ok i got a 78 puch free spirit that iv just finished rebuilding. after some adjustments we finally got it sparking. iv also got my carb filling with gas so i know its got gas. and its obvious that its got compression. now a few nights ago it started up and was running but only when i gave it gas, if i cut the gas off it would die immediatly. but now it wont even start. we checked and were still getting spark, i took off the petcock and it was clogged so i cleaned it and put a filter in. now thats working fine and im getting plenty of gas into my carb but for some reason the moped wont start. any suggestions?