Flat spot in dyno curve - Honda Motorcycles - FireBlades.org
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post #1 of 20 Old 03-07-2007, 1:12 PM Thread Starter
 
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Flat spot in dyno curve

I bought this bike not running and was wondering if anyone has any insight into a flat spot in my motor between 4000-5500rpm. I have had it into the shop on the dyno to get it tuned out but there is nothing working. I have the Denso plugs and they are burning fine so its not the spark plugs. It has a k&n filter in it right now and I will be changing it to a stock filter. Im running 93 octane fuel, the chain is good, so the shop has no idea whats wrong. I know there are some inteligent people on here that can probably point out something we are missing.
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post #2 of 20 Old 03-07-2007, 1:52 PM
 
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Re: Flat spot in dyno curve

Going back to a stock filter is good. Put in 87 octane and see what happens then. No pipe or anything on it?

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post #3 of 20 Old 03-07-2007, 2:07 PM
 
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Re: Flat spot in dyno curve

Is the flapper valve working?
That RPM range is where it changes.

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post #4 of 20 Old 03-07-2007, 2:08 PM Thread Starter
 
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Re: Flat spot in dyno curve

Full acropovic exhaust and open flapper valve with a pc3
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post #5 of 20 Old 03-07-2007, 2:09 PM
 
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Re: Flat spot in dyno curve

custom map on the pc or one downloaded from their site?
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post #6 of 20 Old 03-07-2007, 2:12 PM Thread Starter
 
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Re: Flat spot in dyno curve

its a custom map
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post #7 of 20 Old 03-07-2007, 2:16 PM
 
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Re: Flat spot in dyno curve

Because it's a full exhaust it may just be the acro's design.

Same thing happened with the full erion on a 929.

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post #8 of 20 Old 03-07-2007, 2:16 PM
 
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Re: Flat spot in dyno curve

Take a look at the map. Alot of people try to richen it up in that RPM range. You know, if its weak throw some more gas at it until it works right. But you actually have to lean it out in that range.

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post #9 of 20 Old 03-07-2007, 2:20 PM Thread Starter
 
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Re: Flat spot in dyno curve

no they leaned it way out b/c it was a little rich right there. the ega is reading the correct ratio everywhere thats why we are stumped
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post #10 of 20 Old 03-07-2007, 2:24 PM
 
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Re: Flat spot in dyno curve

Post the chart and almost anyone here will be able to tell if something is out of wack.

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post #11 of 20 Old 03-07-2007, 2:32 PM Thread Starter
 
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Re: Flat spot in dyno curve

the file is saved as a tif how can I change it?
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post #12 of 20 Old 03-07-2007, 2:40 PM
 
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Re: Flat spot in dyno curve

Quote:
Originally Posted by visitor View Post
the file is saved as a tif how can I change it?
Try opening the .tif file in Microsoft Paint, then do a Save As and change it to a .jpg
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post #13 of 20 Old 03-07-2007, 2:44 PM Thread Starter
 
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Re: Flat spot in dyno curve

sorry my brain is fried today thanks
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dyno sheet.JPG‎  
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post #14 of 20 Old 03-07-2007, 2:46 PM Thread Starter
 
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Re: Flat spot in dyno curve

well that looks like crap
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post #15 of 20 Old 03-07-2007, 3:06 PM
 
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Re: Flat spot in dyno curve

No worries. Any chance of having it tuned by a Dynojet 250?
It has always been hard to decypher a winpep chart. One of the reasons is that they use MPH instead of RPM. Also, on a Dynojet 250, they show you a corrilating A/F ratio chart.

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