Question about 1991 kawasaki Zephyr 750

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Have a vaccuum line that goes to nowhere from what looks to be between #2 and #3 carb on my 91 Kawasaki zephyr 750. Bike runs with hose sucking outside air but wants to stall if plugged. After going for a ride it also seems to spit gas from hose. Where does it go to.

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Usually there is a hose that connects to both number 2&3 cylinders at the front of the carbies.These two hoses commonly join together with a tee connector & a single hose comes off this tee. leaving this hose dissconnected allows the engine to **** air.This air is being drawn directly into the engine-making the mixture incorrect(too lean),as this air has not had fuel mixed with it.Therefore it needs to be re-connected to its original position(or at least pluged).
Generaly-Here in Australia- this hose connects to the fuel tap to a small spigot at the rear.
This type of fuel tap only allows fuel to flow to the carbies when there is vacume applied to the tap by that hose.This is to help stop the chance of the bike flooding.
Check this link
see the o ring marked part 670- see the part to the right with no number-it has a little spigot on the bottom- Your hose goes there.

Hope this helps
kind regards Andrew Porrelli

Posted on May 18, 2011

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