I'm having a problem with my scooter (Yamaha CW50 or Zuma (or BWSR) 2001). The engine will just not start. I checked for the spark plug, I see a spark from it. I removed the muffler pipe and I can smell the gas from it but when it's on when I use the starter or the start crank I can feel the pipe getting warm so explosion probably occur sometimes but does not get hot. Tail light is working if this help to diagnostic the problem. If you need more info just write it here and I'll do my best to answer it! I'm not THAT good at mechanics but I know how to disassemble and remount everything no problem so if I need to removed something to test no problem on this side. Anyway thank you for all help!