There are a few things I've been wondering. I'm in the middle of rebuilding a 1990 KX125 I bought not too long ago, and finding all sorts of stuff out as I go along. Right now, I'm contemplating a top end rebuild. I just checked the compression on the motor, and it was sitting at about 135 psi. Is this enough, and if not, what should the ideal amount of compression be for this motor? If it were say, 160 or so, how big of difference would I notice by rebuilding the top end?
Also, I heard on these cylinders, it's a good idea to have them sleeved and bored. Bumping up the displacement. I've heard it's a fairly common thing to do, and was curious about looking into this.
I JUST got done putting on my new Chain, Rear and front sprockets, (Thanks Sage!!), and I want get the rest of this done while i've got the bike torn down. I want to get back to riding!!