Clattering Sound When in 5th Gear

dps650rider

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Was out for a leisurely evening cruise and suddenly started hearing a clattering sound. At first I thought it was a valve but as I played around with it I discovered it didn't make a sound under any other conditions except in 5th gear. Rode the rest of the way home in 4th without a bit of unusual noise.

Looks like a transmission tear down is in order but I am a bit mystified how a gear problem could make such a sound. I tried several times to recreate this sound in 4th at the same RPM and at various throttle settings but it was silent.

Anybody have any ideas?
 
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