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Hey im new to this place and hope some of you pros can please help me. Ive got a 78 kz 650 i just assembled. i need to know where all the carb hoses go if someone could tell me in great detail. there is 2 hose connections at the petcock so i assume one is for a vac- line and one for gas. (not sure i like this setup b/c im religious about turning the gas off anyway) but want to get it running well b-4 modify anything to keep the variables to a minimum.

also i see an elbow shaped hose on the crankase (top) i assume its a vent, but should anything be connected to her?

thank you so much for the help.

The bent hose on the crankcase would fit into the airbox. This is the crankcase vent and should not be plugged; if you have an airbox it fits at the bottom, if the airbox is gone then you can buy small filters made for this vent, or attach a hose and run it behind and below the engine.

The #2 and #4 carb have vents. They are on the left side rear of the carb. Attach a hose to each one and run them either to the upper airbox area underneath the seat, or down below the carbs and to the rear of the engine.

Like you said the petcock has two tubes; one is a vacuum and the other is the fuel feed to the carbs. The vacuum is directly in the center back of the petcock and a hose attaches from this to the #2 carb. The #2 carb has a vacuum port just in front of it's vent tube; this vacuum port actuates the petcock on and off.

The fuel feed line goes in the T fitting between #2 and #3 carbs.

WOW, this place is great. thank you for the help, im out to run the hoses and give her life ( i hope). thank you.-patrick-

If you have an OFF position on the petcock you may well not have a vacuum petcock. In that case both outlets off the petcock are gas. DO NOT USE IT AS A VAC LINE. If you petcock has a PRIME/PRI position this is the case you do have a vacuum petcock.

If you do end up having a vac petcock, you can convert it to a manual one by buying some vac-caps from an auto store, put them over the vacumn fitting on the carb and the petcock. Then whenever you put the petcock in the reserve or on position, it will function as off (no vacumn cause of the fittings) and when it is set to prime it will function as on.