Its a carb issue but more than likely the internal passages are gummed up. Its probably because you have been using ethanol blended gas. The alcohol wreaks havoc with small engine carbs they were never designed to run this type of fuel. You can try to rebuild it but I have found it only works about 10% of the time. Save yourself a bunch of headaches and purchase a new one. Try to buy non-ethanol fuel or at add a fuel system cleaner everytime to fill up. The cleaner will extend the life but ultimately the new one will plug up.
Testimonial: "Thank you. My first instinct told me this was more than likely the first place to check. I appreciate your help."
Thanks for the help. This was my first impression when looking it over. The owner had a new carb but doesn’t do mechanical work.
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SOURCE: 1985 yamaha phaser. Won't keep running without
It's possible that it's fouled up with water from condensation. I would first try running a fuel drier through it - something like STP gas treatment or similar product. I shy away from the fuel system cleaners personally, but the fuel driers work by emulsifying any water in the system. This might not be the final solution but it would be a good troubleshooting step. The next step would be to remove the carbs and give them a cleaning.
SOURCE: i have a yamaha gas
it sounds like the choke is stuck in the carb if im right it has a bolt with the cable going thru it
listen the bole and free up the cable
if its not seized than the float is hanging up try tapping the side of the carb with a small hammer
you don't need to hit it very hard the reason be the needle seat is open and letting the fuel run
wild and flooding the motor out
hope this helps you
bob
The floats are not properly set or the float needle is dirty or sticking
SOURCE: Yamaha golf cart gas will only run when spray starting fluid in carb
Most likely carb bowl is dirty and /or float needle valve is clogged. Clean them and use only fresh gas afterwards. Also check filter.
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