Vaccum Line question

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29 Mar 2006 14:47 #35258 by AzKZ650
Vaccum Line question was created by AzKZ650
Hi Folks,

I'm really new at working on motorcycles and I could use some help with my carbs vaccum ports. I have a 1978 KZ650 SR, and I have to open ports here:

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29 Mar 2006 14:48 #35259 by AzKZ650
Replied by AzKZ650 on topic Vaccum Line question
Damn, mixed that up. that would be 4 open ports in first pic and 2 in this pic.



Should I have lines running to them or block them off ?

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29 Mar 2006 14:49 #35260 by btchalice
Replied by btchalice on topic Vaccum Line question
those are overflow tubes you need 4 short hoses to drain below the bike in the event of an overflow so gas doesnt land on a potentially hot engine

oops posted on the first pic

the two in the second usually tee into the vaccuum valve on a petcock not sure on your bike though

Post edited by: btchalice, at: 2006/03/29 17:52

Terry Meyer / Wichita KS
76 kz900 w/1000 motor TWZTD
I am not driving too fast, I'm flying too low.

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29 Mar 2006 14:51 #35262 by AzKZ650
Replied by AzKZ650 on topic Vaccum Line question
Sorry about the supe-sized pic, thought I had reduced it.

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29 Mar 2006 22:07 #35360 by AzKZ650
Replied by AzKZ650 on topic Vaccum Line question
Hi btchalice,

Do you think I should try and re-run some lines to connect the top two with the petcock, or just cap them since the bike runs as is ?

Thanks,
-Brian

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30 Mar 2006 03:47 #35384 by NOS
Replied by NOS on topic Vaccum Line question
As far as I know only one line runs the vac on the petcock. I may be wrong on this, but the two lines could be for the "clean air" system. Seems like you could cap them off and see if everything works OK. If they were vac lines, the petcock wouldn't work at all when set "on" or "res", (if the petcock was working properly :unsure: )it would only flow without vaccum on "prime". (at least on my bikes)
To determine if you have a vaccum petcock you need to look at its settings. On vaccum models there are "on","Res", and "Prime". Non-Vac Petcocks, I believe, have "On", "Res, and "off".
Check to see what petcock you have and that should determine what the lines are for.

BTW, could you post a supersize pic of the 2 lines (my eyes aren't as good as they used to be ;) )

Post edited by: NOS, at: 2006/03/30 06:49

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30 Mar 2006 06:47 #35415 by wiredgeorge
Replied by wiredgeorge on topic Vaccum Line question
This link contains info on connecting your carburetors:

www.wgcarbs.com/88724.html

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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30 Mar 2006 10:48 #35453 by AzKZ650
Replied by AzKZ650 on topic Vaccum Line question
Thanks wiredgeorge, that page is Great !!! and NOS thanks for explaining the different petcocks, mine is a vaccum operated one.

Thank You,
-Brian

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