Lawnmower engine issue (B&S 5.5 hp)
We were given a reasonably new Husqvarna mower with a B&S 5.5 hp Diamond Power 4 cycle engine. The previous owner had overfilled the crankcase, but after draining the engine, cleaning the spark plug and adding new gas (with a touch of Seafoam added) the engine starts and runs.
But there is a noticeable miss as it runs. I still need to replace the air filter, and that may help, but is there anything else I can do to smooth it out?
I really don't think the machine has been used that much; it's kind of a heavy clunker and we may not keep it, but it would be nice to have it in good condition if we find somebody we could give it to.