Author Topic: Carb help please!  (Read 567 times)

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Offline 75 super sport

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Carb help please!
« on: March 05, 2012, 12:38:02 PM »
I am in the midst of rebuilding my carburetors on my 1975 cb750f. I just bought these on ebay and have no clue where they are at as far as adjustments.Just wondering how to install and adjust the choke valves? One fell out and i have no idea on how to install them. Also, how do i make sure the carburetor is adjusted correctly, as far as gas fuel/air mixture etc... My slide seems to be sticking at the top when the throttle is wide open. Thanks in advance for the help guys.
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Online CycleRanger

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Re: Carb help please!
« Reply #1 on: March 05, 2012, 12:57:46 PM »
Grab a copy of the Shop Manual here: http://honda4fun.com/materiale-documentazione-tecnica/shop-manual
The 750 one includes the supplements for your bike.

Also get the Parts List here: http://honda4fun.com/materiale-documentazione-tecnica/parts-list/parts-list-cb750

It will show you how the carbs go together.
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline harisuluv

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Re: Carb help please!
« Reply #2 on: March 05, 2012, 01:43:06 PM »
If you need help you can give me a call. My number is in my sig in my carb rebuild thread.  For free of course, don't mind helping others.

Offline 75 super sport

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Re: Carb help please!
« Reply #3 on: March 05, 2012, 02:10:24 PM »
Thanks alot harisuluv! I just put my first carburetor into the parts dip bucket. I did not mess with the choke, i just disconnected the carbs at the 'turnbuckle'. My slides seem to stick at the top, is it ok to sand them down a little with steel wool or fine sandpaper? Thanks again!
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Offline Duke McDukiedook

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Re: Carb help please!
« Reply #4 on: March 05, 2012, 03:06:04 PM »
Rule 1 of rebuilding carbs- do NOT derack the carbs unless you absolutely, positively, there is no other way to possibly do it other than dreacking.
Most carbs can be completely rebuilt without taking them off the rack.

Rule 2- take pictures since digital pics are cheap and can be viewed on your computer to confirm proper reassembly.

Rule 3- use generous amounts of carb cleeaner AND compressed air to blow out orifices and nooks/crannies/air passages.
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CB750 K3 crat | (2) 1986 VFR750F

Offline harisuluv

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Re: Carb help please!
« Reply #5 on: March 05, 2012, 06:01:59 PM »
You can do that but I don't really try to take off metal until I soda blast the cylinders and buff the slides so I know exactly where I'm at. Also if you have the caps off sometimes it seems like it might catch a bit at the top when coming back down because it might catch a bit on the rail. It's a pretty precise fit. If I need to do some sanding I will mark the slide with a sharpie marker and then slide it up and down again so the marks will reflect exactly where the imperfections are. Then you can isolate and deal with just the spots you need to. Hope that helps.