ORIGINAL: 8178
Interesting thought. With the OS 4S 91 apparently being replaced by the 110 eventually, what do you think SPA will do when the 91 is no longer available new?
Why do they have to do anything? The rules simply state "naturally aspirated 4 strokes can be 0.91cuin" don't they? Nothing specifically about the OS brand, right? In that case, the people who choose 4 stroke engines will have to find an alternate engine brand or choice to stay within the rules. Or keep using old engines and rebuilding them. The world moves on without regard for a business decision made by OS.
Mark