Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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This sounds like it was possibly just debris hitting a pulley or the deck being as since you cleaned it all away, the sound went away. being as this machine is new and under warranty, I would take it to your nearest Toro Dealer and have them evaluate it so it is documented incase there are future problem. I am a Toro Dealer in East TN, and that is what I advise my customers to do if they have any problem, so it gets documented as some of these mowers have issues. You model is a pretty good model to have. the 5000 series has a few quirks, but the 4225 is a pretty good machine overall. I would run it again and see if the problem returns.
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