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Idle speed

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rongsted
Squiddy
Squiddy

Posts : 12
Location : Copenhagen

Idle speed

Post by rongsted on Sun 07 Apr 2013, 8:50 am

Hi
I was doing some late bed reading in my Haynes manual and was stunned when I found out that the idle speed is 1300 rmp. My CB 500X all ways have difficulty starting when it's cold. Is there any connection?
God I'm looking forward to the temperature rising above 2C in Denmark!!
Best regards Morten :-)
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eternally_troubled
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Location : 'ere be fens. (near Cambridge)

Re: Idle speed

Post by eternally_troubled on Mon 08 Apr 2013, 12:51 pm

Yes, it is 1300 rpm.

I don't have a problem starting mine - if it is below 5 degrees centigrade (approx.) I use the choke and it is OK.

You can turn it up to 1500 if it works better....
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Basil Moss
the 900
the 900

Posts : 573
Location : Cambridge

Re: Idle speed

Post by Basil Moss on Mon 08 Apr 2013, 5:33 pm

Mine seems to idle at nearly 2,000 revs when it's warm lately, must be time to adjust it. Is that a petrol tank off job? Rolling Eyes

By the way, does the idle adjuster change the throttle plate position or does it alter the flow from the pilot jets?
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rongsted
Squiddy
Squiddy

Posts : 12
Location : Copenhagen

Re: Idle speed

Post by rongsted on Mon 08 Apr 2013, 5:36 pm

It shouldn't be. Last time I looked in Haynes it was easy!. Maby admin has a better answer:-)
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davetheworv
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Location : Birmingham

Re: Idle speed

Post by davetheworv on Mon 08 Apr 2013, 6:42 pm

there is a large yellow screw (think it is knurled)you can turn by hand,ok mine was a little tight but it went eventually. no need to remove tank just have a good look between the carbs,I needed a torch the first time as I couldnt see it,just get the bike to running temp and ticking over then slowly undo it till the speed is correct.

also check your throttle cable isnt too tight,that may also cause high tickover
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WeeTony
Silver Bullet
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Location : Gourock, West Coast

Re: Idle speed

Post by WeeTony on Sun 12 May 2013, 12:52 pm

you can access the idle speed knob from the right hand side (throttle side) reaching under a coolant hose you'll be able to get your finger on to a yellow tap.

use a torch to find it first.

It's right in the middle of carbs, and it's pointing rearward.

Anticlockwise to lower, clockwise to increase revs.

I'm sure it alters flow, rather than change throttle.
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rongsted
Squiddy
Squiddy

Posts : 12
Location : Copenhagen

Re: Idle speed

Post by rongsted on Sun 12 May 2013, 9:03 pm

Cheers
Found it!!
Morten Very Happy
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Grarea
Laser Shark
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Posts : 205
Location : Cornwall

Re: Idle speed

Post by Grarea on Sat 08 Jul 2017, 1:00 pm

Thought I would resurrect this thread rather than start a new one.
(Mainly because I am lazy)

What I was wondering is how much difference you have between cold and warm idle?
Mine is 1500 warm but 1000 when I first start it.
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jchesshyre
the 900
the 900

Posts : 637
Location : Chester

Re: Idle speed

Post by jchesshyre on Tue 11 Jul 2017, 1:38 am

The throttle stop screw determines the 'closed' position of the throttle linkage and does not alter the pilot mixture.
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ZekeVal
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Location : Auxerre, France.

Re: Idle speed

Post by ZekeVal on Tue 11 Jul 2017, 8:40 am

@Grarea wrote:Thought I would resurrect this thread rather than start a new one.
(Mainly because I am lazy)

What I was wondering is how much difference you have between cold and warm idle?
Mine is 1500 warm but 1000 when I first start it.

It's pretty much the kind of range I would expect from mine.

I start it with full-choke, when it start revving above 3k I lower the choke so that it stays above 1k.
After a few hundreds meters, I turn it fully off and it should stay around 1k.
As it gets towards normal operating temperature, it will rise to 1300-1400RPM, and it can rise to 1500 as engine temp increases.
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Grarea
Laser Shark
Laser Shark

Posts : 205
Location : Cornwall

Re: Idle speed

Post by Grarea on Tue 11 Jul 2017, 9:15 am

Ah, yes, mine is exactly that. All year round.
I do see that people don't need the choke at all in the summer.
I am also wondering how theirs behaves.
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ceejay
the 800
the 800

Posts : 269
Location : Bournemouth

Re: Idle speed

Post by ceejay on Tue 11 Jul 2017, 10:20 am

I don't need the choke in summer and literally 3 seconds of it in winter and mine is about the same 1000 until warm then 1500.
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eternally_troubled
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Re: Idle speed

Post by eternally_troubled on Wed 12 Jul 2017, 9:14 pm

No choke in summer for me. In fact, if you use a bit of judicious throttle you can (most of the year) get away without any choke at all - mind you, I live in East Anglia so it doesn't get as cold as some places.
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jchesshyre
the 900
the 900

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Location : Chester

Re: Idle speed

Post by jchesshyre on Wed 12 Jul 2017, 9:28 pm

For years I never used choke except in pretty cold weather, but recently I've decided to always let it run on the choke, or at least half, for 30s or so, the thought being that letting it idle at below 1,000 rpm (as mine does when it's cold with no choke) *might* not develop enough oil pressure to ensure good lubrication during the crucial first half minute or so after startup, whereas the faster idle with the choke on would do.

I have no real evidence to support this, but it makes me feel better. It's also what 'the book' says to do  Laughing

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