STIHL CHAINSAW MS 250 NO PRESSURE General Troubleshooting

Cylinder and Piston Kit

Loss of pressure or compression in a 2-stroke engine is almost exclusively caused by scoring on the cylinder walls and piston. This damage occurs when the lubrication film fails, leading to metal-on-metal contact that gouges the surfaces and prevents the piston rings from creating an airtight seal. This kit replaces the entire combustion chamber to restore factory-spec compression.

Piston Ring Set

If the cylinder wall is still smooth and can be cleaned of aluminum transfer using muriatic acid, replacing only the rings can occasionally restore compression. This is a more economical repair attempted when the scoring is superficial and restricted to the soft piston material rather than the hardened cylinder bore.

SKU: 1123 034 3006

Engine Gasket and Seal Set

Internal pressure can also be lost through leaking crankcase seals or a blown base gasket. If the piston and cylinder appear healthy upon inspection, failed seals will prevent the primary compression necessary to move fuel from the crankcase to the combustion chamber.

SKU: 1123 007 1032