and I am not talking about silencers. I have an issue which has totally baffled me and I hope members could assist with. I am running a Black Shadow on a pair of Amal carbs with a BTH magneto and it takes 10/15 minutes of cranking the engine before it bursts into life - so there is no sign of the engine trying to fire up before all of a sudden starts. Plugs are wet with a strong spark. Conways have rejetted and set up the carbs so the machine achieves a strong tickover from cold. Once started the engine run fine. I trickle the carbs with the choke at half way. Electric start. New plugs. Checked chokes are working. The fact that both cylinders fire at the same time suggests the issue lies with one component. Any ideas gratefully received.