'97 CR250 idles too high

Pull the carb and check to see he slide is sitting on the bottom of the carb with the idle screw out. It may be just a cable problem or something

HI,
I owned a 97 CR250 until the middle of last year. Great engine and had the same issue after a rebuild. Found out that the crankcase gasket went bad on the flywheel side. The engine revved until I thought the thing was going to explode. Try replacing this as the engine will draw air from this area as the ignition cover on this model does not seal well.

Also the reason that this seal typically goes bad is when you crank bearing have aged to being out of tolerance. Have you replaced the bearings and rebuilt the crank since the bike was new???

Start and run the bike until it is warmed up. Afer warming it up turn off the gas and the motor should die from fuel starvation. If it continues to run and idle higher you have an air leak. The CR that I owned surged as well and the crank gasket is the problem that I found. If you would like to discuss it further call my engine builder.
www.eric-gorr.com He has great rates on repair work and did a kick butt porting job on my CR250. Made it a much friendlier bike to ride while lightning fast.

Hope this helps