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Author Topic: Harley Exhaust Systems  (Read 1941 times)
« on: June 25, 2015, 03:58:51 AM »

That is the same carb our bike has - Keihin butterfly valve.  Putting an S&S Super E on it with a 1 7/8" throttle bore would probably wake it right up on the top end but the gas mileage might suffer.  We've been been getting 50-51 mpg riding two up and the Evo in our bike has been tuned for low end.  I don't know what your bike runs at, but at 60 mph the engine in ours is spinning at 2,300, at 70 mph it's turning 2,700, at 80 mph it's turning 3,100 rpm, at 90 mph it's spinning 3,500 rpm.  The Andrews cam is a little lopey below 1,800 rpm.  Have to keep it above that riding thru town or it will tend to be a bit jerky at light throttle.  As long as throttle is being applied it pulls strong from 1,500 rpm.
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