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4800 rpm is a little high for a 81. My 81 only does 4500 At almost 70 mph. Either you got the rear of a 1000, or your speedo is way off. If your speedo is off, your caculations for mileage will be off. As far as your carb jets, I haven't torn mine down, so I don't know, and my clymer manual doesn't show the size. The rough idle could be caused by leaky air valves or maybe a leak in the vacum system. I'm getting about 41 mpg on the highway and God only knows when the last time this was tuned up, but it runs good and smooth. Good luck.
Gene:waving::11red::11red::11red::cooler:
4800 rpm is a little high for a 81. My 81 only does 4500 At almost 70 mph. Either you got the rear of a 1000, or your speedo is way off. If your speedo is off, your caculations for mileage will be off. As far as your carb jets, I haven't torn mine down, so I don't know, and my clymer manual doesn't show the size. The rough idle could be caused by leaky air valves or maybe a leak in the vacum system. I'm getting about 41 mpg on the highway and God only knows when the last time this was tuned up, but it runs good and smooth. Good luck.
Gene:waving::11red::11red::11red::cooler:
