Originally posted by Data
so what is the one main change you can do to the engine to make it more efficient. i know there are probably many things you can do, but what change, or combination of change that will contribute the most to the gain in hp but at the same time won't increase fuel consumption too much.
Setting your clutch correctly can have just as big an effect on fuel consumption as it does on acceleration.
i did modify the needle once but accroding to my friend who tried it, he didn't really notice any changes in engine performance so i put it aside. i probably didn't do it right or i should had tested it myself. by the way, what do you think the "mid. range" screw really does ? to me it adjust the spray bar position, relative to the low end needle, but i don't really know what it does to the engine. the only thing i can think of is this adjustment controls how soon the low end needle leaves the spray bar completely. if i were on the right track, what would be the advantage/disadvantage of having the low end needle leaving the spary bar completely sooner/later ?
Moving the spraybar within the carb venturi affects when the low speed needle completely unseats from the bar. As such, you can move the powerband slightly by moving the spray bar if you also move the lowend needle in the same direction.