TY 175 Cutout

[Martin K]

I have an old Yamaha TY 175 which is in really good order.

Recently it has starting cutting out after about 10 -15 minutes running. It will then start up again after about five minutes and cut out again a couple of minutes later and so on.

I have changed:
The coil
The condenser
Spark plug
HT lead

I have checked the wires running from the stator to the coil and they appear to be OK. But the bike still cuts out.

It would appear to be something thats failing when it heats up but I am at a loss and would be grateful for any suggestions.