Good Day, I have a 14 Yamaha YZ250 ( 2 stroke ). I went to go for a ride today ,but was a no go. I fired it up and the thing revved to the moon and would not idle down. YZ's normally rev up a bit when first fired up, but this time it wouldn't come back down. It seemed like the idle was turned up really high. I've owned this bike since new ( no previous issues ), been running 2 strokes for ever. There has been no recent carb adjustments done, and the throttle cable is not damaged or sticking at all. The only thing I can think of is possibly the throttle position sensor, but I'm not sure how to check it . Any suugestions?