What makes you think its the fuel cap?
Sounds more like a blocked breather pipe,or something.Have a look under the tank for any kinked or damaged pipes.i had a home made gasket in it because of leak when tank is full. once gasket failed , it stalled or even died(when i twisted hard). sometimes it would restart other times i had to turn off and turn on again to start.
Sounds more like a blocked breather pipe,or something.Have a look under the tank for any kinked or damaged pipes.
Very difficult to diagnose what is happening with the little amount of info given.Could be anything from a loose tilt switch,weak battery,fuelling issues or any other problem.
What have you checked so far?
Blocked breather pipe?
Have you just changed your cans. as some T's can be effercted by some end cans.
Duff plugs.
Failing that a match to it.:lol