i have a 84 gl1200 that i just bought a carb rebuild kit for. it came with mixture screws but the originals are sealed(preset). should i not mess with them or install the mixture screws? the carbs were pretty crudded up. if you do recommend putting them in, what is the setting? 3 1/2 turns out? also, what is the standard for carb #3 for when i synch the carbs? any info would be greatly appreciated!