SOHC.co.uk Forums > CB350/400
Cable routing plus starting issues
SteveD CB500K0:
--- Quote from: exvalvesetdabbler on September 10, 2025, 06:59:25 PM ---this might help
https://info.sohc.co.uk/download/cb400f-dealer-setup-manual/
Link broken - might need to give the mods a nudge to fix it.
--- End quote ---
Here's the one from Ash's Dropbox:
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exvalvesetdabbler:
Carb balancing,
Its easier to do a static balance if they are off the bike and I have never improved on that using gauges. I see them as a convenience/diagnostic tool to save dismantling carbs at a later date.
Get 4 small ball bearings from a bicycle wheel.
Lay the carbs on the bench at an 45 degree angle with the inlets facing upwards.
Drop a ball bearing in each inlet and wind open the throttles with the idle adjuster. Which ever ball bearing drops through first, adjust that carb. Keep going until they all drop through within < 1/8 of a turn of the screw.
If the vacuum gages later show an imbalance look for an induction air leak somewhere.
Even if they are way out the bike should still run and rev, it will just sound like a bucket of bolts at tickover.
Float valves stuck. Don't rule out a bent float pivot that gets stuck if it sinks all the way to the bottom. I managed to bend one of mine through freeing them off after they were gummed up with varnish after a lay up. Swapped it out for a spare - problem solved.
Regards Dave
Ken4004:
Hi Dave
I did bench set the carbs using the end of an 1/8 inch drill bit , a method suggested on utube but your method sounds like a better option.
When I bench synced the carbs I did check that the floats were free to more when I was checking the float height but they may be a bit tricky so will check again.
A few years ago I had all four of my z1000 leaking just after I filled up with super market fuel which was contaminated with water, only got half a Mike from the garage when fuel started pouring all over the engine a scary moment with a hot engine.
I stripped down the carbs and they were completely gunned up where the ethernol reacted with the water.
So after half a can of carb cleaner reassembled the carbs and back to normal, last time I put super market fuel in my bike.
I did see a utube video where the guys used only one gauge and 4 shut off valves because he said the gauges on a 4 gauge balancing tool were not accurate to each other so I’ll try both methods.
Ken4004:
Thanks for the link Steve manual down loaded
Bryanj:
Yamaha used to supply one gauge with a rotary valve and it was a bear to use as adjusting 1 carb tends to alter the others.
A DECENT set of 4 like sealey sell is the best, these sets on a blue thin steel backing with plastic valves in the lines are not very good.
The sealey ones aint cheap but are nearest to original Honda i have seen
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