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Article 301.03 · 2026 edition
Stock Men
A closed class: the rulebook names the boards it admits, and every one of them is a JetSurf. Anything the rulebook does not list is prohibited, and the list of what a rider may change runs to 7 items. The engine is sealed by the manufacturer on top of that.
Who may enter Stock Men: age, gender and licence
- Age
- 15 years and over, counted "within the relevant calendar year" as Art. 301.03 puts it.
- Gender
- The rulebook's own phrase is "male biological gender".
- Same weekend
- Art. 301 allows one class per racing weekend, plus Electric Challenge, which is the one exception.
- Licence
- An International licence from the rider's National Authority is compulsory across the championship. Applying for one, through a club, is covered on the how to start MotoSurf racing page.
* Stock Men: does not take the previous season's Stock Men champion, who moves up to Elite Men unless the MotoSurf Committee decides otherwise (Art. 301.03), nor, unless the Motosurf Committee grants an exception, an Elite Men rider under 40 who finished in last season's top 8 or has raced two or more Elite Men rounds this season (Art. 301.01).
* Elite Men: takes a rider only after a completed Stock Men race in the season before, unless the Motosurf Committee grants an exception, and keeps for the rest of the season a rider who has raced two or more of its rounds (Art. 301.01).
Where bars in one group overlap, a rider of that age fits more than one band. Every band counts the age reached during the calendar year, and under Art. 301.09 the Motosurf Committee may still move a rider to another class.
How we know: Each bar is a class record's age band and rider, from the 2026 MotoSurf Rulebook, Art. 301.01 to 301.08.
A rider who wins the overall season championship in the Stock Men category shall not be eligible to compete in the Stock Men category in the next following season. Such rider shall be automatically promoted to the Elite Men category, unless otherwise determined by the MotoSurf Committee.
Quoted from Art. 301.03.
Which boards the rulebook names for Stock Men
The category is closed from a manufacturer perspective, the only accepted board specifications are JetSurf Titanium DFI 2021 and newer JetSurf Titanium DFI models.
Art. 301.03
- JetSurf Titanium DFI 2021
- JetSurf Titanium DFI 2022
- JetSurf Titanium DFI 2023
- JetSurf Titanium DFI 2024
- JetSurf Titanium DFI SL 2025
Which of those boards are on the boards page
Of the 5 entries above, these match a model on the boards page, which names models without years:
- JetSurf Titanium DFI SL, type JT-E1, leaving the factory on FCS II Power Twin JS PG Retail Fins (R06Z085) and Center fin L200 (P004463).
Technical limits, Article 502
This article covers Stock Men and no other class.
- Power
- Art. 502 states no displacement figure at all. It defines the engine by naming the eligible model years, defers the specification to the manufacturer's published Appendix 2, and then seals it. The 106 and 212 ccm ceilings, the single cylinder rule and the naturally aspirated rule all belong to Art. 501, which covers Elite Men and Masters Men only.
- Board width
- Art. 502 states no board dimension of any kind, neither a length nor a width. Its hull requirement, at Art. 502.03 a), is that the hull specification shall be as in the named Titanium DFI model years, so in this class the board is defined by the model it is, not by a measurement a scrutineer takes. The 200 cm length belongs to Art. 501, 503, 504 and 505.
- Main fin
- 230 mm maximum height, 340 mm maximum length
Art. 502.02 b) holds the engine to the UIM homologation form printed as an appendix; its figures and tolerances are on the JetSurf engine homologation page.
- Each engine to be registered in the Stock Men class must be previously sealed by the manufacturer. The sealing consists of sealing screws set. Only fully sealed and non-damaged seals engines sets will be accepted to the race.
Art. 502.
Everything a rider may change (7)
This is the complete list, and the permission model is closed: anything the rulebook does not allow is prohibited.
- Pads and straps
- Throttle controller length
- Shut-off key protector installation on the throttle controller
- Main fin and side fins
- Graphic design
- Ball mounting in the exhaust can be removed
- Fins adjusters
Limits and requirements, with no list
Art. 501 and 505: each article states limits a board must stay inside and requirements it must meet.
-
A change that keeps every limit and requirement
goes through
- Meets the article
-
A change past a limit, or breaking a requirement
stops
- Does not meet the article
A closed list of changes
Art. 502, 503 and 504: each article lists 6 or 7 changes a rider may make, and carries the clause at Art. 502.02 a), 503.02 a) and 504.02 a).
-
A change the list or another section allows
goes through
- Allowed
-
A change no section of the rulebook allows
stops
- Prohibited
Stock Men has a closed list of changes. Art. 502.02 a) reads "Features not allowed by sections of this rulebook are prohibited." A section outside the list above can still allow a change.
How we know: The 2026 MotoSurf Rulebook, read article by article: Art. 502.01 a), 503.01 d) and 504.01 d) hold each list class's board to its standard specification and point it to its list of allowed modifications, the clause sits under each list article's engine requirements, Art. 501 and 505 hold the limits and requirements, and each article's heading names the classes it covers.
Other requirements in this article
- The permission model is closed. In the rulebook's own words, features not allowed by sections of this rulebook are prohibited.
- The Technical Scrutineer seals the engine mounting, and that seal may be opened only by the Technical Scrutineer, only for engine service.
- This class carries no measurable limit of its own. No displacement, no length, no width, no mass. Everything except the fins is defined by naming the eligible model years and pointing at the manufacturer's Appendix 2. So a Stock Men board is legal by being the right board, sealed, rather than by measuring inside a set of figures.
Fin rules for Stock Men
Side fins for the Stock Men category must be FCS fins compatible with approved adjusters. No other fins will be accepted.
Art. 502.04 d)
Art. 502.04 c) permits side fin adjusters and requires that they be available on a publicly accessible marketplace, banning prototypes, with the rider liable to be asked to prove availability.
What the rulebook publishes on fin geometry is on the MotoSurf fin rules page.
Safety gear for Stock Men in the safety articles (4)
- Helmet Art. 507.01 a)
- Life jacket Art. 507.01 c) and 507.02 c)
- Neck brace Art. 507.01 d) and 507.02 d)
- Leash Art. 507.01 e) and 507.02 e)
What each item must meet, and the kit required elsewhere, such as the environmental mat, is on the MotoSurf racing gear page.
The propulsion kit draw
For the top five riders in this class, the fuel tank, ignition control unit, sealed engine and exhaust are supplied rather than owned. Kits are drawn from a drum, fitted under supervision, and returned and sealed into boxes at the end of the weekend. No mechanic may alter a supplied kit or connect diagnostics to it. For those riders those four items sit outside the private market entirely, and the hull, fins, fin adjusters, pads, straps and throttle controller do not.
Race format: laps in Stock Men
Under Art. 307, Stock Men heats run 7 laps, 3 long, and the final, printed as F1, runs 10 laps, 3 long. The lap chart prints one line for Stock Men / Masters Men, so Masters Men rides the same laps. Race Direction may change the long laps if riders are told at the briefing or by bulletin, so these are a starting point, not a schedule.
The course, the starts and how points are scored are on the MotoSurf race format page.
Title holders named in the rulebooks
- Antony Squire, USA, printed on the 2026 cover as champion of the Stock Class.
- Minseong Kim, South Korea, printed on the 2025 cover as champion of the Stock Class.
Every season's champions, under the promoter's own class names, are on the MotoSurf champions page.
What changed since the 2025 edition
Renamed from Stock, and the minimum age fell from 18 to 15.
Read from 2026 MotoSurf Rulebook. Nothing on this page is a substitute for the published document at scrutineering.
Corrected on this page: 10 September 2026: an earlier version gave this class Art. 501's 106 and 212 ccm figures.