[quote=JMo;75459]If you add more air, then the EFi will correspondingly add more fuel to keep the air/fuel ratio the same (I believe the optimum is around 14:1) for correct combustion and therefore yes, if you increase the airflow by a certain percentage, then you can expect the fuel consumption to go up by a certain amount too... The optimum A;F ratio for the XT in power & fuel economy is around 13:1, having a the XT motor running at 14:1 may be good for emission control but this does not mean it is the best air/fuel ratio.

Kev - to clarify, the new OTR part simply replaces the original and fits over the same aperture in the top of the airbox, it's not a second intake - it just scavenges from under the seat area rather than from directly behind the cylinder... I am a little confused, if you are removing the standard intake & replacing it with a new intake in the same postion how does it change the intake point from behind the cylinder to under the seat. Going by the picture from OTR I can't see how it will make any difference unless they are not showing all the parts to be fitted & saying it is a stage two is well off the point, a stage 2 intake would mean there would be two intakes one would think.

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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