Need help on my QJ Supershadow 250

[vinidi]

Purchased the 250 at Xmas 2011 and since new after riding for 10/15 minutes as you accelerate it looses power and stalls. I had problems at 193kms after taking to a mechanic he cleaned carbie etc and suggested there was excess oil on air filter. Bike went well until the other day at 427kms. It should not happen to a new bike. Local mechanics are puzzled. Can anyone help?

[humanbeing]

d/l the Yamaha XV250 shop manual for the typical "specs" for DiY if u wants the bike in TOP condition. Yammie enthusiast site are more suitable than here. Most chinese clone here are based on Honda (single & twin) /Suzi (single) which aka "bullet proof" machines .

[Krasi]

I would check the following in that order:

1. Tank vent
2. Spark plug and cables
3. New coil
4. New CDI