Hi, i hav bought santro GV 2005.it is 81k km driven.Engine and body is in perfect condition.The problem is that when i start the engine, a slight noise (may b slight high RPM) comes as i hav pressed the race padle slightly.i want to know is it normal thing ?After few seconds its goes to the normal rpm.What should i do now? Secondly, after how many km i should change the timing belt/bearings?