I’ve seen a lot of questions lately regarding maintenance on the 152FMH engine (commonly found in 125cc pit bikes and dirt bikes). These engines are robust, but parts availability and documentation can sometimes be tricky to find.
Lift the head straight off. Use a plastic scraper to remove old gasket remnants from the engine block. Installation: 152fmh engine service manual
| Component | Nm | |------------------------|----------| | Cylinder head nuts | 8–12 | | Spark plug | 10–12 | | Valve cover bolts | 5–8 | | Crankcase cover bolts | 6–10 | I’ve seen a lot of questions lately regarding
10W-40 JASO-MA (Ensure it is wet-clutch compatible). Carburetor Tuning Most 152FMH engines use a PZ19 or PZ22 carburetor. Idle Speed: 1,500 ± 100 RPM. 500 ± 100 RPM.