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I had a 445 like that once. Somehow the link from the governor to the carb was way too long. (OR was it too short?). But check your governor spring first: Your governor spring should be coiled around a bullet shaped aluminum piece that can force the governor arm forward, closing the throttle to idle. If you have something else, its been changed and you will probably need the correct parts. I saw a 335 once that had an extra spring. It worked fine with just the original spring when a bit of rust was removed from the linkage pivots. The way I checked the governor link, I disconnected it at one end. Then I started the engine, holding the carburetor throttle closed with my hand. I then pulled the governor arm back with my other hand until I felt the governor pushing back on the arm. Then I compared the disconnected link to the hole it mounts in to see what the difference was and lengthened or shortened it. I am also thinking you want the link about 1/2 a hole short, so the governor travel will definately be able to force the throttle on the carburetor closed. Meaning the governor weights are still pushing on the link when the throttle is fully closed on the carburetor. It is a good idea to have a helper near the kill switch ready to cut it off in case the engine runs away.
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