Question about 2008 Yamaha Alba

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Carb issue I am having trouble with my Yamaha alba carburators. I just cleaned them, set the fuel level to about 3MM below the gasket surface. I have syncronized them so they are all right together. They all read 8 inches. It idles great, but when I snap the throttle, it will stumble, and if I really open it the engine will stall. I noticed quite a bit of gasoline being blown backwards from the carbs. Is this normal. I have seen this with 2 cycle engines, but don't know if it is normal for a 4 cycle. I have also set the points and ignition timing. I did set the fuel level consideralby higher then the manual said. It said to set the float about 1 inch, and I set them about .675 or something like that, but what I was after was the fuel level in the bowl. It acts like a lean situation, so I raised the metering rods two notches. Could I actually be causing a flooding situation, or is it still to lean? Oh, I did a compression check, all were right around 135psi. Any help will be greatly appreciated. I bought this bike 3 weeks ago and haven't had a chance to ride it yet.

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Are you running the stock airbox??? stock jetting? i dont think those stock needles were adjustable. (i could be wrong on a 79) so they may be aftermarket needles. how many turns out do you have the air/fuel screws? how does it run down the road? does it run better on the high end or low or just bad all over? or can you even ride it?

Posted on Nov 10, 2008

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CARB PROBLEM


set the fuel level to about 3MM below the gasket surface. I have syncronized them so they are all right together. They all read 8 inches. It idles great but when I snap the throttle it will stumble and if I really open it the engine will stall. I noticed quite a bit of gasoline being blown backwards from the carbs. Is this normal. I have seen this with 2 cycle engines, but don't know if it is normal for a 4 cycle. I have also set the points and ignition timing. I did set the fuel level consideralby higher then the manual said. It said to set the float about 1 inch, and I set them about .675 or something like that, but what I was after was the fuel level in the bowl. It acts like a lean situation, so I raised the metering rods two notches. Could I actually be causing a flooding situation, or is it still to lean? Oh, I did a compression check, all were right around 135psi. ,you need to set the float level to the factory specifications.if i understand your post you have increased the fuel level height in the bowl by 3/8 of an inch and raised the needles also.the only possible result of this is too much fuel.,,,

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