Is there any on the spare carbs you just picked up?
Chudman1
CB750 Enthusiast
Good thinking, I’ll check
That being said the ones that were on the 750 carbs had turned to mush, so I’m not sure they’ll be much use.
Anyhoo, here’s the carbs after the clean, I popped the bowls on to set the gasket in.
Didn’t have time to assemble the bank today but we’re getting there.
Come a long way since the beginning of this thread
Please ignore the mess that is my workbench
That being said the ones that were on the 750 carbs had turned to mush, so I’m not sure they’ll be much use.
Anyhoo, here’s the carbs after the clean, I popped the bowls on to set the gasket in.
Didn’t have time to assemble the bank today but we’re getting there.
Come a long way since the beginning of this thread
Please ignore the mess that is my workbench
Looking good. Even the Wiener Dog looks impressed.
Chudman1
CB750 Enthusiast
“Weiner”
We cause them Sausages in Aus mate
I also cleaned off the nasty black plasti dip off the tops too
This has been very time consuming, itching to get it finished so I can start the bastard
While you are there HAND polish vacuum piston sides, bore and cap (inside). This will really improve your throttle response.
For your missing rubber plugs go to Amazon like Brett said, they have variety pack of silicon plugs, I would test their resistance to the gas first before putting them in!!!
Chudman1
CB750 Enthusiast
I could be wrong, but I don’t think they’re adjustable on this model of carbs
Chudman1
CB750 Enthusiast
I gave them a light hit with some scotch bright to make sure they were moving freely
I’ll probably double back on them again though
I usually use Autosol on the inside of the bore and the slide. Cleans them up nice.
Chudman1
CB750 Enthusiast
Alright I’m back!
Just so happened the 900s carbs had usable slow speed jet plugs, so that’s a bonus.
I got the 750s carbs fully assembled today, they’re looking damn good too if you ask me.
I stole the rail off the 900 set too and cleaned it up.
Now, I know everyone is going to have the shits with me for this next part…
Rather than use the airbox, I got some bigger jets when I did the rebuild.
I swapped the slow speed jet for a 45.
The main for a 115 and the secondary main for a 75.
Now with all this in mind, see the video.
Just so happened the 900s carbs had usable slow speed jet plugs, so that’s a bonus.
I got the 750s carbs fully assembled today, they’re looking damn good too if you ask me.
I stole the rail off the 900 set too and cleaned it up.
Now, I know everyone is going to have the shits with me for this next part…
Rather than use the airbox, I got some bigger jets when I did the rebuild.
I swapped the slow speed jet for a 45.
The main for a 115 and the secondary main for a 75.
Now with all this in mind, see the video.
Attachments
If it runs with that set up, that's great! Pods have a particular issue with these carbs, and that is blocking the air circuit at the face of the carb body. Make sure that is open. Once you get the bike running, start checking the plugs for a lean condition so you don't melt valves, etc.
When your carbs' circuits are unblocked, and you find the right jets, refer to the plugs for confirmation it has the correct fuel/air mix and you're set to ride!
When your carbs' circuits are unblocked, and you find the right jets, refer to the plugs for confirmation it has the correct fuel/air mix and you're set to ride!
Chudman1
CB750 Enthusiast
Hey Brett, I did check and they don’t block the air circuit
However I got the bike running a few times but even with the throttle fully open and the choke closed it was completely bogged?
All the pipes were hot which is a good sign
Also there’s a decently loud knocking
Not sure if you can hear it in the video
However I got the bike running a few times but even with the throttle fully open and the choke closed it was completely bogged?
All the pipes were hot which is a good sign
Also there’s a decently loud knocking
Not sure if you can hear it in the video
Those pleats in that style of pods causes turbulence in the air entering the carbs. Changing jets WILL NOT solve that problem. Your slides will not work smoothly with that air turbulence. Long FOAM filters will not have that turbulence.
Did you put new throttle cables and a choke cable on it or are you still trying to take shortcuts? Put the airbox on. Get the hose clamps off it and put the proper clamps on. Why do I get the feeling we are all wasting our time with you?
Chudman1
CB750 Enthusiast
If I was still taking shortcuts would I have spent 20hrs rebuilding the carbs?
The goal was to see if the bike would start, which it did.
The clamps and new throttle cables etc are on the list of things to get
The goal was to see if the bike would start, which it did.
The clamps and new throttle cables etc are on the list of things to get
You very likely have vacuum leaks because of those clamps, but we already told you that. Put a choke cable on it, put the airbox on it and get it to run. Running for a few seconds isn't a victory.
Motogrady
Motogrady
Pods.
I’ve seen guys tape off 2/3 of the pods filter area to get them to work.
Clean the jets till yer blue in the face.
Unless you get the gunk/varnish/crap out of the very small passages that from the idle screw you are wasting your time.
A guitar string to act as a snake, acetone squirted thru a small tube from a squirt bottle, along with 100 psi, not 40, not 50, to
blast that crap out is recommended.
If the fuel does not squirt into the throttle body from the idle aircrew hole you do not have it clean.
The dohc bike loves a well charged, fresh battery.
If it doesn’t start within 4 seconds, after 3 or 4 times, there is a reason.
No need to fry the starter.
Put the air box on.
Leave the filter out.
Spray starting fluid in the box for about 4 seconds.
If it lights up, it ain’t the carbs.
I’ve seen guys tape off 2/3 of the pods filter area to get them to work.
Clean the jets till yer blue in the face.
Unless you get the gunk/varnish/crap out of the very small passages that from the idle screw you are wasting your time.
A guitar string to act as a snake, acetone squirted thru a small tube from a squirt bottle, along with 100 psi, not 40, not 50, to
blast that crap out is recommended.
If the fuel does not squirt into the throttle body from the idle aircrew hole you do not have it clean.
The dohc bike loves a well charged, fresh battery.
If it doesn’t start within 4 seconds, after 3 or 4 times, there is a reason.
No need to fry the starter.
Put the air box on.
Leave the filter out.
Spray starting fluid in the box for about 4 seconds.
If it lights up, it ain’t the carbs.
