Thanks! You can get a float needle from any carb or scooter parts house. In the USA, I prefer www.scootermercato.com . Elsewhere, I like the two big German suppliers, sip-scootershop.com and scooter-center.com .
Either the float is stuck or something has blocked a jet. Start with the jets because it's easier. Remove and separate the main jet stack into Air Corrector/Atomizer/Main, then clean all the parts among them. If that doesn't work, remove the float cover and make sure the float moves freely.
It will always spit back a little bit at idle because there's not enough air draw to atomize the fuel. if you have an air filter on the carb, it will catch a lot of it, but reduces the airflow, so you can't reach the same peak RPM's. The 24/24 carb makes the low speed spitback a little worse than a 20/20 would, because the air draw is even slower because of the greater diameter. When the needle is bad, though, the amount of fuel leaking through increases so the messy low speed intake becomes much more pronounced and causes the flooding/stalling condition. The paper towel test is the true measure of whether the float or needle are leaking.
First thing I'd check is that you don't have a blocked fuel tank breather. Loosen the tank cap and see if you get fuel flow then. If the breather gets blocked, it's like putting your finger on the top of a straw and it'll prevent fuel from flowing out of the tank. If that's the case, it's a tiny hole in the gas cap that you just need to clean out with a pick or tiny drill bit. Next, check if fuel is getting through the line. Loosen the banjo bolt (see 3:17) and make sure fuel leaks out into the airbox. If it does, you probably have a stuck float. If it doesn't, you have a pinched fuel line, a blocked fuel line, or the fuel tap is clogged. Most likely, it's going to be a pinched or maybe vapor-locked fuel line. You don't need to do anything like in this other video, but I explain the basic problem: ua-cam.com/video/Qi-RLklzWJQ/v-deo.html Reply back and lemme know what you find to start. Also, did you do anything in particular that might have changed the fuel line or carb prior to the issue?
@@davidelcess6559 That's the "correct" way to do it since there's a fuel filter built into the float bowl. The fuel line should be 24" long and run so there are no overhead loops that could form a vapor lock. I had the fuel line slide back and get pinched by the oil tank in my Sprint a few weeks ago. Frustrating to have happen, but an easy fix.
@@ChandlerHowell-Vespa 🙏 we have successfully put it back together and it runs great.. this 74 only had 6 k miles on it but it was sitting up for years.. Thanks again for your input.. I guess the carburetor was clogged up.
Main jet size wouldn't cause flooding when stopped or at low RPM's. If the jet stack wasn't screwed all the way in, it might cause behavior like this, but maybe not even then. In this case, the main was actually starving at WOT until I drilled my float passage.
Thanks bro 👍☕🔥
Great video, where did you get the needle from?
Is it original part?
Thank you
Thanks! You can get a float needle from any carb or scooter parts house. In the USA, I prefer www.scootermercato.com . Elsewhere, I like the two big German suppliers, sip-scootershop.com and scooter-center.com .
@@ChandlerHowell-Vespa thank you so much for the information
Thanks bro
I have a problem with my si carb 20.20 the automize can’t spray more, how can i do to back normal again ?
Either the float is stuck or something has blocked a jet. Start with the jets because it's easier. Remove and separate the main jet stack into Air Corrector/Atomizer/Main, then clean all the parts among them.
If that doesn't work, remove the float cover and make sure the float moves freely.
@@ChandlerHowell-Vespa ok thanks brother🙏
Sera bueno que tambien revise la balvula de admision
Si no supiera que la ingesta es buena, estaría de acuerdo, pero fue buena tanto antes como después de reemplazar la aguja del flotador.
Why was it over throughing fuel even after you changed the needle
It will always spit back a little bit at idle because there's not enough air draw to atomize the fuel. if you have an air filter on the carb, it will catch a lot of it, but reduces the airflow, so you can't reach the same peak RPM's. The 24/24 carb makes the low speed spitback a little worse than a 20/20 would, because the air draw is even slower because of the greater diameter.
When the needle is bad, though, the amount of fuel leaking through increases so the messy low speed intake becomes much more pronounced and causes the flooding/stalling condition. The paper towel test is the true measure of whether the float or needle are leaking.
Thanks.. My issue is getting gas past the float? No gas going past the intake gas line to carb??
First thing I'd check is that you don't have a blocked fuel tank breather. Loosen the tank cap and see if you get fuel flow then. If the breather gets blocked, it's like putting your finger on the top of a straw and it'll prevent fuel from flowing out of the tank. If that's the case, it's a tiny hole in the gas cap that you just need to clean out with a pick or tiny drill bit.
Next, check if fuel is getting through the line. Loosen the banjo bolt (see 3:17) and make sure fuel leaks out into the airbox. If it does, you probably have a stuck float. If it doesn't, you have a pinched fuel line, a blocked fuel line, or the fuel tap is clogged.
Most likely, it's going to be a pinched or maybe vapor-locked fuel line. You don't need to do anything like in this other video, but I explain the basic problem: ua-cam.com/video/Qi-RLklzWJQ/v-deo.html
Reply back and lemme know what you find to start. Also, did you do anything in particular that might have changed the fuel line or carb prior to the issue?
@@ChandlerHowell-Vespa the previous owner took out the gas tank fuel filter so we just ran the fuel line directly from the peacock to the bango
Thanks for your help
@@davidelcess6559 That's the "correct" way to do it since there's a fuel filter built into the float bowl. The fuel line should be 24" long and run so there are no overhead loops that could form a vapor lock.
I had the fuel line slide back and get pinched by the oil tank in my Sprint a few weeks ago. Frustrating to have happen, but an easy fix.
@@ChandlerHowell-Vespa 🙏 we have successfully put it back together and it runs great.. this 74 only had 6 k miles on it but it was sitting up for years..
Thanks again for your input.. I guess the carburetor was clogged up.
It's look your mainjet size is too big
Main jet size wouldn't cause flooding when stopped or at low RPM's. If the jet stack wasn't screwed all the way in, it might cause behavior like this, but maybe not even then.
In this case, the main was actually starving at WOT until I drilled my float passage.
Its not main jet i think it is the flot ball leavel needs to be refixed that will avoid o er throughing.
El chicler de alta estará alrededor de 90 ,si sigue tirando NAFTA hacia afuera deberías revisar la válvula rotativa de tu motor