Well I am finding more out about My trike she is from California which have a load of emission laws so when I replaced the carburettor she is now taking in a lot more air which is now being caused by the emission regulator which British Virago's don't have so had to block up some intake pipes to reduce the intake and now its reduced its popping big time so with a little more playing with it it SHOULD finally solve the problem ,I keep telling myself its not a chore it's an adventure.