P1DRIVER is correct, 'hot and fast' is the correct way to start a 250 series engine. There is a CEB/CSL (sorry, can't remember which) addressing this issue. Some, but not all, FCU's have adjustments to control light-off temperature and the acceleration - don't get them confused. When making these adjustment you MUST have; a) an experienced engineer, b) an experienced pilot, c) a good, preferably external, power supply and, d, this is the one a lot of people forget, position the helicopter into wind.