Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: yorky10 on April 15, 2013, 09:14:14 PM
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can any of you fellow members give me a clue as to why my 400four will only run on full choke,carbs have been ultrasonic cleaned,yorky10
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Yorky,
Defiantly lack of fuel.In my experience do not rely on ultra cleaning stuff.Had my 750 ones done still ran like crap.Bought a can of carb cleaner and squirted down every hole I could find then high pressure air loads of tiny bits emerged.Also check the main tube what the needle goes up and down in.On the air screw make sure the hole at the bottom is clear too.Then float heights critical.
Hope this gives you help.
Cheers
Bitsa
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Had similar issues on my 400/4 recently when carbs cleaned (manually). However hadn't given enough attention to air pilot jets. - carb cleaner / air line sorted it.
PS where are you in Derbyshire?
Tim
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hi tim I live southnormanton.not far from alfreton,cheers for info I will try anything,yorky
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Spooky - guess where I live. Broadmeadows / sth. Normanton.
Small world etc.!
Tim
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hi ,tim,its a small world did you get yours sorted,ive tried every thing,i agree its a fuel problem,i am sick of keep taking carb s apart.yorkygrayfallow.
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Yorky.
Know what you mean did mine several times but when you sort it the silly grin appears.Keep going and good luck.
Cheers
Bitsa
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Agree with bitsa. Try, try and try again!
Have you looked at air screw jet. Everything else is pretty accessible to clean I would look there again if I were you.
TIm
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hello all,may have sorted carbs ,filled them up with carbcleaner and got air line on them again,bloody starter solenoid packed up now,think I will give it a rest ,for a few days while I order one.tim I havechecked air screws jets are new orings are new,still enjoying it but bloody annoying.yorky
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fired bike up to day,just same run on choke,not with out,,any one sell me set of carbs,at reasonable price,or even loan me me same .yorky
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yorky if you find you need any carb parts let me know i have loads of them new and old plus as tim will tell you i,m not far away from you
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The other possibility for running weak is too much air.
Are your carbs seated well on their rubbers and the rubbers to the head?
(had a similar issue on my son's old CB125 recently)
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Yorky,
As you are just round the corner you can borrow my set if you are really desperate!! The only set I have are on my bike and as you know, they are a pig to get on and off!
Tim
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thanks,for offer Tim but I could not put anyone through taking them off for that,i thought if I could fit a good set and it ran better.well today,i start rebuilding them again,fingers crossed,again thanks for offer,if you or any one as some for sale im your man
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I'll listen out for the swearing then!!
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can any one tell me where I can get a good exploded picture of fourhundred 4 carbs.please.my book picture,haynes and the American one are oiled up .sad is not.if its not running after this its for sale.yorky.
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Try the CMSL site as they have exploded diagrams of everything. I have been where you are, frustrated with a bike that won't play ball, but keep trying and with help from this forum you will get there! Is there any members nearby who could take a look, two heads are better than one! Also everything else has to be spot on, valve/ignition plugs etc. Good luck!! Mick
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http://images.cmsnl.com/img/partslists/honda-cb400f2-england-engine-group-1j-1k-2j-2k_bigma000081e01-4_3e89.gif
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Only running when on choke definitely sounds like blocked jets. I also had carb issues (bike wouldn't rev past 6000). I know this will be frowned upon by some people but as well as using carb cleaner I ran a thin wire through the emulsion tubes with them out the carbs - down the length of them and through the holes drilled across them. If you use a soft wire, copper for example, rather than something coarse like untwisted brake cable there shouldn't be a problem. It worked for me...
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Did you remove the emulsion tubes to clean them?
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Yes, and the jets. They just unscrew and you can put a good squirt of carb cleaner into the internal drillings of the carbs while they are out.
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Hi Yorky, have you seen the document that Tim Boughen has produced? It's basically a complete run through of the process of disassembling, cleaning and replacing 400/4 carbs. It's mainly done with pictures and I can honesty say I wouldn't have had the confidence to tear my carbs apart if I hadn't seen it first. I really is that good! See link below.
http://www.docstoc.com/docs/97200467/CARB-REBUILD-101
All the best and god luck.
Kenny
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Old thread, I know... I've seen many references to Mr. Boughen's document, but it seems to have disappeared from the net. Does anyone have a source? Or, does anyone have a copy available?
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Old thread, I know... I've seen many references to Mr. Boughen's document, but it seems to have disappeared from the net. Does anyone have a source? Or, does anyone have a copy available?
I have it but it's too large to attach.
Pm me your email address and I will send it to you. :)
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Old thread, I know... I've seen many references to Mr. Boughen's document, but it seems to have disappeared from the net. Does anyone have a source? Or, does anyone have a copy available?
I have it but it's too large to attach.
Pm me your email address and I will send it to you. :)
PM sent, thanks!
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Old thread, I know... I've seen many references to Mr. Boughen's document, but it seems to have disappeared from the net. Does anyone have a source? Or, does anyone have a copy available?
I have it but it's too large to attach.
Pm me your email address and I will send it to you. :)
PM sent, thanks!
Done
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Done Andy
Anyone else ;D
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Perfect.. many thanks :)
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Old thread, I know... I've seen many references to Mr. Boughen's document, but it seems to have disappeared from the net. Does anyone have a source? Or, does anyone have a copy available?
I have it but it's too large to attach.
Pm me your email address and I will send it to you. :)
The US sohc forum has larger size limits, I was able to post it there...
http://forums.sohc4.net/index.php/topic,152810.msg2045081.html#msg2045081 (http://forums.sohc4.net/index.php/topic,152810.msg2045081.html#msg2045081)