152fmh Engine Service Manual -

Drain automotive oil; refill with dedicated JASO MA motorcycle oil. Weak clutch springs

12–14 Nm (8.8–10.3 ft-lbs) applied in a star pattern. Cylinder Head Side Bolt (M6): 10 Nm (7.3 ft-lbs). Flywheel / Rotor Nut: 40–45 Nm (29.5–33.1 ft-lbs). Clutch Hub Locknut: 42 Nm (31 ft-lbs). Camshaft Sprocket Bolts (M5): 9 Nm (6.6 ft-lbs). 5. Troubleshooting Matrix Probable Cause Corrective Action Engine will not start

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Rebuild top end; install a new piston, rings, and hone cylinder. Blown head gasket

The 152FMH engine (often referred to as a 107cc or 110cc powerplant) is a small-displacement, single-cylinder, four-stroke engine widely used in pit bikes, mini-ATVs, dirt bikes, and other light off-road vehicles. It's a reliable and economical workhorse built by various manufacturers, including Loncin and Lifan, and is known for its ease of maintenance and robust design. 152fmh engine service manual

Place a pan under the engine. Remove the 17mm drain bolt located on the bottom of the engine case. Caution: Do not confuse the drain plug with the angled timing chain tensioner plug.

Inspect the cylinder wall for deep vertical scores. If the cross-hatch pattern is entirely gone, or if there is a lip at the top of the bore, the cylinder must be bored out or replaced. Drain automotive oil; refill with dedicated JASO MA

Whether you are performing routine maintenance, diagnosing a no-start condition, or undertaking a complete top-end rebuild, this comprehensive service manual provides the technical specifications, step-by-step procedures, and troubleshooting charts you need to get the job done right. 1. Engine Specifications and Torque Settings