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More than 600 Euros, that's some pricy ignition.
Got mine on sale at Stein Dinse last December and it ran about 300 USD. As I was already ordering other bits, , the shipping cost minimum (35 USD) was evenly split. The only issue I had was the clearance with the alternator cover at the front and additional 12mm spacers were added to prevent the cover from rubbing. This was omitted in the instructions, but Sachse does offer a deeper cover.....As per the Digiplex, the only way to change ignition curves is to modify the circuit board, which would run about the cost of what I paid for the Sachse.
Your point is well taken, However, I had a conversation with DR a few years back on the subject. As luck would have the swap worked well in the scenario described, but swapping in another Digiplex generally would not be a guaranteed outcome at least from what I gathered.. As inexpensive used Digiplex units ( Guzzi Content) were not available to me, a new Digi purchase was a (expensive) shot in the dark which could or could not have worked in my case ( where the ignition system worked, just not well enough for me )In the end, the methods that offered a different result were: 1) dismantle the crank case and machine the hole hole to accomodate a distributor. ( done successfully by other folks)2) Install a crank fired ignition with selectable advance curves ( easier choice)The results are speaking for themselves at this time, and this is just with the as delivered ignition map. Used Digiplex? there is one available now for those who want to try swapping..