Street Demon 625 experience so far
Thanks for sharing your experience, this was helpful as I dialed my SD 625. My engine is a 340, x-heads, stock compression, performer intake, mild cam, electronic ignition. Getting an AFR gauge revealed I was running too rich with factory settings, went "up" one size in both primary jet and rods and did a lot of playing with idle mixture screws. Now running 14's for AFR at idle and cruise, 12's for hard acceleration.