Rode around today to see if the surging would stop because I installed the DNA stage 1 airfilter.

Actually it got worse.
Next to that my Leovince X3 exhaust stopped backfiring.
(don't know what that means but I liked the backfiring )

So I pulled my sparkplug to see that it was dry and black.
That would mean it is running to rich (i think).
But why do I have a problem with it now After installing the new airfilter.
To me it does not make sense.... but I ain't a mechanic.

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2010 XT660X

More air = leaner the Air/Fuel ratio. You will not cure the surging completely but with a good A/F ratio the ride can be improved upon.

I would recommend a custom made fuel map using a Power Commander.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

The stg 1 filter will allow more air into the engine so to get it back to the way you like it you need to put some more fuel in. You can change your CO read out (look at kevs signature below his post about mods) this will change the fuelling on the bike slightly but nothing great.

Next would be to either buy a kev fuel mod (about �40 if i remeber correct) or a Power commander (from �300 or so up to �500 including time on the dyno, fuel etc etc). Both have plenty of information on the site about.

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Plough on

I am planning a PCIII and DNA stage 2 for next year.
mostly because I want a POV 1.5 first
But anyway I was just confused at how the bike was feeling and how the spark plug looked.

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2010 XT660X

Fixed, CO set to a whopping +13

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2010 XT660X

and whats the out comes?

Some times its best to put it up by 2-3 go for a ride and see what its like. Took me about 3-4 goes to find the best position for me.

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Plough on