Welcome! Sounds like you're qualified to help your friend through whatever problems they may encounter with the scoot.
Laducsp wrote:
Best friend about to buy a '76 Vespa, and asked for my help assessing the one he wants.
'76 vespa could be a lot of things. Any chance they know what model and/or displacement it is? If they don't know what the model is, they probably should figure that out before buying it since older vespas will need work and some can be slow as hell while others can be quite fast. Some knowledge of what they are getting into might be valuable to them.
Laducsp wrote:
What weaknesses do that vintage have?
Well, 70's US Spec Vespas are known to have funky electrical systems - kind of thrown together to meet DOT spec when really something which wasn't broke in Europe should have been left alone. Still, those electrics can work just fine if it's all there.
Laducsp wrote:
What are key enhancements/mods/updates to make them reliable and consistent performers that we shuld look for?
Avoid highly tuned pipes unless you plan on highly tuning the engine to match. Generally, the stock pipes work well enough and maybe a Sito Plus (not regular Sito), if available for the model, can open it up without sacrificing reliability.
There are cool options on some scooters to upgrade to electronic ignition. Sometimes this is more trouble than it's worth, but depending on the model that might be something to think of.
All in all, I'd recommend finding out the model before they make the leap. Even then, I'd encourage them to leave it stock for at least several months of regular riding to give them the opportunity to become accustomed to the bike. Frankly, many old Vespas are just fine stock for what they are: a scooter. At least encourage your friend to get a feel for how a healthy stock scoot should run before they begin to pimp it out... they'll have a better feel for how much they would like to tune it, if at all.
Some sweet models it might hopefully be: Rally 200 (the fastest stock vintage Vespa you can buy). Sprint Veloce (a peppy 150). A Primavera or an ET3 Primavera (fantastic smallframe scooters - good power to size/weight ratio).
Have your friend be wary of vietnamese/southeast asian restoration scooters. They tend to look gorgeous to the uninformed but can literally be death traps. Look for excessive chrome, yellow centerstand boots, and 2-tone coloring (though that will show up on legitimate scooters as a custom paint job). We have a sticky bodge thread at the top of this section with more info. They are usually "60's" era scooters, but that's not a rule.
Good luck and keep us posted!