I have an 87' DT 115 that has a couple of issues. A few seconds after accelerating to part throttle the engine will start to speed up. It runs okay at full throttle except every once in a while it will miss once or twice. Also, when giving it just a little throttle past idle it will die. So far I have disassembled and cleaned the carbs twice and rebuilt the fuel pump twice. I also have new fuel lines and filters. Could a bad crank seal be causing low fuel pump pressure? Every once in a while I will notice a little oil running down the shaft coming from the engine. Any advise would be greatly appreciated! Thanks.
