KTM 125 Maintance Schedule?

The best way I have found to schedule maintenance is to do a compression test when you do a fresh top end job. Record it and then from time to time check it against the rebuilt numbers and when it drops about 20% do it again.
While in there check the rod for up and down movement. It will need a crank when that happens.
Look, no 2 riders are the same just as no 2 bike are the same and thus you will find the sweet spot on needed maintenance this way.

Paw Paw

40 hours from a 125 is too much. I can feel mine starting to get tired around 15 or so. I usually do a piston every other refresh. Measure and inspect the piston after your first rebuild, if you have not sucked dirt they are usually perfect.

I change the top-end always around 12-15 hours with my 125, but most tracks around here are deep sand, where the bikes have to work very hard.

jesh I couldn't afford a 125 lol.

I've always gone 10-12 hours for rings and piston at 20-25. Bottom end at 4 pistons our when there is up and down movement in the rod