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Vaccum issues..


Jerrod R

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As far as vacuum leaks go there are not a lot of places for this to occur. Basically the carb mounting tubes and that's it. if they are properly sealed and hole free they should be fine. and be sure the caps caps are leak free ( you may want to remove the hose from the the left side tube and cap it as well just to eliminate that hose and vacuum sensor from being a part of the issue.

My next move would be to totally disconnect the throttle cables from the carbs. not easy to do with carbs fully mounted but is possible. back off the idle speed set screw (its on the left side of carb ) all the way out so there is no contact with the linkage. Carefully slide the sliders open and look down into the carb. At this point you should be able to see the throttle valves and they should be totaly closed. move the throtlle linkage on the side of the carbs and ensure it all moves freely. turn in the idle speed set screw until it just contacts the throttle linkage and the throttle plates just start to open. Then give it about 2 -3 more turns. drizzle a bit of gas a few drops only or brake clean (brake clean is safer than ether/starting fluid). Place the air cleaner back on and see if it will fire and keep running while manipulating the linkage on the side of the carb with your fingers. If you can get it to stay running Adjust the idle speed screw. If after all this you can get it to idle properly without the control cable connected than You need to look at all the cables for binding including the transition box were the cable all come together for both hand throttle and cruise control.. To get at the cable junction box you  will have to remove the left side outer and inner fairings to access this. While your at it check your not getting constant uncontrolled vacuum to the cruise control actuator or that its cable or moving parts are not binding.

https://www.partzilla.com/catalog/yamaha/motorcycle/1984/xvz12dl/handelbar-cable

 

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Edited by saddlebum
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