152fmh Engine Service Manual Jun 2026

52.4 mm x 49.5 mm (standard) or 52 mm x 55.8 mm Compression Ratio: 9.0:1

Regular maintenance is critical for these engines, as they often rely on simple rather than replaceable paper ones.

Refill with 800ml of JASO MA 10W-40 oil through the dipstick hole.

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The 152FMH utilizes a simple, self-contained AC-CDI system. The engine can run completely independent of a battery if it uses a kick-starter. Component Stator Resistance Values (At 20°C / 68°F) 152fmh engine service manual

Disassemble the carburetor, remove the pilot and main jets, and clean them with carburetor cleaner and compressed air.

Start the engine and let it warm up. Turn the idle speed screw (with the external spring) until the engine idles smoothly without stalling or spinning the rear wheel. Oil Change and Screen Cleaning

If you're in need of detailed repair and maintenance instructions, I've got some good news for you. Here are a few options to get your hands on a 152FMH engine service manual:

: 110cc displacement class (specifically 107cc actual displacement) Core Specifications Engine Type: 4-Stroke, Single Cylinder, Air-Cooled, SOHC Actual Displacement: 107 cm³ Bore x Stroke: 52.4 mm × 49.5 mm Compression Ratio: 9.1:1 Maximum Power: ~7.0 HP (5.2 kW) @ 7500 RPM Maximum Torque: 7.5 Nm @ 5000 RPM This link or copies made by others cannot be deleted

For specific assembly diagrams, including the 1P52FMH-3 110cc, resources like MyPitbike.ru provide detailed diagrams and part numbers.

The CDI ignition system on the 152FMH is simple but requires solid electrical connections to function.

Check for spark, ensure fuel is reaching the bowl by loosening the carburetor drain screw, and check compression by placing a thumb over the spark plug hole while cranking.

Ensure you haven't used energy-conserving automotive oil. If you did, flush the crankcase immediately and refill with JASO MA certified fluid. Share public link Try again later

Without these numbers, you are firing the parts cannon at the engine. The manual also includes a fault tree: "No Spark? Check kill switch > Check pickup gap (0.3mm) > Check CDI unit."

Check the kill switch first, then the CDI box and stator resistance.

The 152FMH engine is a marvel of cost-effective engineering. It will run for decades if treated with respect and precision. However, "precision" does not come from guesswork. It comes from the torque wrench, the feeler gauge, and the .

Measures 300–600 Ohms to ground.