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Interestingly enough, I just remembered something I did that also was sort of related. I was engine braking down a short, but steep hill in first gear, and (riding totally on the engine) I pushed in the clutch and felt sort of the same jolt, just once though. I assumed it was because of the engine braking torquing the motor and when I pushed in the clutch, the engine sprung back to its natural position. The two could be related...maybe when motor mounts are old and you hit the clutch with just the right frequency, it shudders the engine into a bouncy wobble?
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