I have a 450 and the thing has run perfectly since I bought it about 9 months ago. I took it to the dunes the other day and had a ball untill about 1pm. The bike was starting to bog and I had a moment on the beach where I couldn't get it started for about 10 minutes. I decided to call it a day then and when I got it running I went straight back to the car park, although the bike ran perfect all the way back. Some info: Riding at sea level, fuel was good, air filter had a slight dusting but nothing major. The only thing I can think of is that the day really started to warm up at about 1pm (midday heat in NSW, Australia). Would this have an affect on the bikes running? Should I be worried at all? Thanks in advance.