Yes you can run more timing even on gasoline than the recommended 28 but there is no power gain. Alky burns just slightly faster than gas but you can certainly try a little more timing lead to see if it helps. I've moved my Saito 91 on gas to as high as 38 degs with absolutely no problems. It idles better though at 30 so that's where I run now. (I can't tell the difference between 28 and 30 for that matter) Any slower than 28 to 30 and it starts losing top end power. Definitely experiment with yours to find the best tune, just remember these cylinders are very tiny and it doesn't take long for the flame front to propagate across the chamber which is why they don't need very much advance. Good luck with your Saito conversion.