UPDATE:
beetle sorted finally,up and running perfect.got cylinder helicoiled in a local garage today for 20euro,great job its better than day one now,good to have pipe back on nice and secure......
also found out FUELING problem,the tank seal was faulty and leaking air in system,something like this can be so hard to find and diagnose and the problem is other parts can often by blamed by mistake then in return.......its a process of illemination with these things... job sorted,
THANK GOD i didnt have to buy a carb,my 813 is perfect........i had her running like a dream this evening............so much stripping and rebuilding finally paid off for me again....
i will hopefully get a nice video up tomorrow. now to instal a pico unit few more questions i may have for slawhammer.