68 out of 5 stars ( 34 )

$145.95

On Sale

Moroso PCV Air/Oil Separators

Moroso PCV air/oil separators will help increase your engine's performance. These air/oil separators will capture excess oil and keep it out of your intake tract so that your engine will breathe cleaner intake air--better air equals better performance. Moroso offers universal and custom fit versions in small and large body sizes. The large bodies, besides having more capacity, feature a bottom drain with an elbow that makes draining the collected oil virtually mess-free. Their polished billet aluminum bodies can be chromed, painted, or powdercoated. The small units offer a 2-piece body that unscrews for draining and are available raw or with polished or anodized finishes.

4.71 out of 5 stars ( 331 )

$258.99

$233.09

S&S Cycle Oil Filters

S&S Cycle oil filters are constructed out of a sturdy steel canister, which houses the finest filtering media and internal components available. The filter media has traps to catch the smallest particles possible but not restrict flow. The filters are available in a black or chrome finish to accent your ride properly. With S&S Cycle oil filters you'll keep your oil clean and your engine protected.

4.5 out of 5 stars ( 2 )

$183.95

Biker's Choice Oil Tank Dipsticks with Gauge

Biker's Choice oil tank dipsticks with gauge are available in analog with a 350 degree range and in digital styles. The digital dipsticks offer LCD display with blue backlight for viewing when dark, Celsius/Fahrenheit reads, automatic off, and overheat warning functions.

Not Yet Reviewed

$145.81

Kuryakyn Bluegrass Breather Kits

Trap excess crankcase oil blowby with Kuryakyn bluegrass breather kits. By routing banjo tubes in an upward position and feeding into a vented catch can, Kuryakyn bluegrass breathers kits allow gasses to escape while catching any droplets of oil that may have got by. Breather kits available with a long or short leg banjo tube.

Not Yet Reviewed

$110.99

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$111.99

Wiseco Powersports Piston Kits

Wiseco powersports piston kits include your rings, piston pin, and circlips. Wiseco has a decade of experience producing quality pistons for dirt bikes, ATVs, snowmobiles, outboard marine engines, and motorcycles. Their piston kits provide strong, lightweight pistons with optimized designs that improve engine efficiency and maximize your torque and throttle response. Plus, Wiseco powersports piston kits are produced right here in the USA. It's time to blaze your own trail with Wiseco powersports piston kits.

4.13 out of 5 stars ( 8 )

$201.99

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$221.99

S&S Cycle Standard Adjustable Pushrods

S&S Cycle standard adjustable pushrods help to assure consistent valvetrain operation under all conditions. The pushrods are made from rigid chromoly steel tubing and offer a simple, trouble-free installation. You can purchase just the pushrods or as a set with pushrod covers, O-rings, and cover keepers. Replace the stock, non-adjustable pushrods in your stock or high performance application with S&S Cycle standard adjustable pushrods, available for a wide range of Harley-Davidson® bikes from 1984 and up.

5.0 out of 5 stars ( 1 )

$249.95

Feuling Parts Camplate PSI Testers

Feuling Parts camplate PSI testers are a must for any Harley-Davidson® Twin Cam engine builder. Bench-test each camplate before installation, cycle the pressure relief valve—testing the operation and ensuring that the valve moves freely, and seats and seals each time. Any leakage at the relief valve will reduce oil pressure. These camplate support tools let you know what PSI the relief valve opens; the spring tension can be adjusted to achieve the desired pop off PSI. Testers include: * Air regulator * 0-100 psi pressure gauge * Gaskets and needed hardware * Tool fits all Twin Cam engine camplates

Not Yet Reviewed

$202.95

Kuryakyn Bluegrass Breather Catch Tanks

Looking for a replacement breather catch tank for your Kuryakyns bluegrass breather kit? Looking to create your own kit? Kuryakyn bluegrass breather catch tanks are small, compact and vented to mount anywhere. With their chrome plating, they look good too!

Not Yet Reviewed

$113.99