Well, 1st off you have a DR..the difference between them is if it's equipped with reverse..
Second..if I understand your problem. It sounds more like a carb/throttle cable issue..you hit the throttle and the idle spikes up and sticks.
Possible throttle plate sticking, cable binding, or air leak issue..
Unless there is more information that you can give to clarify!!
Current toys..
1986 Honda 350X..trail bomb!
1985 Honda 250SX..my main mudder
1985 Honda 250ES..Back in Black Trike
Current non-trike toys:
1990 Honda TRX300FW
1995 Seadoo GTX
1998 Polaris Indy Lite 340(Nearly new looking)
1998 Polaris Touring 500
1998 Club Car (electric)