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I've had a timing gear come apart like that before (the fiber portion was completely loose from the steel center and fell out when I removed the timing cover). In my case it still ran fine - never missed a beat on the remaining 30 miles home. At idle it would make a very bad deep knocking sound, just like a rod knock only at idle, fading as the rpms rose.
Next time the engine dies just quickly pop off the rear carb's float bowl cover and see if there is fuel in the bowl. If there is it might tend to focus attention elsewhere. (next best suspect is the ignition)
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I'm JohnMc, and I approved this message.
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