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Author Topic: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID  (Read 5849 times)

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Offline mberning

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1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« on: October 11, 2012, 12:07:52 PM »
I am trying to figure out if the my Accelerator pump on my 1976 CB750A is hooked up properly.  When I pulled the tank I noticed that only two of the ports had vacuum hoses attached.  Is it possible I am missing a hose or is their suppose to be one port empty? 

From the microfiche it looks like one of the ports is not connected to anything.  Am I reading the microfiche wrong?

I also wanted to know if the part from 1977-1978 CB750A (36161-393-033) would work on a 1976 CB750A which calls for (part # 36161-393-013) ?
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Offline Dave B.

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #1 on: October 11, 2012, 07:57:28 PM »
I have just have gone through some carb. issues with my 1976 750 A  and I am sure there are more people out there that know more but I believe you are talking about the vacuum switch that is activated by the changing relay to move the vacuum slave that bumps up the RPM's so that the bike doesn't stall when you put it in gear.That hose on the bottom (on mine) hangs down and is open  Now the accelerator pump is physically located in the #2 carb. To get to that you have to disassemble the #2 carb. 
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New  owner of a 1976 CB 750 A .. bikes -1965 (?) 250 Harley, 1969 Honda CB 450(new).Yamaha XS650, Honda Helix, Kawasaki VN800, Kawasaki VN1500 and now a Vintage Hondamatic that needs TLC

Offline mberning

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #2 on: October 12, 2012, 08:39:55 AM »
No the part I am referring to part number 2 which located outside the carb.  See the photo on the microfiche pic attached

What vacuum hoses attach to the ports of part #2



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Offline Dave B.

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #3 on: October 12, 2012, 05:53:30 PM »
I viewed the micro fiche and I stand by my explanation. Take a good look at your bike with a printed copy of the fiche in hand and follow it about.Please read it again.
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New  owner of a 1976 CB 750 A .. bikes -1965 (?) 250 Harley, 1969 Honda CB 450(new).Yamaha XS650, Honda Helix, Kawasaki VN800, Kawasaki VN1500 and now a Vintage Hondamatic that needs TLC

Offline raymond10078

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #4 on: October 13, 2012, 12:50:54 PM »
I am also not sure what you are asking.

The problem seems to be that you are talking about an accelerator pump, but then you provide a figure that IS NOT anywhere related to the accelerator pump.

I think that this diagram from the Service Manual will help:
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline raymond10078

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #5 on: October 13, 2012, 12:58:46 PM »
The accelerator pump is part of carb number 2:

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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline raymond10078

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Difference between 76 and 77/78 throttle positioner solenoid's?
« Reply #6 on: October 13, 2012, 01:19:46 PM »
Can't answer your other question.

Does anybody else know the difference between a 76 and a 77/78 throttle positioner solenoid?
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline mberning

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #7 on: October 13, 2012, 08:35:02 PM »
I am referring to part number 36161-393-013/36161.  Which is simply called Valve, Solenoid on the CARBURETOR (SOLENOID VLV) Schematic on the micorfiche.  This is part #2 in that drawing.

There are 3 ports coming out of this part along with an electrical harness.  The microfiche shows only two rubber tubes/vacuum lines coming out of it and nothing coming out of the port 180 degrees opposite of the electrical connector.   


Please look at part # 2 in the attached drawing

My question is does any line/tube connect to the port which is on the opposite side of the electrical connector?
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Offline raymond10078

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #8 on: October 14, 2012, 06:16:50 AM »
If you looked the drawing I provided from the Service Manual, you would see that I did answer your question.

Please understand that the goal of a parts fiche is NOT to help you put the bike together.

Regardless, here is the fiche marked up to answer your question.

« Last Edit: October 14, 2012, 06:18:51 AM by kandrtech »
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline mberning

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Re: 1976 CB750A Automatic Carburetor Accelerator Pump Valve SOLENOID
« Reply #9 on: October 14, 2012, 09:52:07 AM »
Thanks,  I figured it out shortly after I sent my response

Found the picture on the Shop Manual page 13-8

The 3 ports go to


A) Throttle Opener
B) Carburetor
C) Air-Box
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