Lor@n

So How can I be sure that my setting is right ? What should I do ? What can I take as a reference ? because a strob light work wih the mark on the flywheel...

Hello, I hope my explanation will be clear... I have an HP4 on my PX engine (177 pinasco, 60 stroke, sipe pipe...). If I remember right I've read that some of the HP4 is not calibrated correctly, 4 degres of difference, right ? On the engine casing I've put the stator plate at 21 degres by the suggestion of people on this forum (thanks by the way). Then I've put back the HP4 to check it with a stroboscopic light, but the mark on the flywheel isn't near the mark on the flywheel cover (A and IT), let's say the mark on the flywheel cover are at 12 o'clock and the mark on the HP4 flywheel (when check with the strobo light) are at 9 or 10 o'clock. So it's not at all a problem of 4 degres but a lot more... What am I doing wrong ? or the mark on the flywheel cover should not be trusted ? So I put a PX flywheel instead of the HP4 and the timing mark with the strobo light is now near the mark on the flywheel cover but not at 21 degres like I did on the stator. The mark is on the Right of the marks A and IT. Hope someone call gimme some help. Thanks.

Hello Thanks for every hints. @Andre : Sorry for saying auto "advance", but I was thinking auto "retard". But that's true I need more 2 stroke theory, but I haven't found a good book about it in French. For the vCDI from SCK, that's what I've read on other post @Gerhard : MB ignition : it's an auto advance retard ignition more here : http://www.mbdevelopments.co.uk/lambretta/lt17.html 6 to 4 degrees variable ETA (no the basque separatist ): The ETA system has been stolen from modern scooter technoligy, to adjust timing as revs increase, fully automatically with no adjustments needed. This timing adjuster allows you to set your timing and then have it adjust automatically to promote more power across the rev range and fuel efficenty as well. Also allows safer running at higher revs. more ehre : http://www.lambretta.co.uk/lambretta/ I've also found this on the italian forum : http://www.vespaonline.com/forum/DCForumID5/9367.html and this on scooterhelp.com : http://www.scooterhelp.com/tuning/ign.timi...g.variable.html And a french friend of mine is trying to do a similar thing... but it's only the begining.

Hello, Are you using an auto advance cdi ignition on your vespa or lambretta ? Is it benefic, and which one are you using, how many degree does it vary ? I've seen one from MBD, one from DR which seems to be from a 50cc automatic scooter, and the new ETA from Tino Sacchi. Thanks for any hint.

Thanks a lot Andre ! I'll try to do it with 21°. For the HP4 that's what I had read here on the forum (by translating with babelfish), but it's strange that no one says it when I bought it. It's a new fact ?

Hello Sorry for speeking english, but I don't speak no german, but I hope you can help me. I'm running a PX engine with a Pinasco 177 + 60mm crank + PHBH30 + HP4... And I'd like to know exactly the correct degres for the ignition, do you know it, or some can tell me how to find the best degres, even with mathematics. Thanks a lot http://vintagescooters.free.fr