When a shop asks you to identify motorcycle part by frame number, it is not being awkward. The badge, the colour and the year you bought the machine are not what the manufacturer’s catalogue is organised around, and the frame number is.
Why a supplier asks for your frame number
Manufacturers build variants that look identical and take different components. Market, production period, optional anti-lock brakes and mid-year revisions all split a single model into several. Your registration document knows the year; the frame casting knows which of those variants you actually own.
There is a second reason, less often admitted. Badges get swapped, tanks get repainted and second-hand machines arrive described optimistically. The stamping in the metal is the only description that has not been edited.
Where the frame number is stamped
The standard location is the steering head, sometimes called the headstock: the vertical tube at the front of the frame that the forks pass through. On most machines it is stamped into the metal on the right-hand face, and there is often an identification plate riveted nearby carrying the same characters.
We describe that in general terms deliberately. Locations vary by manufacturer and by era, and we are not going to publish a model-by-model map we cannot verify. If you cannot find it, photograph the headstock from both sides and send the pictures with your enquiry.
Transcribe it exactly, character for character, including any leading letters and any hyphen. One wrong character opens a different catalogue, and the parts you are then shown will be the wrong ones without anything looking obviously amiss.
A photograph beats typing. Stampings weather badly, and the pairs that get confused most are eight and B, zero and D, and one and I. If you send the picture as well as the characters, we can check one against the other.
How to identify motorcycle part by frame number
Honda’s own catalogue instructions set the rule out plainly, and it is worth quoting because it settles an argument people have constantly. Honda tells you to gather the frame number, the engine number and the colour label before you start, then states which number governs which group: “Frame parts (Group number is ‘F’)=Please identify a part from Frame number” and “Engine parts (Group number is ‘E’)=Please identify a part from Engine number”.
So the frame number is the right key for chassis, bodywork, brakes, electrical and cycle parts. It is the wrong key for internal engine components, and on any machine whose engine has been replaced the two numbers describe two different histories.
| Identifier | Found on | What it settles | What it will not tell you | Use it when |
|---|---|---|---|---|
| Frame number | The steering head, and the identification plate | The machine, its variant and its market | Which part you want, or what engine is now fitted | You know the part by name but not by number |
| Engine number | The crankcase | The engine, and the engine parts group | Anything about the chassis or bodywork | You are ordering internal engine components |
| Genuine number | The catalogue, or the old component | One specific item | Whether it belongs to your machine | You already have it and want it quoted |
| Brand product number | The tuning brand’s catalogue | One item in that brand’s range | Nothing at all about your machine | You are ordering a branded special part |
| Model or type code | The identification plate | Which catalogue applies | The exact production point inside that variant | You are narrowing down before searching |
| Year, make and model | The registration document | A family of machines | Market, fuelling, brake options, mid-year changes | Never on its own |
Read alongside the guide to searching by part number, those six cover almost every enquiry we receive.
When the number is not a seventeen-character VIN
Most English-language advice quietly assumes a seventeen-character vehicle identification number and a decoder to read it. That assumption breaks the moment the machine is Japanese-market or Thai-market.
Machines in the classes we deal with commonly carry a shorter frame number built from a model code and a serial, with no manufacturer identifier block at the front. Feed one of those into a Western decoder and you get nothing back, which readers understandably take to mean the number is wrong. It is not wrong; it is a different scheme.
Owners of a Honda Monkey, a Honda Sonic 125 or a Kawasaki KSR110 hit this constantly outside Asia. Send the characters exactly as stamped, however short they look, and we will work out which catalogue they belong to.
Reading the frame-number notes on a parts diagram
Once the right catalogue is open, entries carry conditional notes that decide whether a listing applies to you. They are short, easy to skim past, and responsible for a large share of wrong orders.
| Note on the entry | What it means | What to do |
|---|---|---|
| From frame no. | The item applies from a production point onwards | Compare your serial against it before ordering |
| Up to engine no. | The item applies to earlier engines only | Check the engine number, not the frame number |
| For anti-lock brakes | The listing is for one brake specification | Confirm which specification your machine has |
| Quantity required | The assembly takes more than one of the item | Order the stated quantity, not a single piece |
If your serial falls close to a stated boundary, ask rather than assume. That is a judgement call, and it is one we would rather make together with you than have you discover after the parcel arrives.
Frequently asked questions
Is the frame number the same thing as a VIN?
Often, but not always. Machines built for Western markets since the early nineteen-eighties generally carry a standardised seventeen-character number, and on those the frame number and the vehicle identification number are the same characters. Japanese-market and Thai-market machines frequently use a shorter scheme of their own, and it is equally valid.
Will my frame number tell you which part I need?
No, and this is the most common misunderstanding. It identifies your machine so we open the right catalogue and quote the right variant, but it says nothing about which item you are after. Pair it with a part name, or with a photograph of the area, and the two together are enough to work from.
Is it safe to email a frame number?
We ask for it because there is no other reliable way to identify the machine, and we use it for that and nothing else. If you would rather not send the full number in a first message, send the model code and a photograph of the part and we will tell you whether we can get far enough without it.
Sending your frame number with an enquiry
Send the frame number exactly as stamped, the name of the part you want, your destination country and the quantity. A photograph of the part, or of the place it fits, resolves an unclear description faster than any amount of writing. If the item is an internal engine component, send the engine number as well.
The order policy covers payment, shipping and returns before you commit, and the parts section shows the categories we cover. Open a quote request when you are ready, or use the contact page if you would rather explain the job in your own words.