tris

I have checked all the obvious things such as fuel and choke with no change. The plug is fine and sparking well. There is suction into the carburettor and there is fuel going into the carburettor so i guess it could be the carburettor, reed valves or something very mysterious. I did check the reed valves but i dont know what they are meant to look like so if you could explain that would be helpful? and any other ideas?

Hi all, I'm Tris I am 16 but i live on a farm so i can ride my bike. My first experience with bikes was a couple of years ago when i made a go-kart with my dad's help out of a Kawasaki KZ200, i then put a 250cc barrel on it to get more speed! This always broke so i moved on. My dad then found his bike, a yamaha DT250. I rebuilt most of because it was very old and it goes but it isnt reliable at all! which is annoying. I also saw a Honda CBR600 with broken spokes on ebay, so i bought it with the hope of putting the engine in some other vehicle.

My yamaha DT250 wont start It has gone not long ago but suddenly stopped. I've checked the spark which is good and cleaned out the carburetta (i dont think it is the original one though) and check the fuel. I havnt a clue what it might be, can anyone help!