Did this reduced top-speed thing all happen after you cleaned the carb? If so ... well.. it's probably related to tthe carb.
May as well check the points and do some normal tune up procedures while you've got your hands dirty.
That sharp point (??) you speak of must be the adjustment tab on the float.. That tab will hit a stop on the carb casting when the float is right-side-up and the hinge pin is in place.