I have an OS Max 91 fs Surpass also doing the same thing.... yet runs and idles fine IF fully closed top end, It's nopt the surpass II and i cant seem to find tuning info, The os site dosent show it, all others but not the surpass 1.

It used to peak on high end 1/2 tune out the yesyerday it wouldnt and does peak or VERY closed fully closed.

Ive taken the carb off and apart and totally cleaned and blown out, Perfect but still same problem.

Does anyone have factory settings on this carb?