Cylinder head for Viper 125-200 cc motorcycles and similar (China, Minsk). It closes the cylinder from above and forms the combustion chamber; it houses the spark plug and the valves with the valve train.
Replace it if it has cracks, burn-through, a warped mating surface or a stripped spark plug thread. Tighten the fasteners evenly and replace the gasket.
- Before assembly, clean and inspect the seating surfaces.
- Lubricate the rubbing parts with engine oil and run the engine in at moderate rpm.
