Well, tonight was the night. I removed all of my rubber connecting the carbs to the head on my 750 K8, heated them to, to hot to touch with a heat gun and put them in a mixture of 30% baby oil 70% xylene. Wintergreen oil is just too expensive and well, if this works it takes the price way down. More answers tomorrow. If it doesn't work I'm thinking ATF fluid also. After that, as a last resort, brake fluid. My thought is to work my way from least toxic to most toxic. I think opening up the pores with xylene is the real trick in all of this. I would just replace the rubbers but at 25$ a pop, it's just plain too much money if these can be fixed. If I still have a vacuum leak after this then it's time to replace. WELL SEE.