This started happening 2 days ago..

The engine seems like it decelerates faster when I let off the throttle. I know it isn't the wheels or brakes decelerating it because when I pull the clutch in the bike rolls really well..
The bike makes more noise. Like its pulling uphill all the time.
It also vibrates a LOT more than before, at anything over 2000 rpm..
The only mod that the bike has are a set of akrapovic sp cans, and no catalytic converters.
Before it didn't do these things.
Precisely 1 week ago I had the oil changed on the bike... 14000km
Anyone know what the problem might be? KEV?

Try refitting your standard exhaust to see if that fixes the problem.

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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

I know its not the exhaust because it didn't do this even with the akrapovic cans before, but I will do it and post results here.

Had, I guess means you didn't do it? Was it overfilled? Have you checked the level since? Has the airbox got contaminated with oil or is the stock paper element oil-soaked? Have you checked the drain hose?

Clutching at straws here though.

Can you think of anything else that was new, changed or done differently to the bike in the last few days?

When you say more noise, do you mean induction, mechanical, or exhaust type sounds?

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The noise is just like the regular noise the bike makes, except louder, and no, absolutely no chances were made to the bike other than the cans that i've always used

My XTR dose that all the time...
seems to coinside with what helmet I'm wearing
FFM ADV or AGV road helmet..




.

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The easyest way to turn gasoline into noise with out the side efect of horse power...

Did you make any fuelling adjustments when you fitted the Akropovic?

What colour is the spark plug tip? Have you done a compression check?

It may be that by running open aftermarket exhausts the fuelling has been weakened - enough to burn a valve.

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Simon

Brighton, UK

I had these cans before it started making noise and vibrating, nothing was changed

Sounds daft but did u blast out yoyre baffles did it have them fitted? These akros can be a sod for spitting them out of not megga tight lol

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Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen

I didn't mention it but i've always used my exhausts without baffles, so that isnt the problem