Hi there,
I've got a SR125 and recently it's developed this problem of only seeming to run when the fuel tap is in the reserve position. When I try to run it from the on position, it sometimes won't start or if it does it will tick over but when I apply the accelator it cuts out. However, it runs fine in reserve. I got it running in the on position the other morning but having gone about a mile it suddenly started to lose all power and eventually cut out.
I really don't have a clue what to do.