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Originally Posted by TaosTraveler
Molly Dog, I owe you several  s. Your diagnosis was right on. I replaced the O rings and changed the oil and as you suspected the crankcase was full of fuel. It is amazing how one tiny little part can have such a tremendous impact on the whole machine with potentially disasterous affects. Any other gotchas about this bike I should be aware of? 
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Good news that you found an O ring kit.  What happened to you is fairly common on carb bikes like DR650's. Certain new fuel additives also speed up O ring deterioration.
As I think i've mentioned ... you should sign onto the DR Riders forum. Helpful bunch there who know a lot more than I do.
Other common DR650 issues to address:
1.NSU bolts need to be loc-Tited (under clutch, easy fix)
2. Carry spare pulse coil (AKA Pick up coil) about $35 on aftermarket
3. Cush drive rubber inserts, replace ($65 set) before long journey or insert bits of inner tube between spacers to tighten up the fit. Smooths out drive feel, very nice.
4. start with NEW chain & sprockets if possible. (JT make affordable and good ones. Worn chain/sprockets #1 problem issue with travelers. (Pay a little now ... or pay A LOT later)
5. Add in line fuel filter, clean petcock filter and flush tank.
6. HID or LED headlight. DDM Tuning HID kits are $25 ... 3 times brighter than stock 55W headlight ... and HID only draws 35W.
7. Go to Pro Cycle on line ... very good with shipping and help/advice on the DR650. One stop shopping for everything DR650.
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