intermitent exup fault,any ideas?

[portboy]

I'm a bit old skool as far as exhaust systems go, only ever used to tuning British 4 stroke twins and rule of thumb was always providing the top end had the right ammount of fuel and air get rid of it via the exhaust as quick as possible ( it was said 11 inches of pipe from the exhaust port was the optimum length ). So why on earth have this chunk of casting blocking your escaping gas ? My Gen 1 1000 has been Ivanised and such was the state of my exup system apart from the servo and the outer cables, the rest completly unserviceable that i have removed it. Contary to many comments made and possibly about to be made it has made no difference in my opinion, the engine performs outstandingly.

Stand back..