Do Motorcycles Need a Smog Check in California?

Motorcycles do not need a smog check in California. The Bureau of Automotive Repair lists motorcycles among the vehicles excluded from its biennial smog inspection program, and the DMV confirms that motorcycles skip the requirement at both initial registration and renewal, regardless of model year, engine size, or fuel type.¹ You also won’t owe the smog abatement fee that newer cars and trucks pay in lieu of an inspection.²

That said, “no smog check” is not the same as “no emissions rules.” California still controls what you can modify on the exhaust and which out-of-state motorcycles can be registered here. Both catch riders off guard.

Exhaust Modifications Are Still Regulated

Because motorcycles never pass through a smog station, some riders assume no one is checking their exhaust. That assumption can be expensive.

California Vehicle Code Section 27156 prohibits anyone from disconnecting, modifying, or altering a required pollution control device on any motor vehicle, motorcycles included. It also bars the sale or installation of any part that changes the original design or performance of the emissions system. If a court finds the violation willful, the statute requires the maximum fine with no suspension allowed.³

The exception is a part that carries a valid CARB Executive Order (EO) number. Those parts have been tested and approved as not increasing emissions beyond legal limits, and they can be sold and installed legally.³ A pipe or component without an EO number is a violation whether or not you ever face a smog test. Law enforcement can cite you during a traffic stop or at a motorcycle event if they spot a gutted catalytic converter or an obviously non-compliant exhaust.

Before buying any aftermarket exhaust, header, or emissions-related part for a street-registered motorcycle, confirm the EO number. If the seller can’t produce one, the part isn’t street legal in California.

Out-of-State Motorcycles: Where the Rules Bite

This is where the no-smog-check rule gets complicated. You still won’t visit a smog station, but the DMV runs its own verification process that trips up buyers who thought they were in the clear.

Vehicle Verification

Any motorcycle coming from out of state needs a completed Verification of Vehicle form (REG 31), confirming the VIN and other identifying details. A DMV employee, a California Highway Patrol officer, or an authorized private verifier can complete it. DMV and CHP verifications are free; private mobile verifiers charge a fee that varies by location.⁴

The Emissions Label (1978 and Newer)

For any motorcycle that is model year 1978 or newer with an engine of 50cc or larger, the DMV requires a manufacturer’s emissions label physically affixed to the bike, certifying it for on-highway use. If the label is missing or the bike was never certified for California, registration can be refused.⁴

The label itself is usually the Vehicle Emission Control Information (VECI) sticker on or near the engine. A motorcycle marked “50-state certified” or specifically meeting California emission standards will pass. One labeled “federally certified” or “49-state certified” will not, because those designations explicitly exclude California compliance.⁵ Motorcycles from 1977 or older don’t need the label at all, though they still need the vehicle verification.

The 7,500-Mile Rule

Here is the detail that catches people out. California defines a “new motor vehicle” as one with fewer than 7,500 miles on the odometer when a California resident first acquires it. If a motorcycle meets that definition and isn’t California-certified, the DMV will refuse registration outright.⁶ No workaround, no inspection you can pay for, no waiver. The bike cannot be registered.

A non-California-certified motorcycle with more than 7,500 miles isn’t subject to that automatic refusal, but it still needs the vehicle verification and may face additional DMV scrutiny over its emissions label.⁷

If you’re shopping out of state and plan to register the bike here, read the VECI label before you pay. Look for “California” or “50-state” in the certification language. If you see “federal” or “49-state” and the odometer reads under 7,500 miles, walk away unless the seller can prove otherwise.

Which Motorcycles Need What

Any California-registered motorcycle at renewal: no smog check, no smog fee.
New motorcycle bought from a California dealer: already CARB-certified; no smog check at registration.⁸
Out-of-state motorcycle, California-certified, any mileage: vehicle verification required, no smog check.
Out-of-state motorcycle, not California-certified, over 7,500 miles: vehicle verification required, additional DMV review likely, no smog check.
Out-of-state motorcycle, not California-certified, under 7,500 miles: registration refused.⁶
1977 or older motorcycle from out of state: no emissions label required; vehicle verification still needed.

1
Bureau of Automotive Repair. Smog Check: When You Need One and What’s Required
2
California Department of Motor Vehicles. Smog Inspections
3
California Legislative Information. California Code VEH Division 12 Chapter 5 Article 2 – Section 27156
4
California State Department of Motor Vehicles. Vehicle Industry Registration Procedures Manual – Nonresident Vehicles – Section: 12.005 Basic Registration Requirements
5
California State Department of Motor Vehicles. Vehicle Industry Registration Procedures Manual – Section: 12.100 Motorcycles 1978 and Newer Year Models
6
Cornell Law Institute. California Code of Regulations Title 13, Section 151.00 – Refusal of Registration
7
California State Department of Motor Vehicles. Vehicle Industry Registration Procedures Manual – Out-of-State California Resident – Section: 12.135
8
California State Department of Motor Vehicles. Motorcycle Registration