Ski Limited

Ski Limited:
The rules are the same as the 2007 IJSBA rule book with the following exceptions:

Ski Class:
The maximum cubic capacity for two strokes and four strokes with Turbo or Blower is 900cc, and 1100cc for Naturally Aspirated four strokes.
Note:
These cubic capacity figures are to show the limit size of the class, you cannot raise the cubic capacity by changing the sleeves, and you cannot alter the stroke. Engines with Hard Chrome or Nicasil must keep the OEM bore.
Note:
The EJSBA has the right to admit into the Limited classes, any new model of Ski or R/A that doesn’t reach the requirements to be admitted into stock classes. Therefore, the models that cannot race in Stock, can race in Limited by only in Stock configuration. (see stock rules).

General rules for Ski and R/A Limited:
• You can use after market ECU on two strokes and four strokes, but on turbo and blower the boost pressure can not be higher than 0.9 Bar
• No additional input or output allowed on the ECU.
• The ECU must be for sale in the after market business and every rider must have the possibility to buy one if he wishes.
• The change of the camshaft is allowed on engines “ Naturally Aspirated” but no changes to valve springs, spring seats, rockers, and any other parts from the distribution system (this rule is made to limit
the camshaft to “soft” models.
• The change of the camshaft OR the fan from the blower is also allowed on engines with blowers (not on turbos) but without changes to valve springs, spring seats, rockers, and any other parts from the distribution system (this rule is made to limit the camshaft to “soft” models.
• Re-timing of the camshaft is allowed on Naturally Aspirated and Blower engines (not on turbos).
• Size of the intercooler is free
• The use of an aftermarket charging flywheel is allowed, but the battery must be charging.
• After market engine hoods are allowed, and size of air intake is free, this rule is only for 2-Strokes Ski.
• The use of hull extensions are allowed in all Limited classes.
• 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.
• Injectors must be OEM
• You can use after market pumps.
• You can increase the cubic capacity (cc) of the engine to the legal limits of the class only if the oversized pistons exist directly from the manufacturer parts catalogue.
This rule doesn’t mean that you can’t use other kinds of over-sized pistons (e.g. ProX) it just means you cannot increase the size of the pistons above the capacity of the class (like 800cc in ski stock).

What we wish to avoid is expensive mods to your machine:
Some brands use “Hard Chrome or Nicasil” on the walls of their cylinders. With this kind of technology you don’t bore the cylinder and put oversized pistons in. No! You make a new “Hard Chrome or Nicasil” treatment on the wall of the cylinder and you put a new “original size” piston back in. That’s why you will not find over-sized pistons in the “parts catalogue” from engines using this technology. Of course you can bore this kind of cylinder bigger, but the problem is that it will be difficult and expensive to find oversize pistons. High and expensive technology is not the goal of Stock classes, that’s why we won’t allow it!