I'm not to sure if this would go under repair or performance BUT it may lead to needed repairs or replacement lol.
on my '79 vespa grande my odometer and speedometer don't work. Not that they are important. but It would be cool to have a gps setup and I was thinking; my ophone does gps, odometer, and speedometer functions when I go skiing and hiking, why shouldn't it work on my moped? problem: gps functions drain the battery super fast.
so I did some quick reading: 6 volt system or 12 volt system. I believe mine is a 6 volt system. but the output can be unreliable and so to keep the bulbs and stuff from blowing, batteries can be used (even dead ones)
but an iphone is just as expensive as a new moped.
installing a USB port might be fairly easy but then if something goes wrong I might blow my phone up.
insert idea for solution: http://www.goalzero.com/shop/p/133//8:1/
IF I wired this into my moped and mounted this between the handlebars then put an iphone holder on this it would act like an extra buffer.
that would let the iphone be like a mini moped dashboard: odometer, speedometer, map, gps, radio/stereo etc.