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Author Topic: 5000 - 7000 flat spot  (Read 375 times)

Boostinu13

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5000 - 7000 flat spot
« on: November 17, 2018, 04:04:24 PM »

Hello. On my 2011 efi when I am around 5-7k rpm the bike doesn't really move. You can full throttle and it is very slow. Get passed.7 and Bam it gets and 1-5k rpm is ok also.  Just a major flat spot at 5-7k any reason why this may be?

I saw the flat spot topic here - http://korider.com/index.php?topic=16600.0   but nothing for 2011 and says does not work on efi models.

Thanks
« Last Edit: November 17, 2018, 08:27:06 PM by Boostinu13 »
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zundapp

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Re: 5000 - 7000 flat spot
« Reply #1 on: January 15, 2019, 03:18:50 PM »

HelloBoostinu13:

My 2012 GT250 (naked) is experiencing the same problem as your bike.  Mine intermittently goes flat in the 5000 - 6000 rpm range.  Am reluctant to purchase a new CDI unit without confirming that is the problem and I do not know how to check my current CDI.

Have you solved your problem?  If so, how?
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umop-ǝpisdn

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Re: 5000 - 7000 flat spot
« Reply #2 on: January 15, 2019, 08:19:52 PM »

A 2012 bike is EFI. It would not have a CDI unit. The 'wire cut' thing is only for much older bikes.

If you have a flat spot with an EFI bike, it's probably an air issue. Have you checked the air filter recently?
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zundapp

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Re: 5000 - 7000 flat spot
« Reply #3 on: January 16, 2019, 06:28:03 PM »

umop:

Thanks for the tip.  Will check air filter.
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Boostinu13

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Re: 5000 - 7000 flat spot
« Reply #4 on: January 22, 2019, 08:44:39 AM »

umop:

Thanks for the tip.  Will check air filter.

Hi any luck with yours?  No one had replied to forgot about this.  I still get the flat spot badly.  The Air filter is fine.  The last owner hacked the top hole to make it larger but besides that is quite clean.
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Joss

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Re: 5000 - 7000 flat spot
« Reply #5 on: January 22, 2019, 09:58:53 AM »

The last owner hacked the top hole to make it larger but besides that is quite clean.

If you have a flat spot with an EFI bike, it's probably an air issue.

I think that really answers your question. Did you "un-largen" the hole back to stock air intake?
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spit051261

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Re: 5000 - 7000 flat spot
« Reply #6 on: January 22, 2019, 02:37:56 PM »

Be fine because it's "clean"  ;D
Makes all the difference :o
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umop-ǝpisdn

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Re: 5000 - 7000 flat spot
« Reply #7 on: January 22, 2019, 11:52:04 PM »

As far as I know, Joss is correct.

One way or the other ANY change to air flow will affect air:fuel ratio.
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Boostinu13

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Re: 5000 - 7000 flat spot
« Reply #8 on: January 23, 2019, 05:26:04 AM »

As far as I know, Joss is correct.

One way or the other ANY change to air flow will affect air:fuel ratio.

I was hoping the oxygen sensor would regulate that so was hoping the increased size would not house  any issues or minimal like a car for example.  Also it was jus tthe hole into the filter obviously not to the engine. 
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spit051261

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Re: 5000 - 7000 flat spot
« Reply #9 on: January 23, 2019, 09:40:32 AM »

You need a scan tool see if it's running lean  :D
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