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Author Topic: CB 750k  (Read 1164 times)

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Offline old-drone1

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CB 750k
« on: November 05, 2012, 01:13:51 PM »
Hi, I am new to this Forum , i need some help,I just gat this nice CB 750 k but it had no Carburators, i found and rebuilt a set of Carb but here is where i go stuck. I need a Diagram of the Vacum Lines from the Carbs to ? . Can You help ?
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Offline flybox1

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Re: CB 750k
« Reply #1 on: November 05, 2012, 02:14:35 PM »
get yourself a copy of a CLYMER book for the 750's and download the shop manual from the forum...
Its all in there.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline 70CB750

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Re: CB 750k
« Reply #2 on: November 05, 2012, 02:57:16 PM »
+1 to get manuals.

But what vacuum lines?
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Prokop
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Offline cookindaddy

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Re: CB 750k
« Reply #3 on: November 05, 2012, 03:16:59 PM »
What year CB750K?

The 77 and 78 had vacuum lines as part of the primitive emissions control system. I don't think that the earlier ones did. The routing of the houses is detailed in the manual as someone pointed out. You will need an original air box from one of those years with the spigot on the top for one of the hoses.

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George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

Offline 750K

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Re: CB 750k
« Reply #4 on: November 06, 2012, 07:18:54 AM »
77-78's don't have vacume lines that hook up too the carbs, they do have crankcase vent lines and cam tower breather lines that meet at a junction and then vent back into the top of the airbox. Some of the pd carbs depending on year have a vent tube but they don't hook up to anything, they vent into the atmosphere.
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77 Cb750, 78 Kz1000

Offline Tugboat

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Re: CB 750k
« Reply #5 on: November 06, 2012, 09:41:22 AM »
^+1. There are no vacuum lines on any of the carbs on the K or F bikes.
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Offline cookindaddy

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Re: CB 750k
« Reply #6 on: November 06, 2012, 01:36:37 PM »
 Not to the carb but to the air box. Here is the pic from Honda on the hookup for the 77/78
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George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

bollingball

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Re: CB 750k
« Reply #7 on: November 06, 2012, 01:54:30 PM »
old-drone1
Wellcome to the madness. I think you can tell by now what we need to know the most is what year your 750 motor is. The carbs changed a lot over the years. The bigest change being in 77-78. If you look on the side of the carb you will find a number embossed on the body that is what we need. Again tell us the year of the (motor) not the frame.

Ken
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