Hi. I switched to a bigbore kit 750 rephased with a Powerdynamo ignition system, all done by Heidentuning in Holland. Since then, I have the problem, that the engine runs poor in idle (right zylinder runs good, left zylinder runs bad) and it backfires with smoke from the right carb (open airfilters on brand new Keihin carburators). We even went to Powerdynamo here in Berlin, they couldn't tell us why it runs so bad. So in the end I sent the whole engine back to Heidentuning - they found nothing wrong with the engine itself and tested it together with my carbs - all fine they say. So i am running out of ideas here ... Engine is fine, carbs are new, so maybe the ignition coils seem to be bad. What I heard is, since I run a rephased engine, I now have the powerdynamo set with two ignition coils and those are together placed under the tank – and if you place them too close together there can be problems with the ignition. Does anyone here in the community have similar problems with a rephased engine and bigbore750 and the powerdynamo system? Any help is welcome !