I just bought a brand new yard machines lawn mower with a briggs and stratton 500 series 4 cycle engine at home depot about 3 weeks ago, I've used it 4 or 5 times since and today after starting it I heard a loud knocking sound like there was a rock or something in the cylinder. I turned it off and pulled the spark plug out and visually inspected and saw nothing and then with the spark plug out I pulled the starter cord a few times to see if something would blow out, but there was nothing. The spark plug is fine, there is plenty of fresh gas in the tank and the oil is brand new and at the right level. I also checked the blade to see if it was loose but it was tight and level. When I turn the blade manually there is a squealing sound coming from the cylinder and when I pull the cord the steady knocking comes back. What could be the problem?
what could have caused a bent rod ? Last time I used it a few days ago it ran absolutely fine, I shut it off, put it away and today I get this?
if you didn't run it low on oil and didn't hit anything it maybe under warranty.every once in awhile they don't get all the bolts torqued down properly,and the piston rod comes loose.take it back and have them check it.hope it helps.
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