[akhaimoff]

After authorized dealers changed the carburetor on my mower, now it dose not have enough power to cut the grass. The motor don't have enough rpm's . I tried to regulate the carburetor didn't help, changed spark plug, check air filter, fuel filter fuel line, everything seems to be fine.
Problem started after they changed the carburetor, is there possibility that the carburetor they installed be diffective??
Thanks a lot.
Mower has a briggs and stratton engine.