Weak 300EX

[brazilian rider]

I have a 300 ex and this weekend I went to do some trails and I felt that it was really weak and had no power on it. Almost every hill I had to go on first gear.
Anyone knows what might be the problem?

[trueblue450]

get a pipe.. my 300 lacks power but i can climb all hills in 2nd and sometimes 3rd.. i would never climb in 1st gear! man you crazy???