Question about 1985 Honda XR 250 R

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Carburetor Vacuum hose schematic

Can I get a free copy of this?

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The 1985 XR 250 does not have a vacuum hose that has any function as to how the carburetor works. All the hoses are atmospheric vent tube that keep the pressure consistent in the float bowl. The other tubes are simply over flow tubes in the event the bike dumps on its side or if the float sticks open.

Posted on Nov 30, 2008

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Working on a friends 81 yamaha 650xs. I removed and cleaned the carbs and put them back on but can t remember how the T hose from the petcock to the carbs hook up. Can someone help me


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The thinner hose on the petcock is a vacuum line. It runs from the vacuum port on the #3 cylinder (between the carburetor body and the engine) up to the smaller connection on your petcock. When the engine is turning vacuum is applied to this thinner line and allows fuel to run from the tank into the carburetors.
joshorndorff.jpg

There are the only two lines that should run to your petcock, and the fuel line should not be split anywhere between the petcock and the carburetors.

Good Luck,
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Two hoses come from the intake area under the carburetors - the small hose on the left side (facing front) which is directly under #1 intake goes to the Fuel Petcock vacuum input. The hose under #2 intake goes to the Fuel Pump - vacuum intake (marked with P). The left side of the fuel pump is the input for fuel - the right side is the output for the fuel pump - the hose goes up to the small T input between carburetor 2 and 3. The input for the fuel pump has an inline fuel filter and that runs up to the Fuel Petcock fuel outlet.

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Should get a good view of it by downloding free manual at
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