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1975 CB 400 Four - Restoration
Oddjob:
Odd as most of the other sohc fours came with the plain washer, still not exactly hard to add one and will save your paint.
kiki.o:
Hi all,
Some more work has been done.
I have started with the carburettor assembly.
New jets, same size as the original
Float mounted and set at 21mm
New screws and fuel lines
Before and after cleanup
Choke
Cleaned before assembly
Oiled felt washer
Replaced rubber seals on fuel lines
1 and 2 are finished, need to finish up the 3 and 4 when I receive the replacement part from Canada
In the meantime, the coils and spark plug cables are mounted
That's it for the electrics part for now... Only horn left, and it's in the mail from Germany. Now with headlamp mounted.
That's it for now. I have tried to bleed out the front braking system, but with no luck. I have new braided lines, a new master cylinder and a new caliper.
I assume that the problem is in the MC, since there is no air bleeding out on the caliper nipple, clear fluid is bleeding out, but I cannot get the brake to build up a pressure. It does stop the front wheel when I spin it by hand, but with maybe a 1/10th of the force that it should be.
I assume that the rubber parts are old and therefore no way to build up on the pressure. While pumping the MC the black dirt was coming out of these two holes from the MC tank, as you can see in the picture, what's why I think that the blame is on the MC.
Did anyone have similar problem ? The MC is purchased from the CMSNL, but it's a repro.
Thanks for any input.
PS:Oddjob, you're right, the plain washer will be put between the spring washer and the paintjob. It's just a few minutes work.
Oddjob:
There should be a spring washer under the head of the float bowl screws as well, I always fit a flat one as well or it digs into the soft alloy and marks it.
I always wonder why 400 owners don't try and get rid of that awful choke mechanism, see if the 500/550 one will fit and ditch that awful linkage.
Johnwebley:
--- Quote from: kiki.o on January 16, 2022, 05:39:08 PM ---Hi all,
Some more work has been done.
I have started with the carburettor assembly.
New jets, same size as the original
Float mounted and set at 21mm
New screws and fuel lines
Before and after cleanup
Choke
Cleaned before assembly
Oiled felt washer
Replaced rubber seals on fuel lines
1 and 2 are finished, need to finish up the 3 and 4 when I receive the replacement part from Canada
In the meantime, the coils and spark plug cables are mounted
That's it for the electrics part for now... Only horn left, and it's in the mail from Germany. Now with headlamp mounted.
That's it for now. I have tried to bleed out the front braking system, but with no luck. I have new braided lines, a new master cylinder and a new caliper.
I assume that the problem is in the MC, since there is no air bleeding out on the caliper nipple, clear fluid is bleeding out, but I cannot get the brake to build up a pressure. It does stop the front wheel when I spin it by hand, but with maybe a 1/10th of the force that it should be.
I assume that the rubber parts are old and therefore no way to build up on the pressure. While pumping the MC the black dirt was coming out of these two holes from the MC tank, as you can see in the picture, what's why I think that the blame is on the MC.
Did anyone have similar problem ? The MC is purchased from the CMSNL, but it's a repro.
Thanks for any input.
PS:Oddjob, you're right, the plain washer will be put between the spring washer and the paintjob. It's just a few minutes work.
--- End quote ---
You could try a back bleed,
Take the caliper off the mounting bracket, remove the piston, fill the caliper with fluid, refit piston,
Carefully press in piston, monitor the fluid in the MC,
It should purge the air,
See if it helps
Sent from my SM-A750FN using Tapatalk
Bryanj:
Most dry master cyl need to be"bled" first.
1 WEAR NITRILE GLOVES
2 remove banjo bolt at master
3 put gloved finger over outlet hole
4 pull in lever
5 remove and replace finger
6 release lever
Repeat from 4 to 6 until you feel pressure pushing your finger off.
Whilst holding lever in remove fingerand reconnect pipe with banjo. It should now bleed normaly.
Forgot to add cover painwork and anything plastic in case fluid sprays
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