I have put 6 tanks of fuel through my savage, and yet can not get it to shift.The last 3 tanks I did lean down the carb to get some higher RPM"S out of it,and that did not seem to do the trick.I adjusted the shifting screw a little to make it shift sooner,but with no results.Do I need to just give it more time? or lean it out yet more to get higher RPM"S ? I do have a good steady stream of smoke still coming out of the exhaust. The truck runs like a top,and does not bog,hesitate or feel sluggish on top end..Any help would be nice.....thanks