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Old 03-21-2013, 06:47 AM   #1
xy500 OP
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XL250r Carbies fuel level too high

I've got a problem with a 1985 XL250r, i have been having many problems with the dual carbs. But i've eliminated as many problems as i can, but one remains; too high fuel level in the carbs.

What happens is the fuel level will reach a good level, then slowly creep up until the level is above the gasket face of the carb bowl. The carbs won't overflow though for whatever reason.
If i try set the level any lower, no fuel will enter the carb bowls at all.
I've renewed the floats and needles. This problem happens with both primary and secondary carbs.

The bike runs great if i shut the fuel off and let the level drop, so the fuel level is definitely a problem. Any insights would be appreciated.
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Old 03-21-2013, 10:14 AM   #2
CycleDoc59
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I believe the float needle seat on those is
pressed in with a O ring seal which has likely
failed. A photo here shows what that would look like:
http://tinyurl.com/btnsfm7
Also, does the needle cushion spring work ok?
If it sticks, it causes float height problems. And,
sometime the float(s) get bent slightly such that
the float sides drag...
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Old 03-21-2013, 08:41 PM   #3
xy500 OP
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cheers for the insight.
The carbs on this model don't have removable seats though:
http://www.servicehondapsn.com/fiche...85&fveh=131787
I have checked with the bowls off and the fuel on, when i lift the float to when the spring on the plunger engages the fuel cuts off completely.
so the seat seems good.
The secondary float was dragging, but i bent it back straight so thats not a problem anymore...
Keep throwing those ideas at me!
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Old 03-21-2013, 09:35 PM   #4
Danjal
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Possible vacuum in the bowls? There's normally a vent on carbs,could be clogged partially not letting enough air in to offset the vac.
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Old 03-21-2013, 10:34 PM   #5
qkenf4u
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you say you fixed a dragging float.... maybe cut down your bowl gasket (or is it o-ring style on these ??) so it doesnt hold the float up ?
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Old 03-22-2013, 01:03 AM   #6
xy500 OP
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Quote:
Originally Posted by Danjal View Post
Possible vacuum in the bowls? There's normally a vent on carbs,could be clogged partially not letting enough air in to offset the vac.
The bowls overfill with the motor off, so no vacuum present. I gave them a spray out though just in case

Quote:
you say you fixed a dragging float.... maybe cut down your bowl gasket (or is it o-ring style on these ??) so it doesnt hold the float up ?
They're o-ring style rubber gaskets, thankfully as i have had to take the bowls on and off too many times! The float is two piece, and the one of the floats was dragging against the jet holding section in the middle.
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Old 03-22-2013, 05:12 AM   #7
Danjal
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Ok,so it's purely a mechanical problem then.
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