Well I would honestly think its not about the bike being fastest as it is the rider. If someone is stronger and more technically sound than other riders he would probably be faster.
You also have to consider do you want to put all your money into the lightest weight bike out there and take the chance that you break it as your learning to ride or do you want to go with a heavier bike and let it stand up to the abuse but slow you down a bit because of the weight. You have to take all of this into consideration, since I'm not really into dirt bike racing I really don't know a lot of the lines out there so I can't really recommend anything. Might try asking other BMX racers out there what they are racing on to get their opinions.
Or if your looking for questions on MOTORcycle dirt bikes you might want to try the MOTORcycle section since this is the bicycle area.
Ask a question or leave a reply