SOHC.co.uk Forums > CB350/400

Carb rebuild

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Matt_Harrington:
Well done Tim. Do I take it that the ol' bike is now running well?

Nurse Julie:
Great video Tim. I admire your restraint, I'm usually kicking things and swearing like a trooper with issues like that. You certainly had a mish mash of brass ware fitted that's for sure. Well done.

McCabe-Thiele (Ted):
I have a decent set of four original  emulsion tubes - PM me if you are interested (not asking daft money).
I replaced mine together with the floats for no good reason when I refurbished the carbs in 2020.

Out of interest on your electronic ignition can you check the timing for 1-4 & 2-3 as I see no sensors that are adjustable for each pair of cylinders?

Multiman:
Thanks for the comments guys.

I should be able to make a quick video as I work in TV for a living.
My defence for the slightly weird captions etc is I haven't done any actual editing in decades, I mainly look after the colour correction side of things. My offspring say I do the colouring in.
I just had a quick go on iMovie as thats what I've got and it is a crap bit of software.
I'm going to teach myself another program called Resolve.
Once I've got my head round that, look out for the Directors Cut, it will be a belter.

I made a selection of the emulsion tubes that all looked the same and had same position shoulders etc when checked with a vernier.
Only one had the drilling off centre and it was really easy to spot if a shocking bit of QC.

The electronic ignition has no built in advance curve like some other more impressive systems eg Tri Spark but the bike still has the centrifugal mechanical unit advancing the aluminium rotor that contains the magnets that trigger the signal. I checked it was advancing with the strobe and all good.

There is no separate adjustment for 1-4 vs 2-3 on the EI system, they are simply built with the transducers at 180° to each other. Not sure if this is a disadvantage?

Julie I have wanted to kick the thing more than once but I always do my ranting off camera. Think Basil Faulty birching his car...

Is it going well now?
So off I went in the sunshine, pottered round the estate to the main road, got onto a straight and applied considerable beanage.
Lush.
However she didn't want to slow down, throttle was jammed open sort of.
By the top of the hill it was sorted so maybe just settling in?
Then next straight the same.
Traffic lights fumbling with crazy reving thing between my legs and driver up my arse.
Not happy.
To cut a long story short, I managed to get the revs to drop and slowly made it home whilst trying to think of what I hadn't done right?
Throttle cable anchor not tightened perhaps, didn't feel like fueling but some carb mechanical thing.

Took the tank off at home.
Throttle cables all good.
Then it became obvious.
Some dickhead hadn't tightened the throttle stop pin which was free to rotate and jam the butterfly partially open. Randomly.
At least it was an easy, if embarrassing, fix.
Note to self.
Never think its sorted till you do a road test, blipping the throttle in the garage hadn't shown it.

Then I went a did a very enjoyable 35miles and came back grinning like a Cheshire Cat.
Everything works and there will obviously be a few tweaks, but the engine is running really well.

Roo is threatening to come over sometime and I'll get him to take it out for a second opinion.

Ted thanks for the offer of emulsion tubes, but as the engine is going well I think you should hang on to them. Cheers mate.

Its been said more than once own here that the old brass works better and I think I proved this too myself.
But it raises the question of what is right and what is wrong.
How do you know if you buy a carb service kit that the parts are right?
Are there and drawings available for the parts? I guess not, but it would be really useful to have some basic dimensions of components to be able to check.
Thoughts?

K2-K6:

"There is no separate adjustment for 1-4 vs 2-3 on the EI system, they are simply built with the transducers at 180° to each other. Not sure if this is a disadvantage?"

No disadvantage at all, in my view. The original points are separately adjustable to remove production tolerance in their own manufacturing process, so to take care of any potential error they built in. Also, their rubbing block/heel wear that may also change this aspect.

Electronic triggered by the same singular spindle, as long as it's accurately assembled in regard to pickup point, shouldn't have variance or reason/need to adjust.

Looks fine in video clip.

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