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If, as you say, putting the clutch in reduces the sound, then it's possibly the throwout bearing. They can rattle when not engaged. (If it rattles when engaged, then it's time for a new one.)
That said, that's a bit more chunky of a clunk for a TO bearing. Time to bring out the long screwdriver to probe around for the source.
The surging is probably a lean condition or one of the regulating items is cycling when it shouldn't be.
Last edited by 917_Langheck; 11-13-2025 at 10:57 AM..
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