2008 - SIKA rule book
2007 - SIKA rule book
2006 - SIKA rule book
2005 - SIKA rule book
RULE BULLETINS:
Bulletin-06-02-05-1 - Weight for the World Formula engine in the Senior 4-cycle class is changed from 450 lb. to 430 lb. effective May 24, 2005.
2004 - SIKA rule book
2003 - SIKA rule book
2002 - SIKA rule book
2001 - SIKA rule book