What is the Gas to oil ratio mix for chain saws?

Oil to petrol mix ratio will vary according to chainsaw make and model. Generally if the chainsaw is pre 2000 it will probably be 25:1 (i.e. 25 parts petrol to 1 part oil) Later model chainsaws can be anything from 25:1, 35:1, 40:1 or 50:1.

To be safe, you can use 25:1 in all leaner oiled chainsaws but be aware that they will smoke. Always use a high quality 2 stroke engine oil such as super outboard oil or similar. Better to be slightly oily than not.