What is wrong when a 125cc dirt bike just cut out and has no spark?

Answer 1

AnswerLook very closely at the spark plug boot where it connects to the plug wire; remove the boot and trim back the wire a slight amount then reconnect. Also check the coil connections to make sure they are clean and tight. Generally this is a simple fix ; you just have to find the bad connection.

what year 125 also what make if it has points or cdi unit if it has point you could have bad condenser if its cdi the plus coil is getting to hot after you let it sit for an hr do it start up check the coil it could be braking down when it get hot look for cracks on the coil check for bad grund at the coil here is one place that no one check on and off switch at the handle bar I have seen a lot of bikes that will run fine all day them stop why? some time the switch makes contact then the contact become poor contact and dirt get between the contact and it will drive you nuts you will think it cant be the switch it works just fine here is a new word intermittent gook luck hdflh73