Boards · MotoSurf · UIM
Board racing
Motorised surfboard racing, kept deliberately apart from ski racing, which the archive (baddjetarchive.com) covers. A different rulebook, different classes and different riders. Everything here is read from a primary document and says which one.
- Machine
- A surfboard with a motor, ridden standing or squatting, never lying or kneeling (Art. 311.01).
- Engine
- 100 cc two stroke, across the JetSurf family, by its maker's manual.
- Top speed
- 55 to 64 km/h (35 to 40 mph) as the manual states it, without saying how it was measured. Each model's figure: the JetSurf models compared.
- Race
- Laps of a buoy course with a long lap (Art. 302): heats of 5 to 8 laps and a final (Art. 307). The weekend in order: the MotoSurf race format.
New to board racing? Start here: the pages below in the order a first-time racer needs them.
Newer and thinner than the archive: built from 9 documents alone, with no board raced, measured or fitted. The full note is at the foot of the page.
JetSurf, MotoSurf, motorised surfboard: three names that are not the same thing
- JetSurf
- A brand of motorised surfboard, made by MSR Engines s.r.o. of the Czech Republic. It is the only board brand named in the 2025 or the 2026 MotoSurf rulebook; the only other maker either names is FCS, for fins (both text copies searched 2026-11-01).
- MotoSurf
- The racing discipline, recognised by the Union Internationale Motonautique since 2019, and the name of its rulebook.
- Motorised surfboard
- The machine itself, whoever built it. The maker's manual uses this phrase too, and treats "motosurf" and "motorized board" as one.
The rulebook uses JetSurf for a brand and its models and MotoSurf for the sport; JetSurf's own manual also calls the machine a motosurf.
How we know: 2026 MotoSurf Rulebook, Art. 100, and the JetSurf owner manual, as the list above reads them.
Two findings: open and closed classes, and fins
Neither one make nor open: the rulebook declares 3 MotoSurf classes open and 5 closed, and JetSurf, the one board brand it names, appears only in the closed ones.
Fins are among the few things a sealed engine rider may change, yet the rulebook's whole fin geometry is two numbers on a silhouette and one shape rule. The MotoSurf fin rules page has the detail.
| Page | What it answers | What it rests on | How big |
|---|---|---|---|
| Classes | Which class a rider fits, and what it lets them change. | The 2026 rulebook, article by article. | 8 classes, 3 with a manufacturer sealed engine |
| Fins | What the rules actually say about fins, and what they do not. | The rulebook, plus the manufacturer equipment lists. | Mandated in 6 of 8 classes |
| Boards | Which machines exist and which fin each one ships with. | The manufacturer owner manual. | 6 models |
| Homologation | Engine, exhaust, pump and impeller figures with tolerances. | 2 UIM homologation forms, read from page images. | 2 forms |
| Kit | What is compulsory, what it consumes, what wears out. | The rulebook for the compulsory half, the manual for the rest. | 16 items, 10 from ordinary suppliers |
| Race weekend | How long the racing is, and what the rulebook prices. | Both editions, which disagree about publishing a fee at all. | 10 lap chart rows, 4 entry fees with a printed figure |
| Champions | Who won each class, every season the series has records for. | The promoter's standings and season reports, checked against the covers. | 46 world titles across 11 seasons |
| Riders | Who currently holds each title. | The rulebook covers, the only place the rulebooks name a rider. | 13 champions across 2 rulebook covers |
| Sources | Every document behind this site, and what each one lacks. | Itself. | 9 documents, 27 declared gaps |
What this site does not do
- It does not mix with ski racing. A MotoSurf article number filed next to an IJSBA one invites a reader to cite the wrong sport at a tech inspection, so the two are kept on separate pages with separate archives.
- It does not carry race by race results or a record list. The season titles are on the MotoSurf world champions page, from the promoter's standings. Article 600 of the 2026 rulebook is reserved for records and performances regulations, and says only that MotoSurf ones may be introduced in the future.
Nothing here is for sale. If a rule or an item on these pages leaves you with a question, ask us and we will tell you what the documents say about it, or that they say nothing.
Every page of board racing, A to Z.
8 classes · 9 documents · 27 gaps declared