Modern Vespa

I have installed a vespatronic ignition on my Vespa Rally. On the femsa system there was no possibility to do adjustments. On the Vespatronic there obviously is. Right now I have the screws in the middle of the holes. What should the advance be for the Vespatronic on a Rally? It seems very hard to get an answer?

If I were you , I would swap out the CDI for static timing and set it at 23 btdc. https://www.scooter-center.com/en/cdi-bgm-pro-with-fixed-timing-for-idm-ignition-type-ducati-blue-vespa-px-pk-lambretta-used-for-polini-idm-vespatronic-vespower-varitronic-flytech-parmakit-bgm6697?number=BGM6697


Beyond that , you could try around 28-25 for variable. I personally like the static ignition for that cylinder.

The best thing in the market is Vape ignition for your Rally.

Just got the unit installed. I really don´t want to replace the CDI. The Vespatronic was quite expensive. I will try around 28-25 degrees advance. I have a stock engine. It is strange that the manufacturer does not have any information about the advance?

That BGM CDI box that Gick linked is worth getting. The CDI boxes with advance are made higher revving motors and expansion pipes.

Everyone that I have talked to using a box with advance on a stock or aftermarket cylinder and box pipe has ended up with some slight hesitation somewhere in the rev range. It's irritation when you are riding. I spent a lot of time adjusting jets and timing before switching to the BGM static timing box. That fixed everything.

Seems like the BGM CDI box is the solution? Should the advance be 24 degrees with that box?

the fancy words for the BGM make no sense to me. There is no "Curve" on any of these and there is no ignition pickup. this style of ignition triggers on the rise of the primary coil output and there some static time before the spark does its thing. As the RPM goes up and this delay stays the same length the advance is reduced linearly. without adding a pickup and more electronic wizardry the BGM is not going to change that.

That said I'd pick up the BGM if I have to replace the coil just for the fact that the high-tension lead is replaceable.

Stock timing was 23° BTDC. I think I set mine at ~20° at idle and let it fall a bit from there at high RPM. Works better with modern fuels IMHO.

Vespatronic states, "Timing adjusts automatically, with a pre programmed curve of up to 8 degrees."

My guess is that the advance comes on too quick with the way these Vespatronic boxes are pre-programmed, or 8 degrees is too much for a relatively low revving city bike with a box pipe.. The BGM box keeps the timing static.