I have revved my '06 EC300 to just over 10000 RPM a number of times with no damage. With a 2 stroke you will find the power falls off when you rev it very high.
Take a look on p 59 in the Aug 2008 MotocrossDigital.com at the dyno charts for the '09 300 and 250 where you can see the max dyno reading at 9800 RPM. It is also interesting to note the 300 consistently produces more power than the 250 at any RPM above 8600 RPM.
The 300 has awesome power delivery.
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Eric K
'06 GasGas EC300
'01 GasGas XC300
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