Skypig, YZ125X, not RM125X.
I sold my RM125D because my YZ125X was 500% better down low, 100% better in the midrange, and only gave up a bit in top end. (This post may include some exaggeration - but probably less than you think).
None of the above is meant to disagree with your post, BTW. ![Smiley :)](https://forum.ozvmx.com/Smileys/default/smiley.gif)
All good, I'm always smiling on this forum.
Interesting re your RM125D. Suzuki changed the motor from "case reed" on the X, to full reed on the Z and D for "more midrange". Imagine what the X is like!
Unsurprisingly, when I was a teenager moving up from a YZ80, the RM125X powerband was just fine.
Now I'm a slow old man accustomed to modern 4 strokes, its almost unridable.
I think there is still a small improvement to be had. I ran out of needle clip positions (each position richer was an improvement) and now I have the next richer needle jet in my box of tricks, which according to the experts will allow me to put the clip back in the middle.
All good fun.