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Old 07-17-2013, 09:20 PM   #1
goodcat8 OP
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Location: Los Angeles
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'08 990 Flat Spot @ 5100 RPM

Just picked up a sweet 08 990. I was all worries about the dreaded light switch throttle but there's no issue there at all (throttle cam aids in that I'm sure). Overall then fueling is fantastic, only issue is a lag between exactly 5100-5300 RPM. I can short shift before it, or if I'm hauling ass blast right threw it and not notice, but of course 5200 is my sweet spot for shifting and or cruising.
Bike has FMF slip ons, K&N filter, stock map. She pops a little on de-excel but so did my 950. I'm assuming that means she's running a little rich.
Is there a go-to common map for this or should I go custom.
Bikes amazing!
Thanks for any input and thanks to the Orange Crush for making my bank account much much smaller
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Old 07-18-2013, 09:50 PM   #2
rossguzzi
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If it is the stock map, I can recomend getting a TuneEcu cable $70 aprox and down load the Akra map from the TuneEcu website.
It worked wonders for my 06 990. That and the Throttle tamer 400.
Popping on decel is a sign it is running lean. Not good in my veiw.
I am getting 17 kpl now, smooth running at between 4-6, much better on-off and just a gurgle on decel, not poping.
Some people are more worried about fuel comsumption. I am more worried it is getting correct air/fuel mix. So I am staying with the Akra map.
Cheers.
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Old 07-18-2013, 10:21 PM   #3
skidxr
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I have the same thing going on with mine. If you figure it out please let me know. I have some wings exhaust coming and plan to mess with it using tune ecu.
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Old 07-29-2013, 09:17 AM   #4
skidxr
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I installed the new Wings exhaust and loaded the Akro map using TuneECU. The flat spot is 100% gone now. Runs perfect !!! Not sure if MPG has changed or not yet but if it did it's not much of a difference. On average the fuel light will come on at 165 miles and I have gone as far as 145 miles so far and still has not come on. Very happy now !!!
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Old 08-01-2013, 01:24 PM   #5
goodcat8 OP
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Quote:
Originally Posted by skidxr View Post
I installed the new Wings exhaust and loaded the Akro map using TuneECU. The flat spot is 100% gone now. Runs perfect !!! Not sure if MPG has changed or not yet but if it did it's not much of a difference. On average the fuel light will come on at 165 miles and I have gone as far as 145 miles so far and still has not come on. Very happy now !!!
That's great news!
I've adjusted to it but am still looking for a fix. Have you read this....

http://advrider.com/forums/showthread.php?t=589472

Curious to give it a shot.

I'm making an appointment for a custom map sometime this week. My mileage is all over the place. Best before fuel light 147, worst 111
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goodcat8 screwed with this post 08-01-2013 at 03:06 PM
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Old 08-01-2013, 01:50 PM   #6
pman13
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I have the same problem on my 07 990. I tried the Arka map but the mileage plummeted and it wasn't worth it to me.
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Old 08-01-2013, 01:57 PM   #7
skidxr
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This is the map I used KM601AK0702S01Map.hex OEM
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Old 08-01-2013, 03:07 PM   #8
goodcat8 OP
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These bikes are like finger prints and wild animals. No 2 seem to be the same.

Also, where'd you pick up the wings from?
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Old 08-01-2013, 04:01 PM   #9
skidxr
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Yeah that's the truth !!!

I bought directly from Wings. Great to deal with.
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Old 08-01-2013, 04:11 PM   #10
Hootowl
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I'm on my fourth map
1. OEM 07 serious flat spot
2. KTM Akra less flat spot, MPG mid 30's. Yuck.
3. Inmate created map
4. Another inmate created map

Each map was better than the last. Number 3 was very good. Took away the flat spot and MPG improved significantly over the KTM Akra. MPG low 40's most rides.
Number 4 was recently loaded and it appears to be better than #3. A ride of 127 miles resulted in MPG of 45, along with "crisper" throttle response. Made me very happy.
I can send via email either 3 or 4 or both.
YMMV and I'm not responsible for any possible engine damage
Richard
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Old 08-01-2013, 04:22 PM   #11
skidxr
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I think the dyno would be the best fix for this. I still would like to have mine dyno tuned if I could find anyone close to do it.
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Old 08-01-2013, 05:47 PM   #12
goodcat8 OP
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Ill keep ya posted after mines dyno tuned. KTM dealer tech was straight up with me, he said "we can load any of the pre made maps for you, but they're all just a band-aid, each bike needs a solid dyno tune surgical procedure to really bring her to life."

Well put I though.
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Old 08-02-2013, 10:30 AM   #13
Irideeverything
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08 flat spot

My 08 developed a flat spot 3800 to 4200 but sounds the same as yours. If you power thru it you don't feel it, but trying to cruise at that RPM drove me nuts !!

I have the cable and software and tried a variety of maps with no results.

I resolved the flat spot by cleaning out these brass air jets in the intake of each cylinder. Remove the injectors and the air box. There are 4 brass jets, 2 per cylinder, that have rubber hoses leading to what I assume are air sensors. Pull them out and soak them for a few hours. Clean them out with a fine wire.
Inside the intake mine had a ton of gummy residue. I used a dental tool and chipped it off while sucking it up worth the shop vac. Just pretend you are the dentist cleaning teeth. Why mine was doing is when I used a high concentration of sea foam or other additives, it would soften and melt the residue, which ran down the inside of the intake and flowed into the air jets, clogging the, providing bad o2 readings.

This worked for me, and I know of another 08 990 that had the same thing

My 990 came to me this past January with 46xx miles. It sat a lot.... It WAS all gummed up, but it runs great now.....

Good luck !

And while I had the injectors put they got a real good cleaning, and I adjusted the TPS, which was in spec, but is close to desired now. Can't remember the exact numbers, sorry
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Old 08-02-2013, 08:57 PM   #14
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Iride, that makes a lot of sense. You don't happen to have a pictorial walk-thru of that by any chance would you?
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Old 08-03-2013, 03:39 AM   #15
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Pictures

What a great idea, I thought the same after I finished....

Nop, sorry... I was so busy doing, I didn't document. This was exploratory so I didn't know what I was even looking for until I found it....

Just tear it apart until you get the air box out, you will see the air hoses then....
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