I have a strange problem with a shee I bought. It wants to run rich all the time, and it takes a few seconds to get on the pipe. When I first got it, it had dual 28mm carbs and rad valves, went from 270 mains down to 200's still to rich, than I changed to a single 35mm and to fmf ram valves. Started out at 170 main went down to 157 still rich also advanced timming 4 deg. No change still hard to get on the pipe, plugs are BLACK, it will backfire if you rev it out hard when you shift, top of 4th thru 6th is doggy and it pours out smoke. I am going to change the entire electrical system piece by piece to try and find the problem. :: Anybody else ever had this kind of problem? eric