u/Drakz264

Hey everyone,
I'm having a bit of an issue with my Vespa PK 50 XL 2 and could use some expert eyes (and ears).
Whenever I hit about 50 km/h, I start hearing a distinct knocking or crackling/pinging sound coming from the engine area. Below 50 km/h, it runs perfectly fine.
Here is my current setup:
Cylinder: 85cc (Standard aftermarket cylinder, brand unknown)
Carburetor: Stock DellOrto SHB 16.15F
Main Jet (HD): 76
Engine & Gearbox: All stock
Spark Plug: Standard
I suspect it might be running too lean at top speed, causing pre-ignition/detonation, but I'm not 100% sure.
Has anyone dealt with this specific issue on an 85cc smallframe setup? Do you think a jet change (maybe trying a 78?) or a different spark plug heat range is needed? Or could it be an ignition timing issue?
Any advice on where to start troubleshooting would be greatly appreciated! Thanks in advance

Hey everyone,
I'm having a bit of an issue with my Vespa PK 50 XL 2 and could use some expert eyes (and ears).
Whenever I hit about 50 km/h, I start hearing a distinct knocking or crackling/pinging sound coming from the engine area. Below 50 km/h, it runs perfectly fine.
Here is my current setup:
Cylinder: 85cc (Standard aftermarket cylinder, brand unknown)
Carburetor: Stock DellOrto SHB 16.15F
Main Jet (HD): 76
Engine & Gearbox: All stock
Spark Plug: Standard
I suspect it might be running too lean at top speed, causing pre-ignition/detonation, but I'm not 100% sure.
Has anyone dealt with this specific issue on an 85cc smallframe setup? Do you think a jet change (maybe trying a 78?) or a different spark plug heat range is needed? Or could it be an ignition timing issue?
Any advice on where to start troubleshooting would be greatly appreciated! Thanks in advance

Please Give me honest feedback if i should start writing this.

COMRADES

Leon has never given much thought to what he believes. It was just there — like the small German town he grew up in, like Mats, his best friend since childhood.

When Mats invites him to a gathering one evening, Leon has a rough idea of what to expect. But the men there don't shout slogans. They talk. They listen. For the first time in his life, Leon feels like he belongs somewhere.

What begins as something almost ordinary pulls him deeper — step by step, barely noticeable. And by the time Leon understands where the path is leading, it is already far too late to turn back. He knows too much. He has done too much. And Mats, the friend he owes everything to, is no longer the same person.

There is only one way out. One last job.

Comrades is an unflinching story about friendship, loyalty and the quiet mechanics of radicalization — and how far down the wrong road a person can travel before realizing there is no way back.

Hey everyone,

I do a lot of wrenching on my old Vespa (carburetor, spark plug, the usual headaches) and keep running into the same problem: the knowledge for fixing this stuff is scattered everywhere – half-dead forum threads, YouTube comments, Facebook groups that often contradict each other. There's no single, searchable place where you type in "symptom X" and get a reliable, structured answer – especially for older or rare vehicles and devices (unlike modern cars, which have tons of diagnostic tools).

My idea: an app where you describe your problem (text, photo, maybe later even audio of that weird engine noise), and an AI matches it against a growing, human-verified knowledge base – symptom → likely cause → solution, including part numbers and where to get them. Every solved repair flows back into the database in a structured way, so it gets better over time instead of rotting in forum chaos.

I want to start small, just Vespas/scooters as a niche, before expanding to other vehicles and devices.

Questions for you:

• Would you use something like this if you work on old vehicles/devices?
• Where would it fail – too niche, too much effort for too little payoff, or does this already exist somewhere I've missed?
• What would be the killer feature that'd make you use it instantly?

Happy to hear honest feedback, especially the critical kind.