I was going to post this in the newbie subforum, but thought it might be more suitable here since it is a bit technical. I've tried searching the net, and the general consensus was to not do it for cars unless you have a really old (carburetted) car. I can't seem to find anything about bikes though. So I've just remembered that an uncle of mine always blips the throttle before switching off the engine with both cars and bikes. I must admit, it does sound pretty good. But I wonder if this do the bike good or harm, and why.