AIS Removal/ Disable:
To disable the AIS all you need to do is disconnect the blue plug that comes out of the top of the pump which is located behind the horn.


Unfortunately the only way to do this is to remove the seat, side panels, tank panels and then unbolt the tank. Instructions for removing the panels can be found in your Yamaha owner�s manual.
Do not disconnect the fuel lines to the tank, you should be able to slide the tank far enough back to give you access to the pump.



Disconnect the blue connector, i used some electrical tape and taped over the exposed connector on the pump. Then I used some Vaseline and covered the end of the connector



DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY.

A BIT OF BACK ROUND

AIS :air induction system burns unburned exhaust gases by injecting fresh air into the exhaust port , reducing the emission of hydrocarbons.
When there is negative pressure at the exhaust port the reed valve opens allowing secondary air to flow into the exhaust port.
The system also has an cut off valve that is controlled by the signals from the ECU.The cut off valve opens to allow the air to flow during idle and closes to cut off the flow when the moto is being driven.
However,if the coolant temperature is below the specified value the valve remains open and allows the air to flow into the exhaust pipe until the temperature becomes higher than the specified value.
Also if you unplug the AIS there is a mechanical function as well, where it drags in air when there is a vacum in the exhaust. e.g. on R1 and other yam bikes they disconnect the hoses and block the holes.

So Kev, from your experienced point of view, would you reccomend the xtx's to have the ais disconnecter or not? because this very issue has been bouncing back and forth, amongst many people. PDQ Dyno said it makes no difference and its ok to have it d/cctd while someone else said its worth having it connected. Whats your idea on this?

If you are running with after market pipes, there would be no advantage in running a secondary air system to burn hydrocarbons. Because there is no Caterlistic converters.

The way the AIS is set up, it is only for emission control & should have no effect on the running of the bike unless you are running with STD Pipes.

Something I was thinking about, if you block off the pipe from the airbox to the AIS, if it would change the air pressure in the airbox. In theory as the AIS runs it will cause a lower depression in the airbox affecting the air pressure sensor, a flat spot as you crack the throttle. Would be an idea to get someone to try my thought in practice, on the Dyno. With the air pipe blocked then unblocked to see if it makes any difference.

If you are running STD pipes I would not disconnect the AIS. You need to heat up & burn off the Cat for the exhaust to run correctly.

Im sure johnny has has run his bike on the dyno with and without the AIS ,I cant remember what his post was on the outcome,Im sure there was no benifit eitherway though.

Did he block off the air pipe from the airbox to the AIS or did he just unplug it?

great tip easy to do very effective.

I blocked mine and removed the plug and it felt like I had an improvement. it was around the same time I removed my baffles and cats from the std pipes (see my budget standard pipes uncorking).

Im onto a new project xtr now and was wondering how you would go plugging the airbox and totally removing the pipes and AIS assembly altogether? I could just make up a little plate to go over the hole on the head.

surely all that rubbish wouldnt be needed if your disabling the system.

I plan on running aftermarket headers with no balance pipe and uncatted powerpipes. Ill be riding it overseas where theres no emission hassles and I can have it dynoed here before I send it.

so what do you think Kev and me mates? just remove everything and plate the hole?

No problem to block off the hole with a plate.

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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 /
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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

Please send to this post new pictures of AIS removal!!!