I need your advice! I have Vespa 150 Super (year 74'). I bought it 3 month ago, it was stated as completely restored. Anyhow after 200km it stopped, it kept starting up but was bogging oh higher revs. Now it is not starting even. I pulled it to my garage and tried to clean the carburetor and check the spark. The spark was working fine, the seller sent the new carburetor (as he thought it might be a problem). After replacing the carburetor the problems remained. I checked the points and cleaned them with sand paper, didn't help. Changed to new spark plug, didn't help.
Please check couple of videos:
Video (choke is pulled out, stops after several seconds)
Video (choke is closed, backfiring while kicking)
Maybe someone from community allready had such problems, please share an advice.