... is there any way of playing with the springs on the carb to set it up with out a techometer ?
If you have a smartphone, you can get one of these free APPs that can measure engine RPM from the sound around the exhaust. The one I use is "Acoustic Tachometer" (Android). You have to experiment it to know when the measurement is reliable. It takes engine strokes and number of cylinder into account so you don't have to convert the numbers.