I have a 1980 sachs seville, 505-1d motor, i was crusing today and it sounded like the transmission flipped into neutral, it reved up but i was going nowhere, so i shut it off. Now it wont start, the decompression lever doesnt seem to work. I checked the cable and everything but the pedal never seems to get any harder to pedal. It also doesnt seem that to motor turns over, it did a few times when i had the spark plug out, but doesnt when its it. Any ideas? Thanks!!