The 152FMH engine is a cornerstone of the small-displacement powersports world. This 110cc, horizontal, single-cylinder four-stroke engine powers millions of ATVs, dirt bikes, and mopeds globally. Known for its "Honda-style" architecture, it is prized for its simple design and rugged reliability.
Note: Keep parts organized and photographed during disassembly. Use torque specs and note bearing orientation. 152fmh engine service manual
Without the manual, you might install the thrust washer backwards, causing immediate seizure. The 152FMH engine is a cornerstone of the
Use a #17 spanner to remove the bottom drain bolt. Refill with roughly 800ml of motorcycle-specific 10W-40 oil. Oil Filter: This engine uses a permanent internal mesh strainer rather than a disposable canister filter. Spark Plug: The standard gap is typically Valve Clearance: Essential for smooth idling. Common settings are for both intake and exhaust, though some tuners prefer for the exhaust to prevent heat-related tight valves. Common Torque Specs & Parts Check oil level; refill if low