Modern Vespa

I'm wondering what timing adjustments people have made when installing EI kits on stock bikes. Just installed a scoots r us ignition kit on a friends SS and after doing a bit of reading timed it at 19 BTDC.

Can anybody weigh in on this?

Simon

Simon,
What do you want to do here? Change it from 19?
Is so all you have the option of is to rotate the stator throughout the range of the three slots its mounted on.
If you still havent got the right timing figure then you'll need to file the slots out
Kevin

although re reading your post I think you're asking whats gonna happen if I play around with this stock 19deg figure?? You must know how to set it as youve just done it

19 will be about right. I did same thing on a 150 with points and asked same question. Some good info here stock points timing vs timing with CDI

Yeah, I'm just collecting opinions on setting timing at 19 BTDC rather than stock setting of 22 BTDC due to the understanding that EI ignitions burn hotter and faster.

How do they burn hotter and faster?

Not doubting yo,u just interested in the theory.

Are they saying that the discharge from a capacitor(points) is slower than that of the transistor(?) in the electronic circuit?

Kevin

the timing of old was more advanced than these modern times due to better fuel back then.

Run as advanced as you can
higher octane allows the rider to advance their timing to squeeze out a bit more power but that can go bad due to greater heat in the top end.

19 BTDC is a compromise between ease of starting, WOT power and overall reliability.

if you buy a variable ignition then you can set the idle around 23 BTDC and it shall retard to safe cool timing in the upper rpms = 15 BTDC