Could my bike be suffering form this????

Question

Hesitation or Stumble When Accelerating? i posted what happened in my last question.... i have just bought a yamaha aerox 50cc and i was test driving it today and noticed it will only go up to around 20mph? but sometimes it will go all the way past 40 i do full throttle it both times when i try to achieve maximum speed but i did notice if i was going 40 plus and when i brake it will not do 40 again unless i hold the front brake and pull the throttle all the way back then take off again? anybody know anything about this? it has also just had new pistons fitted aswell......not sure when they were fitted though thanks alot =) also how could i fix it? could my scooter be suffering from engine hesitation?

Answer 1

change the spark plug

if that don't do it clean the carburetor