lost most power on a 2-stroke yamaha vino 50cc By supremebean (Read 384 times)

[supremebean]

hello, just bought a craigslist 2004 vino 2-stroke with 5000 miles. it wasn't running with much power, so my pop took two restrictors off of it, after which it had awesome acceleration, and got about 35 on flat ground. well, my friend wanted to ride it with me, so I let her sit on the back, and when we tried to ride it lost almost all of it's power. it alternately sounds weak or put-put janky, and gets about 8 mph on flat ground and forget about a slight incline. my dad was of the impression before this happened that the carb needed to be rebuilt, I'm curious what you folks might think? I'm about to go clean the spark plug to see if that at all helps.

[kz1000st]

I would check the exhaust system. On old two strokes you had to clean the exhaust baffles at about that mileage. I don't know how the Vino exhaust is built but I would check for removable baffles at the end of the muffler.

[clonedrone]

Way back in my day's working on 50cc Vespa Moped's I found this condition.
Had many using junk injector or premix oil, all led to the Exhaust Port Clogging or Closing up.
Very common problemo.
Same with the Pipe, Many were clogged with gue.
Drop the pipe and look up the exhaust port.
Ride On!
Clone