When you bid on a Japanese motorcycle at auction from the UK, you are trusting a single sheet of paper. That sheet — completed by a trained inspector who physically examined the bike — contains everything you need to know. And at the centre of it sits one number: the grade.
The grade is not a rough estimate. It is a standardised score assigned by a certified inspector after checking every panel, peering under the tank, spinning the wheels, and noting every mark, dent, and mechanical fault. Get good at reading grades and you will know exactly what condition a bike is in before you commit a single pound.
This guide walks through every grade number, every letter code, and every section of the auction sheet — so you can bid on Japanese motorcycles with the same confidence as a dealer who has been doing this for twenty years.
The Full Grade Scale: From Brand New to Salvage
Japanese vehicle auctions use a standardised grading system that virtually all auction houses follow. BDS — the dedicated motorcycle exchange — USS, and all other major venues apply the same scale. The numbers run from 6 at the top to 1 at the bottom, with letter codes for vehicles carrying accident or repair history.
| Grade | Condition | What to Expect | For UK Imports? |
|---|---|---|---|
| 6 | New / Unregistered | Under 1,000 km, never registered. Essentially no marks at all. | Rare. Prices rival new bikes. |
| 5 | Excellent | Typically 1,000–10,000 km. Very minor marks only — like new in practice. | Premium price, excellent condition. |
| 4 | Very Good | Light scratches or small scuffs. No dents or rust. Full mechanical health. | Great for resale or showroom quality. |
| 3.5 | Good | Minor cosmetic issues: small scratches, slight wear. Mechanically sound. | Best value for most buyers. |
| 3 | Average | Noticeable scratches, minor dents, or light surface rust. Roadworthy. | Budget for cosmetic work on arrival. |
| 2 | Below Average | Multiple scratches, dents, fading, or minor damage. Needs cosmetic work. | Project bikes only. |
| 1 | Poor | Significant damage, heavy wear, possible mechanical issues. | Parts bikes. Not recommended for UK road use. |
| S | Parts / Salvage | Non-runner or written off. Confirmed parts-only status. | Parts only. |
| R | Repaired | Structural repair carried out (修復歴). Appears alongside grade: 4R, 3.5R, etc. | Caution — see Red Flags section. |
| RA | Repaired Accident | Accident damage that has been repaired. Structural work confirmed. | Avoid unless heavily discounted. |
| A | Accident | Unrepaired accident damage present on the vehicle. | Insurance write-offs only. |
The majority of bikes sourced through AWA come in at Grade 3.5 or 4. This range gives you mechanically sound, well-maintained machines with only minor cosmetic wear — at auction prices significantly below Grade 5 or 6 equivalents. Grade 3 is viable if you enjoy a light restoration project and factor in the cosmetic work cost upfront.
Letter Suffixes and Condition Codes: What A, B, and U Mean
The grade number tells you the overall condition. The letter codes tell you exactly where the issues are and how serious they are. These codes appear both in the grade description and plotted directly on the damage diagram.
The standard codes used across all major Japanese auction systems are:
| Code | Meaning | Severity Scale |
|---|---|---|
| A | Scratch | A1 = hairline, A2 = visible, A3 = deep scratch |
| B | Dent / Ding | B1 = small, B2 = medium, B3 = large dent |
| U | Rust | U1 = surface only, U2 = moderate, U3 = deep or structural |
| W | Wave / Ripple | W1 = slight, W2 = noticeable, W3 = severe |
| C | Crack | C1 = hairline in fairing, C3 = structural concern |
| X | Parts replaced | Component has been swapped (e.g. non-original exhaust) |
| XX | Parts missing | Component is absent entirely |
| E | Corrosion | Deeper than rust — chemical or salt damage |
| S | Stain / Fading | Discolouration, UV fade, oil staining |
| P | Repaint | Panel has been repainted — may hide previous damage |
| Y | Modification | Aftermarket part or custom modification fitted |
When these codes appear alongside the grade — for example, 3.5 A2 B1 — it means a Grade 3.5 bike with a visible scratch and a small dent. The damage diagram (see below) shows you exactly where they are on the bike.
A Grade 3.5 with two A2 codes in low-visibility locations is often a better practical buy than a Grade 3.5 with one B2 in the centre of the tank. The condition codes give you the specificity to compare bikes properly — use them every time.
The Damage Diagram: How to Read Location Codes
Every auction sheet includes a schematic of the motorcycle — typically views from above and from both sides. The inspector marks each damage point directly on this diagram and annotates it with the relevant condition code.
The clock-face location system
The diagram uses a clock-face reference for locating damage:
- 12 o'clock — front of the bike (headlight end)
- 6 o'clock — rear (tail end)
- 9 o'clock — left side (rider's left when seated)
- 3 o'clock — right side
An annotation reading A2 — 3 means a visible scratch on the right side. The same code at 9 means the same damage is on the left side.
Most frequently marked locations on motorcycles
Knowing where marks commonly appear helps you interpret the sheet at a glance:
- Tank — key scratches, belt buckle dents, sticker residue
- Fairing lowers — stone chips, road rash, scuffs from footwear
- Exhaust cans — surface corrosion, heat discolouration, cosmetic marks
- Frame rails — any marks here indicate a laid-down; inspect very carefully
- Swingarm — chain wear marks, road rash from drops
- Wheel rims — kerb rash, impact dents from potholes
- Levers and switchgear — broken tips, scuffs from low-speed drops
Any damage code plotted on the frame section of the diagram warrants serious scrutiny, regardless of the overall grade. Frame damage can affect structural integrity and may create complications during UK DVLA registration or MSVA inspection. Always request additional photos and, where possible, arrange a pre-purchase inspection before committing to a bid.
Beyond the Grade: Mileage, Service Records, and Equipment
Experienced importers always cross-check three additional sections of the auction sheet before finalising a bid.
Mileage (走行距離)
The odometer reading is recorded by the inspector and marked as either verified (確認) or unverified. BDS electronically logs mileage from the instrument cluster where modern bikes allow it. USS and other general auction houses do the same for cars.
Extremely low mileage for the model year is a positive sign, but dramatic discrepancies deserve scrutiny. If a 2003 bike shows 3,200 km, cross-reference the physical wear indicators on the sheet — tyre tread depth, chain condition, and brake pad thickness are difficult to fake and tell a more reliable story than the odometer alone.
Service records (整備手帳)
The sheet notes whether a service book is present (有 = present) or absent (無 = absent). Japanese bikes sold with their original service books and registration documents command a price premium, but the documentation is particularly valuable for UK MSVA or IVA inspections on bikes outside Type Approval. For investment-grade or limited-edition motorcycles, absent service history is a genuine concern.
Equipment and modifications
The sheet lists non-standard equipment: aftermarket exhausts, custom handlebars, and accessories. Any modification from standard specification is flagged. This matters because heavily modified bikes can face additional scrutiny at DVLA registration. A stock bike with a clear specification is almost always simpler and cheaper to register in the UK than a modified one.
The sheet records how many keys are included. One key means the second was lost at some point; zero keys may indicate the bike was acquired without documentation. Getting a replacement key or reprogramming a Japanese ECU transponder in the UK is possible but adds cost and lead time — factor this into your maximum bid calculation.
Grade 3.5 vs Grade 4 — Where the Real Value Hides
The auction price gap between Grade 3.5 and Grade 4 on the same model is often 15–40%. Yet in practical terms, the difference between them is almost entirely cosmetic.
Grade 4 bikes are very clean. They photograph beautifully, present strongly at resale, and require nothing beyond a standard service on arrival. For buyers who intend to sell quickly or show at events, Grade 4 is the right call.
Grade 3.5 bikes have minor cosmetic issues — perhaps a jacket-zip scratch on the tank, or light fading on a lower fairing panel. These marks do not affect reliability, performance, or roadworthiness. A mechanically well-maintained Grade 3.5 is often a better long-term proposition than a Grade 4 that has sat unused for three years.
| Grade 3.5 | Grade 4 | |
|---|---|---|
| Auction price | Lower (typically 15–40% less) | Higher |
| Cosmetic condition | Minor marks present | Very clean |
| Mechanical condition | Same as Grade 4 | Same as Grade 3.5 |
| Arrival prep needed | Possible minor touch-up or detail | Service only |
| Best for | Value buyers, daily riders | Resellers, show bikes |
For most buyers using AWA to source a reliable Japanese motorcycle, Grade 3.5 in the right mileage and model bracket delivers the best return on investment. The lower hammer price typically covers a professional detailing session — with money to spare.
Red Flags That Override a Good Grade
A strong grade number does not guarantee a perfect purchase. Several specific conditions should cause any experienced buyer to pause, regardless of what the headline grade says.
1. The R or RA suffix
An R suffix means documented structural repair history (修復歴あり). Grade 4R means the bike is cosmetically excellent but has had frame or chassis work done. For daily riders who prioritise function over history, this may be acceptable at the right price. For investment bikes, limited editions, or bikes you intend to resell, avoid R and RA grades.
2. Damage codes on structural components
Frame rails, the steering head, swingarm pivot, and fork stanchions carry the bike through every corner and braking event. Any condition code plotted on these components warrants extreme caution and, where possible, a pre-purchase inspection before you place a bid.
3. U3 rust codes
Surface rust (U1) on exhaust fasteners or chrome trim is cosmetic and easily treated with a wire brush and rust inhibitor. U3 codes — especially on frame rails, the swingarm, or wheel rims — indicate structural corrosion. Full remediation is expensive and the long-term reliability of a structurally corroded frame is compromised.
4. Grade mismatched with mileage
A Grade 2 bike with 8,000 km has been mistreated. The grade and mileage should broadly correspond — a significant mismatch suggests poor maintenance, unreported drops, or odometer manipulation. Treat the combination as a warning signal.
5. Missing service records on premium models
For high-value machines — Honda RC30, RC45, Kawasaki H2, Yamaha R1M, any limited edition — absent service history substantially affects resale value and makes provenance hard to establish. The missing book does not prove poor maintenance, but it removes an important layer of confidence.
AWA can arrange independent pre-purchase inspections at BDS and USS before your lot goes through the hall. This service is especially worthwhile for Grade 3 bikes, any bike carrying an R or A designation, and high-value machines where condition verification is critical. Contact AWA to discuss your requirements before bidding.
Understanding auction grades is one of the most valuable skills any importer can develop. Pair this knowledge with a full picture of the total cost breakdown for Japan-to-UK imports and the complete inspection sheet reading guide, and you will have everything you need to bid confidently on any bike in the Japanese market.
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