So alot of people having the "popping on deceleration" issue got me thinking. Usually not a good thing, but thought I would get some opinions anyway. We all seem to be of concensus that this is a lean condition. Either pilot jet/ fuel screw or air coming in the exhaust joints. Now follow me here. Lower octane fuel such as pump gas doesn't provide the most complete burn compared to say a race fuel. Is it possible this popping is actually unburned fuel? I only ? this because I am running a race fuel blend and don't seem to experience alot of the jetting/ backfiring issues I see from other forum members. To put you rocket scientists out there to the test. Could someone please explain to me how lower octane fuel makes more power in nothing except single cylinder 4 strokes? Some jetting is necessary, but I have yet to see a 2-stroke snowmobile or dirtbike that didn't benefit from higher octane fuel. Why don't dirt track stock cars just fill 87 at the pump? My Husky rocks on 98 octane, but yet it is supposed to run better on 92 (which it doesn't)? This goes against everything I have learned since I was a teenager. Technically, I should be able to add more timing advance and make even more power with high octane. Not to mention the slower burn allowing you to give the motor more fuel. Just looking to get some thoughts from those of you more knowledgable types out there. Hopefully George can throw some facts our way. Happy 4th of July everyone!