Bike runs ok until 3000rpm and then ignition becomes eratic.Definatly not a carb problem and coil/plug changed. I think it may be the tci but i will check the pickups. The tci is a 4PT-82305 . i have a 3PT82305 that i can borrow and wondered if i can use it to check if the tci is the problem.

you mean a 3TB- 82305 tci? Yes you can