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I know it's an old one, but my mower will start and have a high rpms to cut the grass after 10 minutes it slows down drastically. The speed control lever is on the fastest position.
Any help

Does anyone know what a 7268 is.

The Lawn Boy 7268 is a 1980 model.

There is a governor controlling the throttle plate, and an air filter (that must be clean), that will all affect the rpm.

7268's are F-engine models made from 1978 to 1982.

Filter is clean and I adjusted the governor. When I started it up it ran at a higher idle and the rpms did not go down.

Thanks for your help