The dynastart pulley is dead easy to source. There is no need to modify the existing pulley and this is why I personally think it is easier to restore old vehicles today. And I cannot take credit for all of this because the answers were posted elsewhere on this forum.
The dynastart shaft is 17mm in diameter, whereas the original dynamo shaft is 15mm.
If you search online for a "taper lock bush", this will take you to any one of several companies supplying parts for power transmission. A taper lock bush is a part designed to allow any size of pulley, including multi belt pulleys, to a shaft. I did a search on one company website for a taper lock bush for a 17mm shaft and on the same company for a 71mm diameter pulley and SPZ637 v belt. All these items have been mentioned on posts on this forum already. And don't be afraid to use the cast iron pulley. These bikes weigh a ton already so a few more pounds doesn't make any difference.
The dynastart itself is no more than a dynamo with an extra set of components to turn it into a motor when required.
Again, all has been posted on this forum before. However, you do not need the special regulator for the dynastart. By wiring in a Lucas SRB325 solenoid/relay to the standard militare regulator you can operate a dynastart. You just have to follow the instructions (translate from Italian) previously posted. Mounting the Lucas relay is a challenge as it is quite large, but I will hide mine at the back of a side panel box to shorten the main cable runs. The starter button will be on the right handlebar with power taken from the fuseboard and the 2nd wire to a terminal on the relay.
This is definitely not rocket science. It just takes patience and time.
What with a halogen headlight, headlight relays, horn relay, indicators, LED tail/stop light and electric start, this bike is definitely not standard!
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