Bike jerks with slight acceleration? - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 11 Old 06-12-2016, 09:57 PM Thread Starter
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Bike jerks with slight acceleration?

Hi, not sure if this is a technique issue or a bike issue.

When i'm riding along(or slowing down) with the throttle closed and need to accelerate again even the slightest throttle input makes the bike jerk abit.
its not violent but it doesn't seem smooth.

Is this normal? do i need to feather abit to smooth it out?
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post #2 of 11 Old 06-12-2016, 10:48 PM
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This cld very well be learning clutch/throttle control which comes with repetition and experience. When you're in the car park practising, spend time with perfecting the friction point. Once you feel comfortable with it your stops and starts will be more smooth.
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post #3 of 11 Old 06-13-2016, 01:27 AM
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In the BRC class, they always told us "Clutch is smooth, gas is jerky", and that's true. If you use only the throttle chopped to slow down, then crack the throttle open, the drivetrain slack will catch with the power change and it will be much more abrupt.
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post #4 of 11 Old 06-13-2016, 09:20 AM
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I'm thinking you may be lugging the engine.

In order to accelerate without lugging you may need to downshift and get the engine into a range where it's producing enough power for the acceleration you want.

Try downshifting and getting the RPMs in the 4000 to 5000 range when you are accelerating.

Also make sure the chain slack is adjusted properly. Excessive slack, or even not enough slack, can cause odd problems.
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post #5 of 11 Old 06-13-2016, 10:26 AM Thread Starter
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Quote:
Originally Posted by cbrlocal View Post
In the BRC class, they always told us "Clutch is smooth, gas is jerky", and that's true. If you use only the throttle chopped to slow down, then crack the throttle open, the drivetrain slack will catch with the power change and it will be much more abrupt.
Went for a ride before and used the clutch to "ease into" acceleration after the throttle was rolled off. ie: the lights changed and i needed to continue.

Much more smooth, But wont that put excessive wear on the clutch if i'm doing this in 2nd or 3rd gear?

Thought using the friction zone was only for low speed stuff?
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post #6 of 11 Old 06-13-2016, 10:48 AM
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You should not need any special clutch techniques to get a smooth upshift.

What RPMs are you shifting at?
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post #7 of 11 Old 06-13-2016, 11:44 AM
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I find the CBR250 throttle to have a bit of an ON/OFF effect. I believe that's due to the fuel injected nature of the beast.

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post #8 of 11 Old 06-13-2016, 02:18 PM
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Quote:
Originally Posted by Corey View Post
Went for a ride before and used the clutch to "ease into" acceleration after the throttle was rolled off. ie: the lights changed and i needed to continue.

Much more smooth, But wont that put excessive wear on the clutch if i'm doing this in 2nd or 3rd gear?

Thought using the friction zone was only for low speed stuff?
Me, I actually usually coast clutch in, in gear. So I downshift to the gear I will need when and if the light changes, but I do so with the clutch in to save gas.

If coasting clutch out and in gear, usually a smooth easy throttle opening removes a lot of the chop. That practice will come with time, and you'll get better at it. But coming on and off the throttle in gear with no clutch action will always have a little "jolt", just due to the nature of the drivetrain.
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post #9 of 11 Old 06-13-2016, 03:21 PM
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Besides technique, there could be too much slack in the throttle, or too much slack in the drive chain.
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post #10 of 11 Old 06-13-2016, 06:30 PM
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its all down to control of smooth transmission of
engine power to the rear wheel,, via clutch control..

there must be sufficient power to start with,
ie, sufficient revs to create sufficient power..
if your revs are too low, then it needs slow
release of clutch, esp above first gear..

for practical purposes, its all down to your clutch
and how much you feed in to the process..
you will not damage your clutch by normal
shifting or control of momentum..

there will also be a zone where throttle is not increasing
but not switching power off, from which you can
accelerate easily without jerkiness etc..
practice, repetition, finding this sweet spot
with throttle will make riding easier and better..

yet regardless of that, riders will still use clutch control
in virtually all sorts of general riding..
if in doubt, simply draw clutch in with fingers
and release smoothly as you increase throttle..

anything you notice on the road that seems 'wrong'
take as feedback from your motorcycle saying
'go practice this'.. practice does make perfect..

anything you specifically practice will switch on brain
to something 'important' resulting in that then becoming
a form of continuing practice out on the roads..
this cant be underestimated for skills development..
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