Decided to strip the Kat down the other day to give the carbs a bit of a clean out - been running fine just decided to do it for the sake of it. First annoyance was the realisation that the Kat airbox goes in before the engine, and being larger than the frame wasn't going to come out (curse you Suzuki). Anyway worked around it and discovered that the rubber tube connecting the airbox to one of the carbs was leaking - not surprising since that one was being held on by a cabletie and not a proper clamp . Anyway fixed that (and replaced the fuel line whilst I was at it) and I've already noticed that the engine runs better, especially at low revs (had to drop the idle speed) but can't quite work out how an air leak affects the engine like that. Anyone want to give me the technical explanation?