Hi Albervin,
Still got to send mine back. Spoke to BTH and they think its the coils, but I carry a spare set which I tried with no sucess. Bike is running great on the old points coil ignition system. Got to admit, reliability and the ability to trouble shoot and repair on the roadside is a always in the back of my mind, so even if the BTH is repaired, I think I am going to stick with the points coil system as its easy to repair and carry spares for this system. Even if the charging fails, the battery I have has a range of 250 miles.
The rubber boots on mine had also split so I used self amalgamating tape. I think for the cost of these units, better quality boots could have been supplied.
As for others, I have heard that two people who attended the Greek rally were having problems with BTH mags. One misfiring at revs and another difficult to start just like mine!!!!!