crwdns2934241:0crwdne2934241:0 Jeff McCall

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Why is my ZTS 7500 running slow and backfiring

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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?

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Lawn Mower Craftsman ZTS 7500

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open