Have a question on compression. I have 2 YZ`s in the garage. Mine is a 04 250 which I get 220psi out of, my sons is a 00 125. I`m able to get 160-165ish out of the 125. Is this good or are we looking at a new top end? I bought the bike used and the previous owner said that nothing had ever been done to the bike. I have no idea how many hours are on it. However it has been ridden enough to wear out the rear shock. It seems to run fine, just a bit low on power in the low rpms, to the point were I thought that maybe the power valve was stuck open. We are about 600' above sea level. Thank you for any input.