2001 Ec300 Does It Have A Top End? New To Gas Gas

[MXR]

I'm so glad I found this site. I just purchased a lightly used 2001 Gas Gas EC300. It has great compression, unbelievable bottom end and midrange. However, when it hits the topend portion of the powerband it hits a wall. It just doesn't pull, it only revs. I've had Japanese 250T's with low to mid power, but they still had a topend pull. All the reviews I've read talk about it's linear power. I agree with that, until I think about the top end. Is there anything that this could be, Powervalve or something??? Is this normal going from a Japanese 2T to a Gas Gas. By the way, these bikes are incredible for technical and trail riding.
I appreciate any input you can give me. I've got no one else to ask.