Be cautious: Many online PDFs are for the Honda CG125 or CB125. While similar, there are critical differences in clutch assembly, CDI timing maps, and bolt thread pitches (JIS vs. metric). For the 152FMH specifically:
If your engine is beyond simple service, you can find a complete replacement 152FMH on sites like Motor-X or Motor-X (oil-free) . These sets often include the carburetor and necessary gaskets to get you back on the road or trail quickly. 152fmh engine service manual