I have the same year, same carb and I too have the same problem. We rebuilt the carb, and now it seems like it is struggling for power. the idle mix screw turned in will cause it to buck pretty bad, and lurch around(causing your body to move forward and back). with the screw turned out quite a bit, it gets much better, but mid 3rd gear, with the pedal pushed all the way to the floor there is a loss of power(i use to have full power), and if i move off the pedal to the half way point it gets power back but its still not right. 2nd gear runs good until the rpms get real high and then it starts the lurch. and then 4th gear there is just minimal power when the pedal is anymore that half way. any suggestions to check first?
