Could someone please explain to me why some bikers pull the clutch in and blip the throttle when they are coming to a stop. Also they seem to start their engines several minutes before they drive away and leave them running after they stop, usually accompanied by several throttle blips and rev ups. Is this necessary for the correct performance of their bikes, or their egos. Apologies to anyone who owns a bike that needs this but it does make the others look like nobs.
Yeah, on a bike engine braking is a BIG factor - shift down without matching engine speed to road speed and you can lock up the rear wheel. It really is massively more important than in a car. The odd blip aftewards is probably just pyschological - with most bikes revving to over 12,000 rpm sitting at the lights with the needle at nearer 1,500 rpm sometimes feels like it's about to stall on you so you give it a blip just to be sure.
As to starting them up before riding off, many (but not all) bikes are carb-fed rather than fuel injection. Although this is changing with the latest tackle (i.e. seriously nice fuel injection systems and other niceties), it still follows that if you don't warm up before hand you can get a jerky throttle response - again this has massivley more effect on you when you're on a bike!
As to blipping when you've finished your ride, other than combatting heat-soak, yeah it probably is just to enjoy the sound of the bike one last time
Probably a bit all of the other times as well, but hey, if Alfa owners can appreciate those V6's on song, the odd blip on a nice bike surely is acceptable!