Ear plugs?!?

But seriously, it's probably the rubber boot around the push rod were it goes through the firewall. You'll just have to get your eyes and ears closer to the pedal to find out where it is coming from.

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2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

"Beer is proof that God loves us and wants us to be happy."
Benjamin Franklin