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I have redmax ebz 7500 runs good for a few minutes and then stops,and it will restart easy, its a pain, I have already changed the fuel filter,still does it

Inspect all fuel lines for cracks, etc. Use high test gas with Toro recommended mix for 2 cycle engine, inspect air filter also.

Sounds like carb issues. If you aren't mechanically inclined try a product called Mechanic in a Bottle, which I've found really useful fixing 'walking wounded' machines. If that fails, time for the shop.