RE: Welcome to Club SAITO !
If it is an old .80, he didn't have to increase the compression ratio at all. That is why some folks had trouble tuning the old high compression .80. It was designed to burn no nitro fuel and came with outstanding compression. Some Enya four-strokes are the same way. All they need is a trimmer plug in place of the glow plug and they are ready to go. Fuel with high ether content is necessary, such as DDD fuel.