Hi Matt,
give EVERYTHING else a good check over before you start thinking about top end rebuilds, look at the whole of the induction system, spark plugs - Tigthten first to see if loose, then pull and see if they are clean or oily, also operate the clutch while its running and make sure its just not this rattling a bit - they can be a little noisey sometimes on the older DR650's
I have heard of bugs making a home in someones airbox when their bike was parked up before, so look at EVERY possible minor problem first.
If you cannot find anything minor, then start to look at more serious problems including the neutral sender unit screws here:
Potential problems to be aware of - Suzuki DR650 Wiki
OHH $hit Oil Chage... - ThumperTalk;
If you cannot find anything minor, I would also drop the oil and filter it ( a paper coffee filter will work) and have a good look through it for swarf/particles etc.
This will help tell you if something is screwed in the top end.
I fitted a magnetic sump plug to my DR650 as soon as I bought it.
Good Luck and fingers crossed its something minor, let us know what you find.
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