crsracing

Well I live in Nova Scotia Canada im roughly 90 feet above sea level ( 28 meter ) What should my compression be at for pump gas ? ......you say i will have to check it to figure it out . just wondering where it should be at ....Thanks .

Ok guys here it is , im new to the site and couldnt find anything on this topic and need some help . I bought a banshee that was run on 50/50 av gas . And i want to switch it back to pump gas just because its alot more practical for me to use pump gas . Av gas is hard to get where i live . So lets start with whats done to the bike . It has 4 mil crank with cub cylinders , cool head (not sure of dome size ) 35 mm carbs dune port and polish and +9 advantaced timing ( i think) . Like i said i bought the bike already done so not real sure about some things but was all done right beautiful bike hauls ass lol. Anyways my questions is how do i convert it back to pump gas ???? I was told change the domes to like 20cc and set timing back to +4 and i should be good to go ???? any help on this would be great thanks.