Add 0.8L of fresh 10W-40 oil through the dipstick hole. Verify the level is between the cross-hatched marks without screwing the dipstick in. 3. Valve Clearance Adjustment (Tappet Clearance)
The 152FMH engine is one of the most ubiquitous power plants in the world of small-displacement motorcycles. From the Honda XL clone pit bikes to various street-legal 125cc enduros, the "FM" series engine is everywhere.
Insert the dipstick without screwing it in. The oil level should sit between the upper and lower crosshatch marks. Valve Clearance Adjustment 152fmh engine service manual
This PDF is a lifesaver if you are trying to: ✅ Adjust valve clearance ✅ Rebuild the top end ✅ Sort out the clutch
Ensure the main green wiring harness wire is securely fastened to a bare-metal spot on the engine block. Clean off any rust or paint. 7. Engine Top-End Disassembly and Rebuild The oil level should sit between the upper
Swap out the plug with a known working NGK CR7HSA. Ground the plug threads against the cylinder head and crank the engine.
Reset the idle speed screw so the engine idles smoothly at roughly 1,400–1,500 RPM. 5. Engine Disassembly, Inspection, and Torque Specs hard starting when cold.
1.5 to 2.0 turns out from fully seated. Float Height: 11.5mm Carburetor Adjustment Procedure Warm the engine to operating temperature.
SAE 10W-40 (standard climates) or SAE 15W-40 / 20W-50 (hot climates).
Before turning a wrench, confirm your engine identification code. The code is typically stamped into the lower left side of the crankcase, near the gear shifter. Decoding the 152FMH Engine Code: 1 : Single cylinder 52 : 52mm cylinder bore F : Natural air cooling M : Motorcycle/powersports engine H : 110cc displacement class Core Technical Specifications: Engine Type: 4-Stroke, Single Cylinder, Horizontal, OHC Displacement: 107cc (commonly marketed as 110cc) Bore x Stroke: 52.4 mm x 49.5 mm Compression Ratio: 9.0:1 or 9.1:1 Cooling System: Air-cooled Ignition Type: CDI (Capacitor Discharge Ignition) Spark Plug: NGK CR7HSA or A7TC (Gap: 0.6mm – 0.7mm)
: Tapping noise at idle, hard starting when cold.