I have a 98 sportster that runs around 33. I was told it should run around 43. I've noticed that the first inch of the throttle lever has no engine response. After that, the engine starts to respond. With the engines off, I pushed the throttle all the way forward and looked under the carbs and I was able to push the throttle arm about an inch worth. This is the same amount I am lacking on the low end. Could it be that my cable has stretched over the years and needs to be tightened?