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Author Topic: CB210T "Stuttering" problem  (Read 885 times)

Offline Camaromuscle

  • Posts: 15
CB210T "Stuttering" problem
« on: Apr 30, 2017, 08:07:33 »
Hi,

I have a 1981 Honda CB125T with a 210cc bigbore kit.
I am having some "stuttering" problems when i ride the bike, and it gets worse when the bike gets warmer.
If i ride downhill and "force" the bike past the stuttering it is ok, but if i ride uphill and the engine is under load it will just keep stutter.
It idles fine, the problem only occurs during 3/4 throttle and under load.

Little history: I did not ride the bike that much with original airfilters and exhaust, therefore i do not know if the problem was present then as well.
I have 2 original keihin PD26 carburetors with UNI pod filters.
Also before i installed the big bore kit i had this problem, and i did some experiments with pipes between the airfilter and carburetor, which helped a little bit.
the original airbox is damaged and thrown away so i cant test with that.

With 125cc i had 95 main jets, now i have 110, and i have synchronized the carbs with a vacuum gauge.


Could this be my timing, valve gaps or is it most likely carburetor related?




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« Last Edit: Apr 30, 2017, 08:20:11 by Camaromuscle »

Offline interceptor

  • Posts: 865
Re: CB210T "Stuttering" problem
« Reply #1 on: Apr 30, 2017, 17:31:51 »
Do you think that maybe it could it be the clutch?
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline Camaromuscle

  • Posts: 15
Re: CB210T "Stuttering" problem
« Reply #2 on: May 01, 2017, 06:17:47 »
I forgot to mention that the clutch is rebuilt recently, and i think i would felt a more mechanical stuttering if it was the clutch?

Offline interceptor

  • Posts: 865
Re: CB210T "Stuttering" problem
« Reply #3 on: May 01, 2017, 07:01:31 »
I am not an expert in any capacity, but I think the stuttering would not go away at any speed if it were a lack of fuel (jets), it would continue throughout the whole range.  Getting worse as it warms up seems like something else other than fuel related to me.  Have you looked at the spark plugs?
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline TheCoffeeGuy

  • Posts: 608
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Re: CB210T "Stuttering" problem
« Reply #4 on: May 01, 2017, 08:53:49 »
I would check your timing chain tension.
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Offline Camaromuscle

  • Posts: 15
Re: CB210T "Stuttering" problem
« Reply #5 on: May 01, 2017, 15:21:36 »
The spark plugs have a good white/brown colour.
I checked the timing chain today, and that was ok.

i checked the ignition timing and the right cylinder is firing a little late?

I have now ordered new circuit breakers, and will try to align everything better.

Offline Sonreir

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Re: CB210T "Stuttering" problem
« Reply #6 on: May 01, 2017, 15:41:21 »
The problem getting worse as the engine warms is a bit telling.

Sounds like you might be running lean.

Try some larger jets and see how things go.
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Offline Camaromuscle

  • Posts: 15
Re: CB210T "Stuttering" problem
« Reply #7 on: May 03, 2017, 12:57:36 »
I have actually bought genuine OKO flatslide carbs now, as i am tired of the stock ones.
Hope it will help with the correct jetting.

Offline interceptor

  • Posts: 865
Re: CB210T "Stuttering" problem
« Reply #8 on: May 06, 2017, 09:01:09 »
Sweet!  Did you order some new (bigger) jets, too?
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline Camaromuscle

  • Posts: 15
Re: CB210T "Stuttering" problem
« Reply #9 on: May 06, 2017, 11:20:48 »
Yes i did, but now i have a new problem:

I was just going to check my ignition timing, but when i measure the left side contact breaker i always get 12v when i turn the motor?
I have adjusted the gaps on both contact breakers, and the right is ok (goes on and off as it should)

Wht could be the fault with the left side?