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wont run without choke

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mudcow007
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PostPosted: 19:21 - 24 Apr 2014    Post subject: wont run without choke Reply with quote

The saga continues....

some of you maybe aware of a "few" issues ive had with my wonderful Bandit (i use the term wonderful - very loosely)

todays issue seems to be idling off choke

i have just balanced the carbs using my trusty diy man-o-meter, but had to run the bike with the choke in halfway position

i have sprayed stuff all around the inlets an doesn't seem to be any air leaks...possible i have missed one though...maybe?

took plugs out after i had finished an they are as black as a witches hat with soot ?

i have a feeling the mixture is 2 turns out?

oh an float(s) seem to want to stay open too....what's it like to have a working bike?

oh forgot to say pilot jet etc are sparkly clean, would it matter that its got a Scorpion can on it too?
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Fizzer Thou
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PostPosted: 10:29 - 25 Apr 2014    Post subject: Reply with quote

It may well be best to remove the carbs and check the inlet manifold rubbers visually.It does sound as though there is an air leak causing you to have to richen up the mixture using the choke.

Are the inlet rubber clamps all tight?

Did you use WD40 to spray around the inlets?
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mudcow007
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PostPosted: 12:35 - 25 Apr 2014    Post subject: Reply with quote

im going to take the carbs off again tonight to check the floats, so will check the inlets are tight etc too

i was spraying carb cleaner all over them an didnt get any pops or bangs (or singed eye brows) so guessed there wasnt any leaks, will have a proper look tonight though
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tyler_jrn
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Joined: 17 Oct 2013
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PostPosted: 20:16 - 26 Apr 2014    Post subject: Reply with quote

mudcow007 wrote:
im going to take the carbs off again tonight to check the floats, so will check the inlets are tight etc too

i was spraying carb cleaner all over them an didnt get any pops or bangs (or singed eye brows) so guessed there wasnt any leaks, will have a proper look tonight though


will it rev up, ride just fine? is it only when its on idle?

id check like mentioned before, any massive air leaks, correct mixture etc. float, jets, filters are correctly fitted and of the correct sizes and settings. inspect the inlet housings and rubbers/boots for any cracks and spray around all the rubbers with wd-40 or carb cleaner and if possible rev the engine up and take the choke off (also try on full idle ) when doing so as this will create more pressure on the rubbers therefore making any air leaks more prominent.

I doubt the scorpion can would make any difference, i have one on my bandit 650 and have noticed no differences in starting it up.

make sure the carb is clean too if everything on the air intake checks ok. id make sure the full pilot circuit is spotless.

did it start fine before syncing the carbs?
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331X2
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PostPosted: 07:03 - 27 Apr 2014    Post subject: Reply with quote

Have you reset the idle speed after balancing the carbs?
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mudcow007
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PostPosted: 08:44 - 28 Apr 2014    Post subject: Reply with quote

alright

i haven't had a chance yet to attack my bike

im going to have a go today,

im struggling to adjust idle when its running, my hands are too big to get to the adjuster...
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mudcow007
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PostPosted: 15:34 - 28 Apr 2014    Post subject: Reply with quote

update

whipped carbs off again, an took the inlets off, 1 looked ok, but the other 3 looks like they had crusty white stuff on the block

https://i25.photobucket.com/albums/c81/mudcow007/20140428_160931_zps144c4f7a.jpg

https://i25.photobucket.com/albums/c81/mudcow007/20140428_160132_zpsdcb915b6.jpg

https://i25.photobucket.com/albums/c81/mudcow007/20140428_160142_zpsb9118494.jpg

https://i25.photobucket.com/albums/c81/mudcow007/20140428_160157_zpseb84df0a.jpg

do you reckon that could be causing issues?

the inlets themselves look to be solid with no cracks etc.

so, i will look to see if i can buy the rubber o-ring that goes between the block an the inlet

fingers crossed
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331X2
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PostPosted: 19:16 - 28 Apr 2014    Post subject: Reply with quote

It definitely won't be helping. I replaced the o-rings in mine because they were flat and didn't seem to squash up before the rubber tightened up to the head, measured them up and ordered from eBay, can't help you on size because mines the 400 with smaller carbs.

I'd be inclined to plug the ports and clean the faces up with oil and scotchbrite to give them a clean surface to mate up to.
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Bunny Lingus
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PostPosted: 04:31 - 29 Apr 2014    Post subject: Reply with quote

I had Nigella Lawson Syndrome on my slabside. I changed all the inlets but it turned out to be the carbs themselves. Is there loads of miles on the bike?
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Fizzer Thou
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PostPosted: 12:05 - 29 Apr 2014    Post subject: Reply with quote

Those 'O' rings are definitely causing the problem (I had not realised that the inlet manifolds were removeable).

I had the same problem on my CB125T2 and tried some blue Hylomar,which worked to some degree.But it was not until I replaced both that I could finally balance the carbs after adjusting the mixture screw.
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mudcow007
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PostPosted: 07:58 - 30 Apr 2014    Post subject: Reply with quote

Bunny Lingus wrote:
Is there loads of miles on the bike?


well the bike has 28k on the clocks but it came fitted with another set of carbs (it also came with the originals too) PO said the old carbs were jammed so he replaced them


Fizzer Thou wrote:
Those 'O' rings are definitely causing the problem (I had not realised that the inlet manifolds were removeable).


cool, will get the o-rings ordered today will keep you posted

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mudcow007
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PostPosted: 17:29 - 03 May 2014    Post subject: Reply with quote

Update

well boys an girls...after replacing the o-rings in the inlets, stripping the carbs again (they were sticky inside!?), setting the mixture to 2 1/2 turns (the bike came with an old set of carbs that were set to this) stuck fresh fuel in, an it runs without any choke

muhahahahah (evil laugh) Laughing

i was able to ride about 500 yards obviously on a private road etc..an it accelerated where it was holding back

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