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External
Since: Sep 10, 2003
Posts: 693
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(Msg. 1) Posted: Sun Dec 03, 2006 9:21 pm
Post subject: Idling too fast
Archived from groups: uk>rec>motorcycles (more info?)
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I'm sure I've heard of this problem before, but I can't remember what
the cause or solution is...
I've started balancing the carbs on the GSX600F. According to the HBoL,
I set the idle speed to ~1750rpm, and start by balancing 3+4, then 1+2,
then (1+2)+(3+4), IYSWIM.
Easy enough, I thought, but: 3+4 were *way* out, and the nearer they are
to being balanced, the higher the idle speed; like, *really* high,
>3000rpm, and the idle adjuster's backed all the way out.
So, what's causing that then? I've got a feeling it's an inlet rubber
problem, but I'm not sure why... any suggestions?
--
Eddie mailto:eddie@deguello.org |
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External
Since: Jan 23, 2006
Posts: 41
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(Msg. 2) Posted: Sun Dec 03, 2006 9:53 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Eddie wrote:
> I'm sure I've heard of this problem before, but I can't remember what
> the cause or solution is...
>
> I've started balancing the carbs on the GSX600F. According to the HBoL,
> I set the idle speed to ~1750rpm, and start by balancing 3+4, then 1+2,
> then (1+2)+(3+4), IYSWIM.
>
> Easy enough, I thought, but: 3+4 were *way* out, and the nearer they are
> to being balanced, the higher the idle speed; like, *really* high,
> >3000rpm, and the idle adjuster's backed all the way out.
>
> So, what's causing that then? I've got a feeling it's an inlet rubber
> problem, but I'm not sure why... any suggestions?
>
Is there a big difference between 2+3?
A mate of mine borrowed my carbtune and got it a bit arse about face. He
wound the centre screw until (3+4) were nearly dragging the mercury to the
stops and the bike was screaming away at 4,000+rpm. He did get (1+2) in
perfect balance though 
As the revs increased, the balance twixt 3+4 appeared to even out, so he
dropped the idle on the adjuster until it was fully backed out and carried
on oblivious. It was only when the engine was screaming he rang me....
Try adjusting the centre screw to get 2+3 in balance, then the left screw to
get 1+2, the right screw for 3+4 then a little tweak on the centre screw
again. I always found that easier on my teapot than 3+4, then 1+2 then 2+3.
Same on my Bandit, I just find it easier to get to 1/2 a graduation mark on
the scale doing it that way, YMMV
--
Bandit 650
GHPOTHUF #30 |
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External
Since: May 08, 2004
Posts: 1174
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(Msg. 3) Posted: Sun Dec 03, 2006 9:54 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Eddie spoke:
> Easy enough, I thought, but: 3+4 were *way* out, and the nearer they are
> to being balanced, the higher the idle speed; like, *really* high,
> >3000rpm, and the idle adjuster's backed all the way out.
>
> So, what's causing that then? I've got a feeling it's an inlet rubber
> problem, but I'm not sure why... any suggestions?
Hemmm... Could it be an inlet rubber problem?
--
Rob_P
UKRM(at)indqualtec.co.uk
uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl)
FJ1200, CCM130
Atonal apples and amplified heat available now! >> Stay informed about: Idling too fast |
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External
Since: Mar 25, 2006
Posts: 828
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(Msg. 4) Posted: Sun Dec 03, 2006 10:08 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Eddie <eddie.RemoveThis@deguello.org> wrote:
> I'm sure I've heard of this problem before, but I can't remember what
> the cause or solution is...
>
> I've started balancing the carbs on the GSX600F. According to the HBoL,
> I set the idle speed to ~1750rpm, and start by balancing 3+4, then 1+2,
> then (1+2)+(3+4), IYSWIM.
>
> Easy enough, I thought, but: 3+4 were *way* out, and the nearer they are
> to being balanced, the higher the idle speed; like, *really* high,
> >3000rpm, and the idle adjuster's backed all the way out.
>
> So, what's causing that then? I've got a feeling it's an inlet rubber
> problem, but I'm not sure why... any suggestions?
Idle speed always increases as you balance the carbs. It doesn't matter,
as long as they're all reading the same. Get them all reading the same
on the gauges, and then turn down the idle speed.
--
BMW K1100LT 750SS CB400F CD250 Z650
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells..... >> Stay informed about: Idling too fast |
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External
Since: Sep 10, 2003
Posts: 693
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(Msg. 5) Posted: Sun Dec 03, 2006 10:09 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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Moon Badger wrote:
>
> Is there a big difference between 2+3?
Not now there isn't, no. But that's a bit academic unless I can get the
idle down to something sensible.
> Try adjusting the centre screw to get 2+3 in balance, then the left screw to
> get 1+2, the right screw for 3+4 then a little tweak on the centre screw
> again. I always found that easier on my teapot than 3+4, then 1+2 then 2+3.
> Same on my Bandit, I just find it easier to get to 1/2 a graduation mark on
> the scale doing it that way, YMMV
Hmmm... I'd give it a go, but they're all pretty close now. I'm not that
fussed about playing about with them again, unless it's going to help
the idle problem.
--
Eddie mailto:eddie@deguello.org >> Stay informed about: Idling too fast |
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External
Since: Jan 02, 2004
Posts: 4780
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(Msg. 6) Posted: Sun Dec 03, 2006 10:51 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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On Sun, 3 Dec 2006 22:08:15 +0000,
chateau.murraySPAMKILL.TakeThisOut@dsl.pipex.com (The Older Gentleman) wrote:
>Eddie <eddie.TakeThisOut@deguello.org> wrote:
>
>> I'm sure I've heard of this problem before, but I can't remember what
>> the cause or solution is...
>>
>> I've started balancing the carbs on the GSX600F. According to the HBoL,
>> I set the idle speed to ~1750rpm, and start by balancing 3+4, then 1+2,
>> then (1+2)+(3+4), IYSWIM.
>>
>> Easy enough, I thought, but: 3+4 were *way* out, and the nearer they are
>> to being balanced, the higher the idle speed; like, *really* high,
>> >3000rpm, and the idle adjuster's backed all the way out.
>>
>> So, what's causing that then? I've got a feeling it's an inlet rubber
>> problem, but I'm not sure why... any suggestions?
>
>Idle speed always increases as you balance the carbs. It doesn't matter,
>as long as they're all reading the same. Get them all reading the same
>on the gauges, and then turn down the idle speed.
er, TOG - he said the idle adjuster was already backed all the way
out.
For my money, I'd check that there's some slack in the throttle cable.
And also check that all the carb clamps are done up tight.
--
Champ
ZX10R
GPz750turbo
My advice as your attorney is to buy a motorcycle
to email me, neal at my domain should work. >> Stay informed about: Idling too fast |
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External
Since: Jan 23, 2006
Posts: 41
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(Msg. 7) Posted: Sun Dec 03, 2006 11:12 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Lozzo wrote:
> Moon Badger says...
>
>> Try adjusting the centre screw to get 2+3 in balance, then the left screw
>> to get 1+2, the right screw for 3+4 then a little tweak on the centre
>> screw again. I always found that easier on my teapot than 3+4, then 1+2
>> then 2+3. Same on my Bandit, I just find it easier to get to 1/2 a
>> graduation mark on the scale doing it that way, YMMV
>
> You really should treat 3 as the datum, try and keep that reading
> constant and not change its height on the gauge. Wind the right screw to
> get 4 to meet it and then adjust 1 and 2 to match each other. After you
> have that sorted you balance the two pairs to match each other by
> adjusting the centre screw.
>
3 is the datum. The left screw does 1 ( or 2, can't find the Haynes ), the
centre screw does (1+2) against 3 and the right screw effectively only
controls 4.
> It's not that difficult if you don't have air leaks. When I start I
> always wind the tickover up so the bike is at 1,500 revs to start with,
> the engine runs a lot smoother there and makes balancing easier.
> Obviously you wind the tickover back down once balancing is completed.
>
Champ pointed out throttle cable slack and clamps, worth checking. FWIW,
I've used vaseline ( feed lines 'R' us ) smeared on carb inlet rubbers to
check for leaks. It fill the cracks ( oo-er ) temporarily and doesn't
damage the rubber.
Another thing worth checking for is crud on the mechanism, especially
embedded crud in the springs stopping the butterflys from closing fully.
--
Bandit 650
GHPOTHUF #30 >> Stay informed about: Idling too fast |
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External
Since: Mar 25, 2006
Posts: 828
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(Msg. 8) Posted: Mon Dec 04, 2006 7:22 am
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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Champ <news.TakeThisOut@champ.org.uk> wrote:
>
> er, TOG - he said the idle adjuster was already backed all the way
> out.
Oh yeah. Duh.
--
BMW K1100LT 750SS CB400F CD250 Z650
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells..... >> Stay informed about: Idling too fast |
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External
Since: Jun 26, 2006
Posts: 78
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(Msg. 9) Posted: Mon Dec 04, 2006 7:43 am
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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"Champ" <news DeleteThis @champ.org.uk> wrote in message
news:j6l6n211itn7fv4akblr90n124jc23kfue@4ax.com...
>
> er, TOG - he said the idle adjuster was already backed all the way
> out.
I'm glad somebody's paying attention.
> For my money, I'd check that there's some slack in the throttle cable.
I unhooked it, just to make sure.
> And also check that all the carb clamps are done up tight.
They are, but I'll double-check. >> Stay informed about: Idling too fast |
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External
Since: Jun 26, 2006
Posts: 78
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(Msg. 10) Posted: Mon Dec 04, 2006 7:45 am
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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"Lozzo" <lozzo RemoveThis @lozzo.org.uk> wrote in message
news:MPG.1fdd6e8939102d8d989c29@news.individual.net...
>
> Spray carb cleaner onto them, if the revs rise you've got a leak.
.... is what I'll be trying next. >> Stay informed about: Idling too fast |
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External
Since: Feb 21, 2006
Posts: 708
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(Msg. 11) Posted: Mon Dec 04, 2006 8:16 am
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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On Sun, 03 Dec 2006 21:54:06 GMT, Rope <spam RemoveThis @ukrm.net> wrote:
>Eddie spoke:
>> So, what's causing that then? I've got a feeling it's an inlet rubber
>> problem, but I'm not sure why... any suggestions?
>
>Hemmm... Could it be an inlet rubber problem?
Rope - as useful as ever.
--
Pip: B12 >> Stay informed about: Idling too fast |
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External
Since: May 08, 2004
Posts: 1174
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(Msg. 12) Posted: Mon Dec 04, 2006 7:54 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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Pip spoke:
> >> So, what's causing that then? I've got a feeling it's an inlet rubber
> >> problem, but I'm not sure why... any suggestions?
> >
> >Hemmm... Could it be an inlet rubber problem?
>
> Rope - as useful as ever.
String is a very good thing
Rope is thicker
but string is quicker.
er... that didn't help much, did it?
--
Rob_P
UKRM(at)indqualtec.co.uk
uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl)
FJ1200, CCM130
Atonal apples and amplified heat available now! >> Stay informed about: Idling too fast |
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External
Since: Sep 10, 2003
Posts: 693
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(Msg. 13) Posted: Mon Dec 04, 2006 9:13 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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Eddie wrote:
> "Lozzo" <lozzo.DeleteThis@lozzo.org.uk> wrote in message
> news:MPG.1fdd6e8939102d8d989c29@news.individual.net...
>
>>Spray carb cleaner onto them, if the revs rise you've got a leak.
>
> ... is what I'll be trying next.
Well, that didn't help.
I did notice something potentially interesting though, while I was
fiddling about: uncovering the vacuum connections whilst the engine's
running causing the engine to die (well, duh)... but not, apparently,
#4, which appears to make no significant difference to the running of
the engine.
Methinks that #4 is not a happy pot...
--
Eddie mailto:eddie@deguello.org >> Stay informed about: Idling too fast |
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External
Since: Jan 02, 2004
Posts: 4780
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(Msg. 14) Posted: Mon Dec 04, 2006 11:57 pm
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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On Mon, 04 Dec 2006 21:13:09 +0000, Eddie <eddie.TakeThisOut@deguello.org> wrote:
>Eddie wrote:
>> "Lozzo" <lozzo.TakeThisOut@lozzo.org.uk> wrote in message
>> news:MPG.1fdd6e8939102d8d989c29@news.individual.net...
>>
>>>Spray carb cleaner onto them, if the revs rise you've got a leak.
>>
>> ... is what I'll be trying next.
>
>Well, that didn't help.
>
>I did notice something potentially interesting though, while I was
>fiddling about: uncovering the vacuum connections whilst the engine's
>running causing the engine to die (well, duh)... but not, apparently,
>#4, which appears to make no significant difference to the running of
>the engine.
>
>Methinks that #4 is not a happy pot...
That's a reasonable conclusion. Perhaps that carb rubber is leaking.
or the carb is leaking air internally (I actually had this happen
years ago). Or it's unhappy internally - get a compresion tester on
it.
--
Champ
ZX10R
GPz750turbo
My advice as your attorney is to buy a motorcycle
to email me, neal at my domain should work. >> Stay informed about: Idling too fast |
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External
Since: Jun 26, 2006
Posts: 78
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(Msg. 15) Posted: Tue Dec 05, 2006 8:51 am
Post subject: Re: Idling too fast [Login to view extended thread Info.]
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"Rope" <spam.DeleteThis@ukrm.net> wrote in message
news:VA.000023fd.0075da88@ukrm.net...
> Pip spoke:
>>
>> Rope - as useful as ever.
>
> String is a very good thing
> Rope is thicker
> but string is quicker.
>
> er... that didn't help much, did it?
Not really, Spike. >> Stay informed about: Idling too fast |
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| Related Topics: | | Fast fuzz. - The Daily Mail today reported a Shropshire policeman being nicked for 159mph in a Vauxhall Vectra. What sort of plod Vectra does that sort of speed? Why am I reading the Daily Mail? -- Eiron. |
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