I second the suggestion about lubricating the linkage...if it's dirty and/or dry it can stick and not move properly...there's a lot going on there, make sure it's all oiled and adjusted properly.
My STOP lever takes a pretty hard push to make it work also....If I just push it comfortably with my finger it won't shut off, but if I push it hard with the palm of my hand, it works fine.
Mike
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