Modern Vespa

I tried googling what issues would come up if I tried to transplant a px fork into a super but kept getting solely Indonesian rebuld results.

I remember reading something along the lines that you'd have to cut through the fender to allow the shock space.

Anyone have any photos or reference links?

Does a Super have 8" or 10" wheels?

A Stella or a PX?

8.

i want to say the fork length is an issue, i was chatting about this with greasy.

i have no actual knowledge though, just hearsay.

I've converted both my VNA Allstate and VB1 Wideframe both over to 10" wheels by using a PK fork in the VNA, and a PX fork in the VB1. I also swapped in a PX fork in my pink PK200 project. The PX fork is less than optimal choice unless you do a fair about of work.

The main problem with using a PX fork is that the upper shock mount bracket is HUGE when compared to the PK. Which means when you turn the handlebars to the left, then the upper shock mount bracket will make contact with the legshield (right below the horn cast). You would have to bottom steering bearing race would need to be about 3/4" lower to get the needed steering clearance.

The other problem that's easier to remedy is creating the space for the front shock. Which means you'll need to show off your (fender) bulge skills by creating the said required space.

By now the fork will be fairly tall, so you'll have to cut and lower it to make it match the rear swingarm height. Cutting and welding a fork is super easy. Aligning it so that it's perfect before the welding IS super challenging.

I doubt if i will try to modify a PX fork again to make it fit an older vespa. The PK is so much easier, but it still requires a ton of work. For the next hydro discount brake conversion that i do, i'll keep the original vintage fork and use an off the shelf plug n play disc brake kit.


Link and pics to my rusty VB1 project. Somewhere there's pics of the fork and fender mods.
1958 VB1 200 Wideframe scuttle bucket


Link and pics to my Allstate VNA project. And somewhere in there are also pics of the fork and fender mods.
Project 61 Allstate 200 (now 208) with 2020 updates

Fork Swap for 150 Super

One thing I don't like about the PK fork is the big gap it puts between your horncast and mudguard. A PX fork gives you a gap that looks similar to original.

Cutting a hole in the guard is definitely an option. Some people like it and some don't. I don't, so found a way that avoids it.
An important point to mention though is that it moves the alignment of the shock absorber, something that Whodatschrome advises against because it places additional wear on the shock absorber. Having said that I had a YSS (not really known for exacting quality) on mine for about 9 years before the seals went and I replaced it with a BGM.

FTFY