SOHC.co.uk Forums > CB350/400
Carb rebuild
Multiman:
Teds switch assembly has arrived and the interior is completely unmolested.
This so useful as it shows all the original cable/insulation layout which will enable me to fix mine and get it to go back together properly.
Cheers Ted, a legend.
McCabe-Thiele (Ted):
--- Quote from: Multiman on January 05, 2023, 01:04:15 PM ---Teds switch assembly has arrived and the interior is completely unmolested.
This so useful as it shows all the original cable/insulation layout which will enable me to fix mine and get it to go back together properly.
Cheers Ted, a legend.
--- End quote ---
The switch came with a bunch of parts when I bought my spare carbs & engine from a member here "Pops400" he was going to rebuild his fathers old 400 but the frame was badly damaged, the bike was sold off for spares shortly after his father & brother had died. He is a really nice bloke who had a small lock-up unit near his home where he stored his main passion - 1950/60s American Cars.
Multiman:
The story so far....
Bought my 400/4 last may whilst I was learning to ride.
Got 2 mates to ride who gave it the thumbs up and it sounded and ran sweet.
Didn't take my A lic till November but passed at the tender age of 65.
Took the bike out for a run and it was awful.
Carbs flooded and the bike was jerky and stalled at junctions.
Roo came and helped me whip the carbs off, took them away to strip, clean and generally fettle. What a gent.
Got the carbs back a refitted.
To cut a long story short it was still not running well, flooded on fuel on, revs hanging etc etc
I started fettling other aspects of the bike and trying other obvious things that might affect the bad running.
Eventually I had the carbs off again and found discrepancies with the float bowl needle valve seats.
Replacing them cured the flooding.
But the rev hanging still persisted.
So carbs off again and a full strip.
More discrepancies in the main jet and emulsion tubes, so sourced some old brass and fitted.
I've made a short video which documents the main issues
Let em know what you think
Cheers
Tim
McCabe-Thiele (Ted):
Enjoyed the movie never seen so much fuel leaking from carbs before. Hope it's sorted for good now.
I might just have been lucky with my 400 carbs - only time they have ever leaked is when I ran out of fuel on a journey - I came to a stop - switched on the reserve and petrol poured out of one carb in particular - I just shook the bike from side to side & it stopped pretty much instantly. I suspect the float /valve had stuck down due to the acute angle.
Oddjob:
Impressive film making skills, really liked that, didn't spot any Ewoks though, maybe get Roo in the film, he looks like one of those bar aliens in Star Wars, you can mutter at him "These are not the Yorkshiremen you're looking for, Oh and by the way it's your round"
Not 100% sure you got the ignition timing right, I seem to recall someone saying they need to be timed at full advance as they don't have an advance unit? Could be wrong, never fitted an electronic setup to a SOHC before. Someone will advise if I'm wrong.
Some stuff I spotted. Emulsion tube was drilled off centre, if that's the state of the others I'd have changed them all not just No3. Clearly someone has replaced the entire set of brass and it's poor quality brass at that. Remove the throttle cables and see if the hanging carries on, blip the throttle with the butterfly.
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