Your bike could be a bit lean on the mixture.
It should be at 4% at the header pipe or 2.5% if it is taken at the rear of the mufler.If you find a dealer who has the VDSTS they should be able to adjust it. The readings that Eugene is talking about has nothing to do on what the C/O is it is only a referance and no two bikes are the same, by going up in the numbers will make it richer but you dont no how much or it could be to rich already, that is why you need to have a C/o meter.The other thing it could be is the coil (plug cap), and if you havent got a good tester the best thing is to swop it with a good one and try it.
You can get a race ECU from Gas Gas that will make it rev a lot harder but they cost a lot. The other thing you could try is getting onto Tecnoresearch and they may be able to help with re maping the ECU. I dont know if the will but its worth a try.One other thing if it is an early 450 check the fuel pump relay, sometime they vibrate and cause a miss.try swoping it with the fan relay.
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