My partners Stratos with an E-Tech on it does that and he reaches up and punches the RPM guage face with his hand and the RPMs drop back to normal. That does not mean yours is doing that but might want to thump it a few times and see if RPM guage is sticking. My Skeeter w/ a Yamaha will do that ever so often. I know I am not running faster than normal and the Mortor is not reving any higher but guage is showing about 6200. I will normally come down off the pad and slow some and if that does not help I will shut down and then reload it back up and then it works ok again. Have had it checked but won't act up when it's at the doctors office...........