Hi all
Does anyone know if it's OK to fit the fuel mod without fitting the 02 controller. I will buy one but not for a few weeks. I have just added aftermarket cans done the air box snorkel mod added a K&N air filter and the keys fuel mod should be here next week so want to fit it straight away. But will not have the 02 controller for a few weeks. Title should say kevs fuel mod not blood keys predictive crap

Ive got pretty much the same set up as you & the mod made a big difference. haven't got round to getting the O2 mod yet but its on my list

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Blue XT660X - MTC pipes - Kev Mod - Stage 1 - Puig screen

The kevs fuel mod does not work without the 02 sensor fitted if you have the 2007 bike on with the sensor on the headers

Not my experience and I have the said 07 with a Lamba.

I asked kev 3 days ago who makes them as I just bought the fuel mod for my 07 xt660r and I asked him is it ok to fit the fuel mod before the 02 controller turns up as not bought it yet buying it this week. And he said no you have to fit the 02 controller with the fuel mod or the OEM 02 sensor on the bike stops the fuel mod from doing its job And he is the one that makes them ? He said if you fit the fuel mod the OEM 02 sensor will just take the extra fuel away that the fuel mod adds so you have to fit both mods for it to work right which make perfect sense.here is his reply to me asking the question......

‘You can fit the fuel mod but the O2 sensor will just take the fuel away that you add, yes you need both mods to work together’

To clear things up & give a more detailed explanation but wont go right into depth, the adjustable fuel mod & O2 controller for a XT660 with O2 sensor target different areas of the fuel injection system.

The Adjustable fuel mod will alter/correct the open loop mapping under accelerations & higher rev ranges, it corrects the AFR for hardware that has been fitted like free flow pipes & free flow air filters & lean AFR's in the open loop mapping.

The O2 sensor closed loop circuit only works at part throttles when your throttle is steady & will remove any fuel added by the adjustable fuel mod in this area only at part throttles, as soon as you start to accelerate the ECU switches to the open loop & the Fuel mod will come into play again.

When we fit a Fuel mod + O2 controller the O2 controller corrects that lean AFR in the closed loop at part throttles the whole throttle AFR range open & closed loops are nice & smooth with a rich AFR.

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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

I was quite pleased with my fuelling mod but not half as much as the Power Commander I currently run.