i had a previous problem with my vespa 048, it would run but within about five mins it would die. we cleaned the carbs. and the points and the fuel line (which was clogged), hooked it all back up and now we get no spark. thought maybe we flooded it trying to adjust the fuel and got another spark plug and will try that today but just wondering if there may be something we have missed. the lights come on when we try to start it so we know the magneto is working. any ideas?