Runabout Stock

Listed below are the Stock rules and rule changes for 2008. If it doesn’t say you can do it here then you cannot do it. It is your responsibility to read and understand these rules. The changes listed below are legal for EJSBA competition only. All boats must be completely stock as of the EJSBA Stock rules.

Runaboat Stock:

Rules for Runaboat Stock:
About the Stock Classes: The general advice has been to reduce the cost of Stock racing and to bring back Stock to Stock. I have received the confirmation from many National Associations that they will follow these rules.

Homologation: To receive the homologation to race in EJSBA Racing, a production of 300 units must be sold to the final user. Maximum capacity must be less than 2000cc for two strokes and four stroke with
a turbo or blower, and 2800cc for “natural aspirated” four strokes.

Note: These cubic capacity figures are to show the limit size of the class, you can only rise up the capacities show if you use OEM oversize pistons, and you cannot alter the stroke. Engines with Hard Chrome or Nicasil linings must keep to the OEM bore size. The ratio between BHP and dry weight, claimed by the factory, must be not lower than 1:17 in R/A Stock (see JSN 1 to calculation the power to weight ratio) The Yamaha HRO, HSR-Benelli Prestige, Sea Doo 255 BPH and all the new models will be homologated if the reach a production of 300 units. Because the ratios of the above skis are higher than 1:17 they will be homologated in R/A Stock. The HSR-Benelli Race will not be homologated in R/A Stock or Limited, his ratio his 0.95.

Runaboat Stock (only) 2 Stokes:

All boats must be completely OEM (stock), with the exception of the
following modifications:
• Jets (Carbs) and any OEM adjustable setting on the carbs
• Handlebars
• Steering System
• Padding
• Trigger throttle
• Intake Grate
• Impeller
• Pump cover plate (ride plate)
• Bumpers
• One pair of sponsons (must receive the agreement of the Tec Director)
• Aftermarket bilge system
• Start engine and bendix
• You can use aftermarket a “primer kit”
• You can bore your cylinders but only use OEM oversize pistons
• Crankshaft may be rebuilt using OEM parts only.
• Any valves used within the entire cooling system must be OEM.
• Quick-turn steering modifications to alter steering ratio are allowed.
• Aftermarket steering cables will be allowed.
• Aftermarket water hoses and fuel line can be use as long as the inside diameter has the same dimensions as its OEM counterparts
• The ceramic washers on the blower from the Sea Doo post-2008 can be changed.
• The Riva OPAS kit can be used on Sea Doo
• R&D Powershot fuel injection Tuner is not allowed anymore.
• Riva in line fuel controller for GP 1300 is not allowed anymore.
• Aftermarket ECU’s or ignition box are allowed

Runaboat Stock:

Four Strokes:
• The ECU unit must be OEM and you must keep the OEM boost pressure on Turbo or Blower.
• The EJSBA has the right to interchange one OEM ECU to another on all 4-stroke boats.
• The EJSBA is permitted to fix a boost pressure manometer or regulator before the start of the race on any/every boat they wish to.

Two Strokes:
• Aftermarket ECU’s or ignition box are allowed for all 2 strokes.