Leo, please post the long string of numbers stamped on the cooling air cowl of the engine - that is, the pressed steel cover over the upper part of the engine, with the Briggs sticker on it. The numbers are usually on the vertical left side of that cowl when viewed from the operator's position, near the top. The numbers will be in three blocks, marked Model, Type and Code. We need all three blocks. That will give us some details of the engine, including its date of manufacture. Then I'll be able to suggest an overhaul manual for you to look at as background, while we go through the maintenance process. (The Briggs overhaul manuals are all available in the manuals section of this site - we can talk about it when you've posted the string of numbers.)
