Author Topic: 400four choke  (Read 7324 times)

Offline yorky10

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400four choke
« on: April 15, 2013, 09:14:14 PM »
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
hi im a pensioner from Derbyshire,been into bikes since of age of 10 ish never been with out one.at present doing a 1976 400four from bin bags and boxes.getting there slowly.yorky10

Offline Bitsa (Ralph Wright - RIP)

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Re: 400four choke
« Reply #1 on: April 16, 2013, 09:22:54 AM »
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
Long Live Best Bitter.Status Quo and Sohc Bikes and common sense which you can not teach

Offline Rozabikes Tim

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Re: 400four choke
« Reply #2 on: April 16, 2013, 01:03:04 PM »
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
One day I'll have the time to restore it, not just talk and dream....

Offline yorky10

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Re: 400four choke
« Reply #3 on: April 16, 2013, 06:45:59 PM »
hi tim I live southnormanton.not far from alfreton,cheers for info I will try anything,yorky
hi im a pensioner from Derbyshire,been into bikes since of age of 10 ish never been with out one.at present doing a 1976 400four from bin bags and boxes.getting there slowly.yorky10

Offline Rozabikes Tim

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Re: 400four choke
« Reply #4 on: April 16, 2013, 07:47:30 PM »
Spooky - guess where I live. Broadmeadows / sth. Normanton.

Small world etc.!

Tim
One day I'll have the time to restore it, not just talk and dream....

Offline yorky10

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Re: 400four choke
« Reply #5 on: April 21, 2013, 11:19:04 AM »
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.
hi im a pensioner from Derbyshire,been into bikes since of age of 10 ish never been with out one.at present doing a 1976 400four from bin bags and boxes.getting there slowly.yorky10

Offline Bitsa (Ralph Wright - RIP)

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Re: 400four choke
« Reply #6 on: April 21, 2013, 07:01:39 PM »
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
Long Live Best Bitter.Status Quo and Sohc Bikes and common sense which you can not teach

Offline Rozabikes Tim

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Re: 400four choke
« Reply #7 on: April 21, 2013, 08:33:22 PM »
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
One day I'll have the time to restore it, not just talk and dream....

Offline yorky10

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Re: 400four choke
« Reply #8 on: April 22, 2013, 07:33:48 PM »
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
hi im a pensioner from Derbyshire,been into bikes since of age of 10 ish never been with out one.at present doing a 1976 400four from bin bags and boxes.getting there slowly.yorky10

Offline yorky10

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Re: 400four choke
« Reply #9 on: May 01, 2013, 05:45:54 PM »
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
hi im a pensioner from Derbyshire,been into bikes since of age of 10 ish never been with out one.at present doing a 1976 400four from bin bags and boxes.getting there slowly.yorky10

Offline steven400/4

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Re: 400four choke
« Reply #10 on: May 01, 2013, 06:26:51 PM »
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
cb400f2 x7
honda ss 50
gsx 1400

Offline D-Rider

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Re: 400four choke
« Reply #11 on: May 02, 2013, 11:06:46 AM »
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)

Offline Rozabikes Tim

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Re: 400four choke
« Reply #12 on: May 02, 2013, 05:04:11 PM »
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
One day I'll have the time to restore it, not just talk and dream....

Offline yorky10

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Re: 400four choke
« Reply #13 on: May 04, 2013, 08:23:59 AM »
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
hi im a pensioner from Derbyshire,been into bikes since of age of 10 ish never been with out one.at present doing a 1976 400four from bin bags and boxes.getting there slowly.yorky10

Offline Rozabikes Tim

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Re: 400four choke
« Reply #14 on: May 04, 2013, 12:23:33 PM »
I'll listen out for the swearing then!!
One day I'll have the time to restore it, not just talk and dream....

 

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