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Offline fabio

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reducing jerkiness
« on: April 22, 2015, 08:06:25 PM »
I found my bike to suffer from some jerkiness when re-opening gas after it was completely released (what is sometimes called "on/off" effect).
I'm not saying it's something so bad, neither specific to the CB, since almost all modern electronic injected bikes suffer from some on/off.
However, I always try to reduce the on/off in my bikes as much as possible, since it really bothers me especially when riding with cold weather and bad asphalt conditions.
I think the best solution would be adding some electronic stuff like dynojet, but most times I was ok by simply rising engine idle (slightly), may be rising it about 100rpm.
The problem is: HOW can you adjust idle???? There is no screw for idle adjustment and no info in the user manual!!
(SERVICE MANUAL owners: does service manual say anything about idle tuning???)

Offline Triplebrew

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Re: reducing jerkiness
« Reply #1 on: April 22, 2015, 09:39:11 PM »
As far as I know the ECU regulates idle speed using various sensors and parameters so is not adjustable?

Offline Chippy jon

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Re: reducing jerkiness
« Reply #2 on: April 22, 2015, 10:09:04 PM »
I would be interested in this on/ off effect answer. My dealer said it was me not being use to the electronic throttle.  :187:

Offline jsonder

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Re: reducing jerkiness
« Reply #3 on: April 22, 2015, 11:47:29 PM »
If the idle cannot be adjusted, then, you must be slower and more gentle in letting out the clutch.

Personally, my worst problem is idling towards the garage door as the door opener is SLOWLY raising the door.  I have to alternate between disconnected and just barely dragging (almost disconnected) so that there is a lot of slipping going on.  Alternatively, I could stop and wait for the door to be fully opened, but that isn't as challenging. :001:
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Offline EscCtrl

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Re: reducing jerkiness
« Reply #4 on: April 22, 2015, 11:54:29 PM »
*Originally Posted by fabio [+]
I found my bike to suffer from some jerkiness when re-opening gas after it was completely released (what is sometimes called "on/off" effect).
I'm not saying it's something so bad, neither specific to the CB, since almost all modern electronic injected bikes suffer from some on/off.
However, I always try to reduce the on/off in my bikes as much as possible, since it really bothers me especially when riding with cold weather and bad asphalt conditions.
I think the best solution would be adding some electronic stuff like dynojet, but most times I was ok by simply rising engine idle (slightly), may be rising it about 100rpm.
The problem is: HOW can you adjust idle???? There is no screw for idle adjustment and no info in the user manual!!
(SERVICE MANUAL owners: does service manual say anything about idle tuning???)

Two things that helped me.

1)Adjust chain slack.Sometimes chain whip from a slack chain can cause a similar issue.

2)Adjust the throttle cable so there is very little play.

This helped mine but didn't completely eliminate it.

The only way to set the idle is through an add on unit.Anything done to adjust the idle could result in performance problems.
Artist also known as ben2go.
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Six=Suzuki GS500,'00 V Star Classic,'14 CB500X farkled out nicely.
I rescue neglected and battered motorcycles.

Offline Defender

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Re: reducing jerkiness
« Reply #5 on: April 23, 2015, 12:04:55 AM »
If it only happens noticeably in 1st gear, sprocket change will alleviate it, I have found.
If I can help somebody as I go along, then my living has not been in vain.

Offline EscCtrl

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Re: reducing jerkiness
« Reply #6 on: April 23, 2015, 01:25:21 AM »
*Originally Posted by Defender [+]
If it only happens noticeably in 1st gear, sprocket change will alleviate it, I have found.

Which sprocket and what size?
Artist also known as ben2go.
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Six=Suzuki GS500,'00 V Star Classic,'14 CB500X farkled out nicely.
I rescue neglected and battered motorcycles.

Offline Defender

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Re: reducing jerkiness
« Reply #7 on: April 23, 2015, 03:11:35 AM »
I went to 39T on rear sprocket, but using 16T on drive sprocket has same effect but doesn't require chain to be shortened. Posts on this are legion
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Offline Nortoon

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Re: reducing jerkiness
« Reply #8 on: April 23, 2015, 03:38:19 AM »
When I first had my CB500 I found it jumpy in first gear because of the quick acting fuel injection and close ratio transmission. It took a while to learn to feather the clutch in first gear, so slow speed maneuvers could be done smoothly.

There is no magic fix, just a skill that has to be practiced and mastered.

When down gearing for city intersection turns, I would suggest using second gear to smooth things out. That is the primary reason I bought a digital gear indicator.


Offline incolx

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Re: reducing jerkiness
« Reply #9 on: April 23, 2015, 08:24:09 AM »
As reported in another thread, the quick and easy answer to this is to add a little play to the throttle cable.  I did this very soon after picking up the bike and it works so well I hadn't thought about it for ages.

The extra play takes care of any involuntary twitches of the wrist.

 


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