HELP please, jianshe
 

my jianshe is making a horible vibrating sound through the chain and when i rev it while parked it can even start moving backwards a bit. Any input on the problem? it even makes this sound when im riding. When it starts to rev high. please help me. O and this isnt exactly Dan this is his brother :D o is he going to be pissed

Move backwards.... doesn't sound good. When you put it in gear does it go forwards? There used to be a problem with timing on some older 2 stroke bikes that could let them actually fire up and run backwards -- more than one poor soul found out the hard way why motorcycles weren't meant to have reverse. :wink:

it rides fine and goes fowards but when im riding it makes a horrible sound from the chain. Im impressed with the power of this little bike lol but the problem is just killing me