Tech Tip: What Your Bike’s VIN Can Tell You


Categories: How To, Ask RideApart, Expert Advice

Every time you buy a vehicle, there is one key, indispensable bit of information that you must convey to the state to register and license it, to your insurance company to positively identify it, to your lender (if you use one) to secure the loan with it: the VIN or vehicle identification number.

Knowing what a VIN can tell you about your motorcycle—or your next potential motorcycle—can save you a lot of trouble and expense.  Every time a motorcycle is stolen, the VIN becomes a part of the police report and activities to track, locate, and recover it.  When a bike is damaged in a storm, flood, fire or crash, the insurance company will have a record of the VIN it paid out a claim on.

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Even something as simple as getting the right part for the bike can hinge on using the VIN, particularly if mid-year model changes occurred. Since the VIN is displayed on both the engine and frame, if they don’t match on a given bike, it’s a certainty that whichever number doesn’t match what is on the title, it's not the original. This is good to know if the seller represents the bike as all original. Matching engine and frame numbers are of particular importance to vintage bike collectors, even if the bike is too old to have been built when modern VIN standards were in effect.

There was a time when motorcycles had a simple serial number—if they had any identifiable markings at all. Times have changed.

In 1954 automobile manufacturers in the U.S. began using vehicle identification numbers, but there wasn’t a standardized format for content or organization; each manufacturer did their own thing.

In model year 1981, the National Highway Traffic Safety Administration required that all over-the-road-vehicles sold must contain a 17-character VIN. This standard established a fixed VIN format.

In the U.S., Title 49, Part 565 of the Code of Federal Regulations deals with VIN requirements. Under 49 CFR 565.12(r), VIN is a series of Arabic numbers and Roman letters that is assigned to a motor vehicle for identification purposes. Current VIN systems are based on the standards issued by the International Standards Organization (ISO), though the U.S. system is more stringent and the European Union standard is somewhat less so.

VIN explanation from H-D
The Harley-Davidson Sportster owner’s manual provides an excellent explanation of how the VIN translates into information specific to a given bike.

Decoding the VIN code

The first three characters identify the manufacturer of the vehicle using the World Manufacturer Identifier (WMI) if the manufacturer produces more than 500 vehicles of a given type each year.  In the U.S., Society of Automotive Engineers (SAE) assigns WMIs to countries and manufacturers.

If the manufacturer produces less than 500 motor vehicles of its type annually, these characters along with the third, fourth and fifth characters of the fourth section must uniquely identify the manufacturer, make, and type of the motor vehicle. These characters are assigned in accordance with Sec. 565.7(a) of the U.S. Code of Federal Regulations.

The second section consists of five characters, in positions four through eight. This section also identifies the attributes of the vehicle. For passenger cars, and for multipurpose passenger vehicles and trucks with a gross vehicle weight of 4536 kg. (10,000 lbs.) or less, the first and second characters are alphabetic and the third and fourth characters are numeric. The fifth character may be either alphabetic or numeric. The characters utilized and their placement within the section may be determined by the manufacturer, but the information must be able to be interpreted using information from the manufacturer.

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The use of the gross vehicle weight designation within the VIN itself is not required.

Type of Vehicle and Information that can be represented in the VIN:

  • Passenger car:  Line, series, body type, engine type and restraint system type.
  • Multipurpose passenger vehicle:  Line, series, body type, engine type, gross vehicle weight rating.
  • Trailer, including trailer kits and incomplete trailer:  Type of trailer, body type, length and axle configuration.
  • Motorcycle:  Type of motorcycle, line, engine type, and net brake horsepower.
  • Incomplete Vehicle other than a trailer: Model or line, series, cab type, engine type and brake system.

When encoded in the VIN, engine net brake horsepower must not differ by no more than 10 percent from the actual net brake horsepower. In the case of motorcycle with an actual net brake horsepower of two or less, be not more than two, and shall be greater than two in the case of a motorcycle with an actual brake horsepower greater than two.  I’m not sure why this is specified in such detail for the VIN, but there you have it.

The third section consists of one character, which occupies position nine in the VIN. This is the check digit used to verify the accuracy of any VIN transcription. After all other characters in VIN have been determined by the manufacturer, the check digit shall be calculated by carrying out a mathematical computation specified in the Code.


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