Not too many quad riders here. I think the motor is very similar to the 300 from the bikes so any guidance there will help. Search the threads, someone posted a link to a full rebuild a while back. Also downoad the 2006 service manual.
A couple of other thoughts.
Check jetting for a more aggressive setting, i.e. using the triple taper needles (N1EF)
Check gearing if you want top speed. A smaller rear sprocket will help accomplish this.
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2004 GasGas DE250
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