i have a zonshen 110cc pitbike ive just got it to start but it has spewed oil out of the engine breather pipe so emptied a bit out the exhaust is glowing orange when it gets going also when i try to open the throttle it pops and the engine cuts out does anyone know what could be causing it plz

rebtash, January 2011

like crispy says sounds like its running weak or advanced.

adam bike doctor(of milton keynes motorcycle centre), January 2011

Hi mate, the oil could be rebore & rings, new piston if its badly scored. Check the timing either too far advanced or too far retarded. Check valve clearances (tappets). Check mixture, sounds very weak but is not the only cause of popping & banging, float height, needle position, fuel delivery, inlet manifold split. Prolonged use of throttle while stationary wont help(red exhaust)Check each one at a time & hopefully you'll find the gremlin. Another engine might be the answer though.

Chris P.Duck, January 2011