Modern Vespa

https://www.sip-scootershop.com/en/product/clutch-reveno-stc_REVSTC01?q=REVENO

"Information : These REVENO clutches are only suitable for use with original untuned engines that operate within the standard motors rev-range. If you wish to include this clutch in a tuned motor set up, a specially tempered base-plate will also be necessary."

Sounds fragile.

I have been curious about these, but not $450 curious yet. I would be interested in hearing how it works out, and what it does to fuel economy, because that's a good way to see how well it engages compared to the stock design.

We've tried it and it is not recommended at all.

Why not? What's bad about it?

better power transfer / less loss?

note: the numbers in the pic indelicate a 125/150

https://instagram.com/gaya_motor_baru

I just don't understand this. The clutch springs and a few other design variations can change the revs at which the clutch grabs. Once the clutch has grabbed, as the revs go up it grabs harder and harder, and I don't believe there is any slipping at higher revs that would cause power loss. At normal running revs any clutch should have locked up completely with the high centrifugal force so there would be no difference. Only take-off should be different.

Edit: Clutch taking depends on clutch revs and not engine revs, and once it has taken clutch revs are proportional to wheel revs. So if the clutch takes at 10 kph, say, then at 80 kph there is 8 times the centrifugal force preventing the clutch from slipping.

I don't claim to understand either ... just something to muse on

For all the improvements that it's going to make wouldn't it just be easier to put a Go Faster stripe on it ?

More Snake Oil me thinks.

the Go Faster stripe would have to be carbon fibre to be effective

The big issue with so much of this type of performance part is that you are essentially the Beta tester. If any of the big companies wanted to bring something like this to market, it would be tested for a long time, under different conditions. When someone invents this, they will try it, make improvements as they have problems, then put it out there. But they really haven't done the RandD necessary to know how well it's going to hold up over thousands of KM or miles.

sure. I don't feel like spending the money to be a guinea pig

General comment: I find these alternatives for various parts when surfing and get curious (in particular Insta in the Asian timezones). There are a lot of popular brands in asia that aren't ever mentioned on this forum ...