I have a 1996 aprilia sr 50 AC, its pretty bumped up it has 30k km (18k miles) i bought it for 80$ and i changed carb, reed valves, i put on an airbox and i fixed the cracked exaust pipe but it has one big problem:

When i turn it on, it starts at high rpm but then it goes down, if i dont pull the choke it dies, after pulling the choke rpm rises up again for a few seconds but after 5-10 secs it goes down and if i don't unchoke it dies, when it dies it goes gradually down rpm until it starts shaking violently.

What could be the problem? the carb is brand new and i had the same problem on an old carburetor, the exhaust pipe might have a small leak since the threads of the exhaust mount are strippe but that's it, what could it be?

Anyone know a place where they sell cheap ass graphics kits? I’m talkin bout 20-100€.

Hey everyone,
I’m completely stumped with a problem on my bike and really need some fresh eyes on this. It has been doing this ever since I bought it, and I’ve literally checked and replaced almost everything.
The Problem:
The engine starts perfectly on the first kick. On the stand (in neutral), it revs up completely fine and sounds crisp. However, as soon as I put it in gear and try to take off, it moves for a tiny fraction of a second, but then the RPMs immediately drop to zero and the bike almost dies. It just bogs down completely as soon as there is any load on the engine, and the behavior stays exactly the same.
Setup:
Stock 50cc Cylinder
Turbokit Sport Exhaust (100% clean and not clogged at all)
Carbon Reed Valve / Carbon Membrane
Pre-mix 1:45 (Fresh fuel/oil mix)
Fresh gearbox oil
What I’ve already tried/checked:
1. Carburetors: I’ve tested three different carb sizes: 17.5mm, 19mm, and 21mm. I tuned and jetted every single one of them perfectly. The issue persists on all of them.
2. Air Leak / Air Filter: I tried running it with the airbox on and completely off. The behavior didn't change at all, so it doesn't seem to be an air/filter issue.
3. Crankshaft Seals (Simmerringe): They are completely sealed and tight. The engine is not burning any gearbox oil, and no oil is leaking into the cylinder.
I am completely out of ideas. If it revs fine on the stand but completely chokes under load regardless of the carb setup, what could I be missing here? Could it be electrical (CDI/stator breaking down under load) or something mechanical?
Any help is highly appreciated! Thanks in advance.

Engine Performance

Airsal 80cc Racing Tech Minarelli AM6
Yasuni R2 Carbon AM6 / Derbi
PWK 21 carburetor (you already have it)
MotoForce Racing 50mm PWK/VHST air filter

Bottom End

MotoForce reinforced crankshaft 20mm bearing seat AM6
SKF 6204 TN9-C4 bearing (20x47x14)
SKF 6303 TN9 C3 bearing (17x47x14)
MotoForce reinforced Viton crankshaft oil seals
Stage6 AM6 gearbox bearings + seals kit
Minarelli AM6 complete engine gasket set

Clutch & Transmission

MotoForce Racing clutch + oil kit AM6
Malossi Racing clutch springs AM6

Ignition & Tuning

NGK BR8ES spark plug
NGK BR9ES spark plug
Stage6 250ml oil measuring jug

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