I recently got a custom moped for free. It didn't run when I got it. It is equipped with a solo engine, water cooling, I believe type 254 or 255. The carburetor is a Runtong (clone of Dellorto), I have no idea what size it is but this page says it is 15mm.
I am slightly confused because this page says that the original carburetor was a bing 1/10/112 which is a 10mm.
The engine starts with starting fluid but does not stay running, with the gas line attached and a temporary fuel tank (the gas tank had rust and whoever was running it before me was not using a fuel filter). I took the carb all apart, cleaned with carb cleaner took off float bowl, took out slide, ran wire and carb cleaner through jet, took off banjo and screen which was caked with rust and cleaned it all out. Engine still wont run without starter fluid.
My ideas on what it could be:
Fuel type: The original manual said to use 25:1 but the manual is very old so I'm not sure if that is accurate for modern fuel/oil. I am currently using 40:1.
Carb is still clogged: I am far from a carburetor expert so I could be missing something.
Wrong startup procedure: Right now I am spraying starter fluid, holding down starter clutch, kicking it over, and then opening the throttle. It has a lever choke, should I be putting that on too? My throttle cable is not the best but it still lifts the slide when I test it, but once the engine is running it'll run for 5-10 seconds at the same speed seemingly regardless of the amount I open the throttle, that's why I'm thinking it may only be running off the starter fluid but 10 seconds seems like a long time to run off that.
Sorry for the long rambling post, I'm new to this and trying to diagnose with a lot of variables that I've never seen before.