Why is my ZTS 7500 running slow and backfiring

I have a ZTS7500. It was moving slow and backfires when I dropped the blades down I checked to find the plugs black and filters clogged. I changed plugs and filters kit. Not much change when dropping the blades down. Still rolls slower than normal and backfires. Oil level is fine. What do you suggest?

Answer this question I have this problem too

Is this a good question?

Score 0
Add a comment