So I'm close to getting my Yamoto 150cc running but I'm having a problem, if I open the gas, the atv won't start. If I close the fuel line it starts and runs fine until the fuel left in the line runs out. Anyone know what the issue could be? I don't want to mess around with the carburator until Im pointed in the right direction.

Note: my brother cleaned the carb before he gave me the quad and replaced the fuel line. Could it be the size of fuel line he used?

 

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Also, any info you can give on the carb as far as what I would look for in ordering a new one would be helpful. I don't have a breather or fuel filter either so I would like to know what to look for.

 

Looks like the auto choke CD type carb used on most GY6 engines, though any I have seen use a black plastic cover on the dashpot. As I have written many times on here, to clean out carb, remove float bowl, remove jets, clean float bowl, jets and the holes they came from, out with compressed air, re-assemble and try out. No altering jet settings or mixture screws. If you want to fit a filter, put an in line one on. If that first pic is a fuel pump, put filter between pump and carb. Breathers are usually just a piece of pipe going upwards or into air filter box, top end of pipe must not be where rainwater can get in.

 

I finally got my Yamoto 150cc running today. It was the Petcock all along. Ordered a new one from Amazon, installed it in 5 minutes and now it's good to go.