Disconnect your throttle cables from your carb. See if you can manually move the drum on the right hand side of the carb. If it moves freely and springs back, the carb is good. Twist the grip and see what happens. Pull the two screws out of the casing that mounts to your handle bars and disconnect your cables. try twisting the grip. If the grip is good then VIOLA! You have isolated the problem. I recommend bathing the cables in WD-40. I have a 92 DR as well and that definitely made a difference for me. At this point it wouldn't hurt to remove your twist grip and clean it all out. You are at that point anyhow, may as well make it worth the mother of disassembling it all. Good luck!
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