I just bought it used at estate auction. Can't recall the exact turns, but I counted H&L turns in when I did carb clean and started out there. I have the L set at 1.5 out, the H at 2 out. Idles good and accelerates but it seems a bit slow on full throttle. Messed with it some and can't seem to improve it. There is a bit of slack in the throttle cable and couldn't get it adjusted per manual. It is an FS90R with China carb. Has C10 molded on one side below H&L. Other numbers stamped are S174A, 4180/118, 947L, all oposite the H&L side. It certainly has more umph than my FS45 that bit the dust.