78 kz400 b1 fuel and vacuum lines ???

  • gumby prichard
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78 kz400 b1 fuel and vacuum lines ???

17 Apr 2011 22:41
#445207
Can someone pleaassssssseeeeeee post a picture of where the fuel and vacuum lines go on a kz400 b1 carburetors and petcock!! I have looked for days and cant find these pictures anywhere. I even have the service manual...and it's no where in there. Im thinking this is why my bike wont start, because i have the vacuum lines connected wrong. Story is, i did the whole 2 to 1 conversion and got the bike running strong.... a little too strong. I bought a 37mm keihin instead of a 35mm and didnt want to fool with the 2-1 thing anymore. I put my dual carbs back on and now it wont start. i think its because it's flooded. I keep it on prime. Please help!!!!!
Thanks in advance!!
-Derek-
78 kz750 twin
77 yz125
91 cr250
99 dr650

ex's:
78 kz400 b1
89 yz80
99 klx300

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  • Patton
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Re: 78 kz400 b1 fuel and vacuum lines ???

17 Apr 2011 23:18 - 17 Apr 2011 23:20
#445218
gumby prichard wrote: Can someone pleaassssssseeeeeee post a picture of where the fuel and vacuum lines go on a kz400 b1 carburetors and petcock!! I have looked for days and cant find these pictures anywhere. I even have the service manual...and it's no where in there. Im thinking this is why my bike wont start, because i have the vacuum lines connected wrong. Story is, i did the whole 2 to 1 conversion and got the bike running strong.... a little too strong. I bought a 37mm keihin instead of a 35mm and didnt want to fool with the 2-1 thing anymore. I put my dual carbs back on and now it wont start. i think its because it's flooded. I keep it on prime. Please help!!!!!
Thanks in advance!!
-Derek-

Pic for reference (see below).

My best guess until better advice comes along is #36 (blue) vent line, #31 (yellow) fuel line, and #19 (green) vacuum to petcock.

Good Fortune! :)

1973 Z1
KZ900 LTD

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Last edit: 17 Apr 2011 23:20 by Patton.
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Re: 78 kz400 b1 fuel and vacuum lines ???

17 Apr 2011 23:24
#445219
If not already familiar, may find a lot of good info with this link:

Click > www.armbell.com/forum/index.php?c=6&sid=...571a51a&mforum=kz400

Good Fortune! :)
1973 Z1
KZ900 LTD

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  • gumby prichard
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Re: 78 kz400 b1 fuel and vacuum lines ???

18 Apr 2011 05:02
#445273
Yes! Thanks so much. Now heres where im confused. If you look at line 17/18 i know where that spout is on the carburetor but where does the other end plug into??? also what is the difference between the on and prime position on the petcock?
78 kz750 twin
77 yz125
91 cr250
99 dr650

ex's:
78 kz400 b1
89 yz80
99 klx300

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  • gumby prichard
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Re: 78 kz400 b1 fuel and vacuum lines ???

18 Apr 2011 05:27
#445274
sorry i meant 19:pinch: also i looked into a bunch of those threads. and i just want to ask why do four stroke carburetors have to be so complex? i mean each carburetor has four jets....if not more....wtf! so if this whole fuel/ vacuum line thing doesnt work what would you try next? I already made sure the jets were clear. i cleaned the bowls, but have not made sure the floats float nor have i cleaned the needle valves. :huh: :blush: Maybe? anyway...god im thinking maybe trading my 37mm carb for a 35mm carb, rejetting it yet again, and rewiring my throttle side switches to aftermarket switches may be worth it after all......:unsure: opinions please?
78 kz750 twin
77 yz125
91 cr250
99 dr650

ex's:
78 kz400 b1
89 yz80
99 klx300

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  • wyldchyld69
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Re: 78 kz400 b1 fuel and vacuum lines ???

19 Apr 2011 10:35
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I just got my carbs back together. I have a kz400 and mine might be different from yours. But on mine there are two hoses that you need to worry about. The big one is the main fuel line and it goes to the splitter between the carbs. The smaller one is the vacume line and it runs from a intake at the top of one of the carbs to the smaller tap on the back of the petcock. I found out the hard way that if you run it to anywhere on the bottom it runs like crap. It reached down to the bottom and it fit to an outlet valve but definetly was not supposed to go there.

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Re: 78 kz400 b1 fuel and vacuum lines ???

20 Apr 2011 22:49
#445952
Sounds like we have the same carbs. Yep i figured it out. I kept wondering What that other black spout in the top corner went to...its so hidden. Thanks! Also any advice or comments on single vs dual carbs!?
78 kz750 twin
77 yz125
91 cr250
99 dr650

ex's:
78 kz400 b1
89 yz80
99 klx300

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