This isn't a problem and it is felt with all brands, not just Saito. I have heard a lot of thoughts on this strange little quirk but none of them make a lot of sense. Last week it was doing that with one of my YS engines?? Started right up and ran great. Next flight it had plenty of compression?? I'm not going to repeat some of the reasons stated to me, some of them are just really stupid!! Peanut gallery reasons being stated!! Perhaps someone like Bill Baxter would come on and let us know what is really going on. I have my own thoughts but like the peanut gallery I won't state them because it could just be real stupid.