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Re: Carburetor Vacuum hose schematic
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.
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Hi, Ken one hose goes from the fuel valve to the carburetor inlet nipple, one hose goes to the float bowl nipple and is run downward towards the ground and does not attach to anything this is an overflow line, the third hose could be for a vacuum or breather nipple on the carburetor and for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix/test or parts inquiry. If necessary transport your vehicle to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. Good luck and have a nice day.
Okay,as far as I can remember this model is simple valve petrol as all dirt bikes without additional vacuum hose, right.
If it is on the left-hand tank I is the tap tap fuel.
From there to the carburetor is one hose for fuel supply and the nozzle is the height of the carburetor to the gate chamber.
All other outlets are the carburetor.
The carb diaphragms don't provide vacuum to the fuel valve...this comes from the motor sucking in as it turns. Check that the vac hose isn't split/blocked or leaking and that it is a good fit. Also blow the carb spigot through to make sure it isn't blocked
The petcock on these bikes is vacuum operated, which means that there are two hoses that go to it. The thicker hose is the fuel line and it runs from the thick port on the petcock to the fuel input on the carburetor rack. The fuel input on the carburetors is located between the number two and number three carburetor bodies. If you aren't sure which is the fuel connection, just turn the petcock switch to prime for a second and you will see gas come out of the fuel connection.
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.
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.
For the fuel pump portion you can go here - http://www.bikebandit.com/houseofmotorcycles/1992-yamaha-motorcycle-xj600sd-carburetor/o/m8199sch138373
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.