hello,i bought a ยด75 rd in good shape other than it was froze up,and the tank rusty.(the bike only has 169 original miles on it.)i got it running,but it only wants to run on one cylender(sometimes on two, but only for a few seconds after a new plug is put in.cleaned the carbs,the battery is new but pert near dead at this point,not getting hardly any spark at the points,will this cause these promlems ?? acts like its getting too much gas to the cylinder,pours out of tailpipe when its running. i need some advice on what to do. any and all would be appreciated,thank you.