152fmh Engine Service Manual

With the correct service manual in hand, you’ll transform from a frustrated parts-changer into a confident engine builder. Remember: the 152FMH is simple, but simple does not mean imprecise. Respect the manual, and your little 125 will run forever.

Set the idle speed screw until the engine idles slightly high (~1,500 RPM).

Remove the float bowl screws from the bottom of the carburetor. Pull out the float pin, float, and needle valve. 152fmh engine service manual

Let the oil drain completely. Clean the magnetic tip of the drain plug to remove metal shavings. Inspect the crushing washer; replace it if flattened. Reinstall: Re-torque the drain plug to 22 Nm.

152FMH engine is a popular 110cc, horizontal, 4-stroke single-cylinder engine widely used in pit bikes, ATVs, and small motorcycles. Servicing this engine is straightforward, as it shares many design elements with the classic Honda Cub (C100/C110) architecture. Core Engine Specifications Displacement: 4-Stroke, Air-Cooled. Horizontal cylinder. Electric and/or Kick Start. Typically a 4-speed manual (1-N-2-3-4) or semi-automatic. Routine Service & Maintenance With the correct service manual in hand, you’ll

Remove the right-side crankcase cover access cap to clean the internal oil screen mesh filter using parts cleaner.

Hold the adjuster screw stationary while tightening the locknut. Set the idle speed screw until the engine

When compression drops below or the engine exhibits heavy blue smoke from the exhaust, a top-end rebuild (piston, rings, and valve seals) is necessary. Disassembly Checklist