Do aftermarket parts void my motorcycle warranty?

Not automatically. Under the Magnuson-Moss Warranty Act, the FTC says a company can't void your warranty solely because you used another company's part, but it can deny coverage for damage that the part actually caused.

Are aftermarket motorcycle parts lower quality than OEM?

Not always. Some aftermarket brands match or beat OEM quality, while others are cheap copies. Quality depends on the maker, so compare brands and read the fit and spec details.

What does OEM mean on motorcycle parts?

OEM means original equipment manufacturer, the part made to the maker's spec for the bike. It can be sold in a dealer box or by the same supplier under another label.

Are used parts a third option?

Yes. Used OEM parts can be a cheaper way to get factory fit. They aren't safe for every part, so stick to low-risk items like body panels and levers.

OEM vs aftermarket motorcycle parts: which should you buy?

For safety-critical and electronic parts, OEM is usually the safer buy. For wear items, controls, accessories and anything where you want a different feel, a reputable aftermarket brand is often as good or better and costs less. The real question isn't OEM or aftermarket in general, it's which part, which brand and what the job is. This guide shows how to decide.

What is the difference between OEM and aftermarket parts?

OEM (original equipment manufacturer): Parts built to the bike maker's specification, sold through dealers or the same supplier.
Aftermarket: Parts made by other companies. Quality ranges from excellent to poor.
Used OEM: Original parts taken from another bike, usually cheaper than new OEM.
Genuine vs OEM: "Genuine" usually means the maker's branded part. Some OEM-made parts come in other boxes.

OEM vs aftermarket at a glance

Factor	OEM	Aftermarket
Price	Usually higher	Often lower, but some performance parts cost more
Fit	Designed for your exact bike	Varies by brand and model
Quality	Consistent	Ranges from poor to better than stock
Choice	One option per part	Many options and price tiers
Availability	Can be slow or discontinued for older bikes	Often easier to find for older and popular models
Warranty	Backed by the maker or dealer	Backed by the part maker, if at all
Resale	Stock parts can help value	Quality upgrades can appeal to some buyers

When OEM is the better choice

Pick OEM, or a proven direct equivalent, for:

Electronics and sensors: ECUs, fuel injection sensors, ignition modules and wiring harness parts. Cheap versions often fail early or throw codes. See motorcycle check engine light.
Safety-critical systems: Brake master cylinders, calipers, ABS parts, steering stem bearings and frame-related hardware.
Parts that affect emissions: Catalytic converters, oxygen sensors and evaporative parts. The EPA says parts whose principal effect is to bypass, defeat or render inoperative emissions controls are illegal for use on road vehicles.
Warranty repairs: Use dealer parts if the bike is under warranty and you want a simple claim.
Tight-tolerance engine parts: Valves, cam chain tensioners and timing components, unless a reputable brand specifically supplies the same part.
Very specific fit: Fairings and panels where colors and mounting points matter.

When aftermarket is a smart choice

Wear items: Chains and sprockets, brake pads, filters, spark plugs and batteries. Many aftermarket brands match or beat stock. See our guides to brake pad types, spark plugs and battery types.
Tires: Many riders choose a tire brand and type for their riding style, not the OE tire. Our tire choice guide walks through it.
Controls and ergonomics: Levers, grips, pegs, seats and bar risers.
Suspension upgrades: Better springs, fork cartridges and rear shocks for your weight and use.
Lighting and accessories: Windscreens, bags, crash protection and lighting, if they meet legal and fit requirements.
Older and discontinued models: When the dealer can't get the part, quality aftermarket is often the only option.
Fluids and consumables: Choose oil by the rating your manual lists. Our oil guide covers JASO and viscosity.

Do aftermarket parts void your warranty?

Not automatically. The FTC states that under the Magnuson-Moss Warranty Act, a company can't void your warranty or deny coverage solely because you used a part made by another company or had repairs done by someone outside the company. A manufacturer can deny a claim for a defect that was caused by the aftermarket part. FTC action against a motorcycle maker for telling customers otherwise is a reminder that this isn't just theory.

In practice:

Keep receipts and records for parts and service.
Use parts that meet the manual's specifications.
Expect a dealer to push back. Be ready to show that the part didn't cause the failure.
If a claim is denied, ask for the reason in writing.

Our guide to dealer service vs independent motorcycle shops covers how this plays out in real life.

Emissions and legal limits

Some aftermarket parts, such as exhausts with the catalyst removed or tuning devices that defeat emissions controls, may not be legal for street use. The EPA's fact sheet states that tampering with emissions controls is prohibited under the Clean Air Act and lists civil penalties. Check that a part is labeled legal for road use for your state and model year before you buy. Some states, including California, have additional rules.

How to judge aftermarket quality

Check the brand's reputation with owners of your bike, not just reviews on a seller's page.
Look for specs you can compare: materials, sizes, ratings and standards. If there are none, be careful.
Confirm the fit for your year, model and trim.
Look for return policies and warranty.
Be wary of extreme discounts on safety-critical parts. Fake and counterfeit parts exist.
Compare with OEM by weight, finish and markings.

What parts cost: rough ranges

Costs vary by bike, region and shop, and the gap between OEM and aftermarket isn't the same for every part.

Part	OEM tendency	Aftermarket tendency
Brake pads	Moderate	Often cheaper for similar quality
Chain and sprocket kit	Higher	Lower to similar
Air filter	Moderate	Lower, or reusable at higher cost
Sensors and electronics	Higher	Lower, with more risk
Exhaust	Higher, quiet	Wide range, often louder
Fairings	High	Much lower, fit varies

A professional shop may mark up parts, whichever kind you choose. See how motorcycle shop labor rates work and typical repair prices by job. If the bike is old, run the numbers in is it worth repairing an old motorcycle.

What about used OEM parts?

A used factory part can give you OEM fit at a lower price, which is attractive for body panels, wheels, levers and other low-risk items. Be more careful with brake, steering and electrical parts, where hidden wear matters. If you're unsure whether a used part is safe, ask a mechanic near you to check it before fitting.

Can I bring my own parts to a shop?

Some shops allow it, many don't or won't warranty the work. A shop's warranty usually covers its labor, and the part maker covers the part. Ask before you buy, and let the shop recommend a brand it trusts. If a shop doesn't want to install a part, ask why.

When to see a mechanic

Ask a professional before you choose parts when:

The part affects braking, steering, suspension geometry or the frame
The bike is under warranty and you aren't sure about coverage
The fit is uncertain and the part is expensive
Aftermarket electronics trigger warning lights
You're modifying the bike for performance

A shop that does performance tuning can advise on upgrades, and you can find motorcycle repair shops in Miami or in your own state through our shop directory.