SOHC.co.uk Forums > CB350/400
Cable routing plus starting issues
Ken4004:
Hi everybody
Could you please assist me with the correct routing of cables around the steering area so specifically throttle, clutch , brake lines , Speedo and rev counter with photos if possible.
I want to avoid finding out there routed incorrectly and damaging the cables.
I also had fun and games this weekend starting up the bike for the first time since total rebuild, filled the carbs and fuel leaked out of one of the throttle bodies all over the floor not a good start do carbs off again and checked the float valves which seemed OK throttles back on with same result d as o have bitten the bulletin and bought a DS carb repair kit .
Anyway manage to get the bike to fire once and that was it no more action so checked all the obvious timing, spark, points re adjusted , compression checked again and all looks good so tried again still no joy.
A little bit of head scratching and thought maybe the exhaust is blocked with rust/carbon so I remove the silencer and tried to start again and the bike started without hesitation on three cylinders due to the leaking carb, so lesson learned there.
Didn’t realise that you cannot see straight through the silencer due to the baffle in the silencer so several taps with a rubber mallet and all the carbon/rust came out so continuously tapping and blowing through with an air line both ways then tried flushing out with a jet washer at low pressure then dried it all with a hot air gun and the exhaust seems to be clear now.
Has anyone had a similar problem with a block of exhaust ?
Just waiting for the carb kit now and will see if the bike will start on all four cylinders and then on to the next stage carb balancing probably another learning curve but I am enjoying the challenge.
Cheers in advance Ken4004
exvalvesetdabbler:
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.
Ken4004:
Ok thanks ,your right I cannot open the link
exvalvesetdabbler:
--- Quote from: Ken4004 on September 10, 2025, 04:15:28 PM ---Hi everybody
Could you please assist me with the correct routing of cables around the steering area so specifically throttle, clutch , brake lines , Speedo and rev counter with photos if possible.
I want to avoid finding out there routed incorrectly and damaging the cables.
I also had fun and games this weekend starting up the bike for the first time since total rebuild, filled the carbs and fuel leaked out of one of the throttle bodies all over the floor not a good start do carbs off again and checked the float valves which seemed OK throttles back on with same result d as o have bitten the bulletin and bought a DS carb repair kit .
Anyway manage to get the bike to fire once and that was it no more action so checked all the obvious timing, spark, points re adjusted , compression checked again and all looks good so tried again still no joy.
A little bit of head scratching and thought maybe the exhaust is blocked with rust/carbon so I remove the silencer and tried to start again and the bike started without hesitation on three cylinders due to the leaking carb, so lesson learned there.
Didn’t realise that you cannot see straight through the silencer due to the baffle in the silencer so several taps with a rubber mallet and all the carbon/rust came out so continuously tapping and blowing through with an air line both ways then tried flushing out with a jet washer at low pressure then dried it all with a hot air gun and the exhaust seems to be clear now.
Has anyone had a similar problem with a block of exhaust ?
Just waiting for the carb kit now and will see if the bike will start on all four cylinders and then on to the next stage carb balancing probably another learning curve but I am enjoying the challenge.
Cheers in advance Ken4004
--- End quote ---
Should run fine without the silencer, your neighbors might not like it though....
Just pull off one of the plug caps and fit a spare/old plug in the cap , rest it on the engine and see if it sparks.
If a float valve is stuck open, a gentle tap on the offending carb bowl with a screwdriver handle might seat it. In any case if you turn off the fuel tap once it leaks, the bike should run for a few minutes on what's in the bowls. Also with a cold start, throttle fully closed and choke fully on.
Regarding the exhaust, I had one that rotted from the inside, it just got rather loud.
Regards Dave
Regards
Dave
Ken4004:
Hi Dave thanks I tried all the normal hacks to stop the bowl leaking hence ordering the new kit, I ordered the full kit because it was only two pounds more than just ordering anew valve so will keep the rest of the parts as spares.
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