Clarify Formula Colorado Class Rules for air cooled four stroke twins - as of right, it's a little ambiguous...

2.4.1 Class Displacement and Configuration Limits

Class limits are set as follows:

Formula Colorado
• Up to 430cc two cylinder, two-stroke, air-cooled
• Up to 550cc single cylinder, two-stroke
• Unlimited single cylinder, four-stroke
• Up to 600cc two cylinder, four-stroke, liquid cooled, four valves per cylinder
• Up to 700cc two cylinder, four-stroke, liquid cooled, three valves per cylinder
• Triumph Thruxton 900, Ducati 620 Supersport should be something like..... "up to XXXcc two cylinder, four stroke, air cooled xx valves per cylinder, exemptions included (blah blah specific bike)