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Post by lindhe on Jan 4, 2010 18:04:29 GMT -5
This might be a total illusion/hallucination - but my scooter seems to run much better/faster/smother when I'm near having to refuel. Say 20% of the tank remaining and below.
Could that be true?
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Post by Fox on Jan 4, 2010 20:20:22 GMT -5
Sounds like the mixture is leaning out somehow toward the end of the tank.
Float height?
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Post by lindhe on Jan 4, 2010 21:13:36 GMT -5
Sounds like the mixture is leaning out somehow toward the end of the tank. Float height? Leaning out = less oil in the mix? Or does it mean less gas and more air? Whatever happens at end of tank - that's what I want to get all the time. It kicks butt! Sorry - I'm not familiar with the term "float height".... |
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Post by Fox on Jan 4, 2010 22:24:06 GMT -5
Leaning out means less fuel in the mix. The carbs on these scooters are gravity fed so the fuel pressure in the fuel line will be greater when the tank is full and decrease as the tank empties. Float height or float level refers to the level of the float in the carburetor. The float cuts off fuel flow from the tank when the fuel in the carb bowl reaches a set level. Just like the float in a toilet shuts off the water at a set level. Raising the float level increases the amount of fuel in the bowl and lowering it decreases the amount of fuel in the bowl. You raise and lower the float by bending the little tab on the float that the float pin rides on. A tiny bit of bend in the tab is all that's needed. You bend it up to lower the level and down to raise it. Increasing the amount of fuel in the bowl will increase the fuel pressure in the jet so it'll run richer. I'm not sure that the float level is what's causing your scooter to run slower with a full tank or not. I'm just throwing ideas out there. I do think that lowering your float level a little may help. See here: www.allthingsmoto.com/forums/f-15/how-set-your-motorcycle-carburetor-float-level-more-commentary-13608/ |
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