On a quad or UTV, the frame number is stamped into the steel chassis, usually low down on a frame rail near a wheel, and many machines also carry a printed VIN label, often under the seat. On motorbike-style e-bikes, start at the steering head. Your owner's manual shows the exact spot for your model.
Which number is which
People use these terms loosely, so here's what each one means.
| Number | What it is | Where it lives |
|---|---|---|
| Frame number | The chassis serial number | Stamped into the frame |
| VIN | Vehicle identification number: a standard 17-character format | Stamped into the frame, often repeated on a label |
| Engine number | The engine's own serial number | Stamped into the engine casing |
On most modern quads and UTVs, the frame number is the VIN: 17 letters and numbers. Older machines and some imports use a shorter frame number. Either way, it's the number that matters most. It's the one that should appear on your invoice or V5C, and on any finance agreement or insurance schedule.
The engine number is secondary but still useful. Engines get swapped, so a mismatch isn't automatically a problem, but it's a question a buyer will ask. If your paperwork records the engine number, photograph that too.
A printed VIN label is handy but easy to peel off or replace. The stamped number in the metal is the one that counts.
Quad frame numbers, make by make
Every manufacturer puts the number somewhere slightly different, and it can move between models and years. The owner's manual for your exact model has a diagram showing where it is. Lost the manual? Most makers publish them online, and your dealer can tell you from the model and year.
Searching without one? Work round the machine in this order with a torch and a rag:
- the frame rails behind and below the front wheels, on both sides
- under the front bumper and around the front differential
- under the seat (lift it off: labels often live here)
- the frame tubes around the footwells
- the rear frame near the rear wheels, and under the rear rack
Take the mud off before you give up. On a working farm quad, the number is very often there, just under years of dirt.
Honda Rancher and Foreman
They're the Hondas we see most, along with older TRX models. Honda's owner's manual for your model marks both the frame and engine number positions. We also buy Honda quads of every age.
Yamaha's Grizzly and Kodiak
Most of the Yamahas we see are these two farm quads, with the odd older sports quad. The position isn't identical across every Yamaha, so go by the manual for your model and year. Selling one? Start with our Yamaha buying page.
Kawasaki: Brute Force and KVF
Brute Force and older KVF models. No manual? Work round the frame using the checklist above. Here's how we value a Kawasaki quad.
Suzuki: KingQuad farm quads
Plenty of KingQuads have done years of farm work, so expect to scrape the frame before the number shows. More on how we buy Suzuki KingQuads.
Polaris: Sportsman
Sportsman models are the Polaris quads we see most. Look low on the front frame before anywhere else. See our Polaris quad offers.
Can-Am: Outlander, checked against BRP
This is the one make we've verified against the manufacturer's own operator's guide. On the 2024 Outlander and Outlander MAX (G2) series, the BRP operator's guide shows a VIN label on the frame under the seat, and the stamped VIN on the right side, below the front differential. Other years and series may differ. More on selling your Can-Am.
CFMOTO: CForce
CForce models turn up on farms and smallholdings. CFMOTO's owner's manual for your model shows where the VIN and engine number sit. We buy CFMOTO CForce quads too.
UTVs and Gators: where the number hides
UTVs are bigger, so there's more frame to search, but the principle is the same: a stamped number on the chassis, and often a label too. Start low on the front frame, then check under the seats and around the cargo bed mounts.
Gator: a PIN, not a VIN
John Deere calls it the product identification number, or PIN. It's recorded in the operator's manual and on the dealer invoice. If you've got the invoice, the PIN on it is what we'll match to the machine. Read how we buy a John Deere Gator.
Mule: clean the lower frame first
Go by the operator's manual for your model. Mules often spend their lives on farms and estates, so scraping the mud off the lower frame is usually step one.
Ranger: match it to the V5C
A road-registered Ranger has its VIN printed on the V5C too, so you know exactly which characters you're hunting for. Check the two agree before you sell.
Electric dirt bike frame numbers
Motorbike-style frames usually carry the number on or near the steering head: the tube at the front of the frame that the forks turn in. That's the first place to look on an electric dirt bike, but check the manual for your model.
Sur-Ron Light Bee and Ultra Bee
Look around the steering head first, and on the Storm Bee too. The frame number on the bike should match your invoice or receipt. Swapped the frame for an aftermarket one? Tell us, as that changes what we check. More on selling a Sur-Ron.
Talaria Sting and XXX
As with the Sur-Ron, start at the steering head and compare the number with your purchase paperwork.
Stark Varg: start with the invoice
A newer, higher-value bike, so the frame number should be printed on your invoice. The manual shows exactly where it's stamped.
Most Sur-Ron, Talaria, Stark Varg and E Ride Pro models are not road legal. They're for private land with the landowner's permission, and tracks. We never suggest riding a non-road-legal bike on public roads.
Number worn or rusted? How to read it
Frame numbers on working machines get worn and rusty, and caked in mud. Most can still be read with a bit of care.
- Clean it gently. Warm soapy water and a soft brush first, then a plastic scraper for caked mud. Never a grinder or wire wheel.
- Shine a torch across the metal from the side, not straight on. Low-angle light throws shadows that make shallow stamping readable.
- Try a rubbing: paper over the number and a soft pencil rubbed across it can pick up worn characters.
- Take two photos. One close-up should fill the frame with the number, and one wider shot should show where it is on the machine.
- Read it character by character. Zero and O are easy to confuse. So are 1 and I. Watch 5 against S and 8 against B too.
Never re-stamp a frame number or paint over it, even to make it clearer. Filing is just as bad. A number that looks tampered with is a serious red flag to any buyer, and can make a machine unsellable. Damaged or missing altogether? Tell us before we come out and we'll talk it through.
Every ownership check we make starts from this number. Our guide to the rest of our ownership checks shows how it fits in. Or just send us the photos with your offer request.