KymcoForum.com
General => General Discussion => Topic started by: salter on January 24, 2017, 05:44:00 PM
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I have a Kymco 50cc Super Fever that was left abandoned at my son's house. I think that it may have a fuel/carbureter issue. I disconnected the fuel line just above the fuel filter so that I could drain the tank and put in fresh fuel. The fuel is only dribbling out at a very slow pace - a drop every couple of seconds. Shouldn't the flow be faster than this? Might the fuel petcock need to be cleaned or replaced? If it needs to be cleaned, any advice on how to clean it? Can you think of anything else that might be causing a blockage?
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Kymco 50cc Super Fever (http://motorscooterguide.net/Kymco/ZX50/ZX50.html)
Insert an infant aspirator into the fuel petcock vacuum line.
(http://i.imgur.com/i88DzSZ.jpg)
Jet cleaning (http://www.urbanscootin.com/forum/viewtopic.php?f=2&t=16373) . . reed inspection (https://youtu.be/of61ZBa-deA) . . check muffler for nesting insect and carbon obstruction.
No mention if you have verified spark or tested cylinder compression?
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Tortoise, thank you for the child aspirator tip. It worked well.
Today I will test spark and fuel flow. Thx.
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As to your question about the the fuel flow, or lack of it. You have two tubes going up into the tank. One is shorter than the other one and both have wire tube type filters on them. Really old gas can congeal on these filters and stop or slow the fuel flow out of the petcock. Also the petcock is made of aluminum and over time can oxidize and get completely stopped up. Remove the two screws holding the petcock and very gently rock it back and forth and then pull it out. The rubber seal under the petcock can possibly be cleaned up and reused. NEVER put carburetor cleaner on rubber or other gaskets. If it has been sitting several years, the tank is probably full of rust and will need to be cleaned and resealed. If it's long lay up is all that is wrong with the bike, it can be gone thru and cleaned out and made to run again. Might want to try and turn the motor, by hand to make sure that it isn't stuck. If it turns then take out the spark plug and put some light oil into the cylinder and then turn it some more to coat the cylinder walls and rings.
Cleaning the carburetor isn't always a DIY project. Might want to get someone to help you with that. It's not a hard job unless you've never done before.
Hope this info will be helpful to you. Good luck.
Mac, aka "ole two wheels"
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If the scoots been siting for a while It would be best to clean the carb or replace. But do replace all the gas lines comeing and going to the carb and the tank. Replace the gas filter and the petcock or clean very good. fresh oil would be good to. Clean is good.
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Thanks for all the advice from everyone.. I took off petcock filter and it had a lot of rust/gunk inside. I cleaned out with gasoline. I charged the battery. The scooter starts and will idle for a short time. If I try to slowly rev it dies. I checked the fuel flow to the carburettor and that seems to be flowing OK. Is it most likely that the carburettor needs to be cleaned?
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Yes. Starts and idles OK means auto bystarter and idle jet are working. No throttle response means main jet plugged.
Karl