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Going to a 17 is the most for a sohc xs400. Drop the rear more ( 39-37 or 37-35) if you want even lower rpm's but remember you will lose pulling power with the taller gears.
I'm going to install a 17t front sprocket on mine. About how much should I expect to loose in RPM? I'm not really looking for more top speed just to cut some of the buzz when I'm at speed.