cheers guys. I have tried new plugs it could possibly be coil braking down i will try the ht lead test and let you know how it goes. might just need to invest in a newer bike
I have got an old beta TR32 I have put a Tr33 engine in it as the original engine was a little broken to say the least.
This engine seems to have a problem to . it will run until it gets a little warm take around 5 minutes and then it will stop running until it cools down.
anybody got any ideas as it is starting to confuse me now.