This problem happens only accasionally, but its a little unnerving, when Im riding and back off the throttle, then go to open it again its like the throttle has a catch in it its like stuck for a second, then there is a "click" you can feel in the throttle and it then opens normally,and you can twist it over and over and everythings fine. you never know when its going to catch. any Ideas what it can be? Ive already lubed the linkage between the 2 throttle bodies with spray lube and its made no difference, otherwise the cable operates smoothly,and returns quickly. Thanks.