hi Martin, thanks. so i cut the vespa starter ring from 93 to 80 teeth and weld it. then i manually shape it to get around 155mm internal diameter. and it perfectly fit under the flywheel cover
i use bgm stator which is already 12V. most of electronic kits available for Lambretta now using 12V. so attached with 12V rectifier so it will be no problem to recharge
BGM are overpriced, by a generic Indian lambretta 12v conversion stator. Had mine for 20 years. Buy kytronic ignition module it has 15 settings for £90. Variotronic again over priced nonsense.