1981 Yamaha XJ 650 carburetor fuel line location

The flasher is located underneath the front of the fuel tank fust behind the horn. I hope this helps. I am looking for a wiring diagram for the 1981 Yamaha XJ 650.

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.

Good Luck,
-Josh

here you go buddy

http://www.pro-bike.ro/forums/index.php?autocom=downloads&showfile=681

there is not much difference between those 2 engines. they are the same cc and both are in-line 4 cylinders.

You hve to clean the carburator and adjust the float ..plz go to this site you will find a lot of usual information to it www.xjbikes.com

Knight. (yamaha seca XJ750A 1981)