from IJSBA.com

7. Engine Displacement Limits Set for Ski PWC

Item 7, Setting the default Ski Engine Displacement Limits for Ski PWC, was passed by the IJSBA Board of Directors. The default displacements took the existing maximum displacements and made a provision for coming PWC as well as the aftermarket cylinder allowance created by Item 6. Item 6 also defined the displacements for Runabout PWC.

The following are the default displacements (and maximum displacements) for the Ski Classes:

Ski Stock and Ski Limited

Normally Aspirated Two Stroke: 850cc
Normally Aspirated Four Stroke: 1100cc
Super/Turbocharged Two or Four Stroke: 800cc

Ski Open/Superstock

Normally Aspirated Two or Four Stroke: 1100cc
Super/Turbocharged Two or Four Stroke: 800cc

The following are the default displacements (and maximum displacements) for the Runabout Classes:

All Runabouts shall have an overall displacement of no greater than 2000cc. If displacement exceeds 1600cc then the maximum displacement shall be the OEM displacement of that model plus the additional volume created by a single overbore of each cylinder. The IJSBA shall publish the displacements once calculated.