Sorry complete noob question here.

I've been looking around for modifying my xt660z Tenere '08.

Bike is completely stock as is, and the only mods I want to do are:

- Kev fuel mod
- o2 controller from Kev
and eventually:
- Single can exhaust

No filter mods.

I read a lot about the surging stopping when installing the O2 mod, but my bike doesn't surge at all, at least not that I notice.

As for the Kev fuel mod, the instructions say that with a Stage 1 filter the position should be set to 2 to 3 O'clock, this is already barely activated let alone when the stock filter is installed.

Now my question is: what benefits will I get from the O2 and Kev fuel mod with stock air filters and stock exhaust, and eventually with single can exhaust?

I believe that Kev's mods will not in themselves give any 'performance' gains but will 'correct' a few issues in the running that seem to affect these bikes.

His advice is all here..positive gains in the running can be made by changing the stock filters for ones that allow more air flow.Namely DNA ones. These in combination with a less restrictive/freer flowing exhaust will give you performance gains.

At least thats what I understand.HTH.

Both the open & closed loop AFR's are lean from the factory on these motors, the O2 controller will correct the AFR in real time in the closed loop, we use the Adjustable fuel mod to correct the open loop AFR's for a lean factory mapping & for the additions of hardware like free flow filters & pipe.

Correcting the lean AFR's in the open & closed loop does not give big gains in performance but it does give the bike a much more responsive & smoother motor. We get most of our HP gains from the added hard ware with the Air box & filter system giving the biggest HP & torque gains.

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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

Thanks Kev, thats what I wanted to hear!
I'll try the mods out in the near future

May I ask why you don�t want to change the air filters.

Of course you may.
It's actually not totally true. In the future I want to change the paper air filter for a foam one from OTR. But I will keep the snorkel in place.

The reason for this is that I am planning a RTW trip and I want to minimize the risk of the bike drowning when crossing rivers and stuff.

Thats why I dont want to do any extensive airfilter mods.

Safer to walk any unfamiliar water crossings before committing a fully laden bike into the unknown.
Hidden obstructions, soft river beds and water that comes up to bottom of your 'arris will all cause your bike to stop suddenly and usually results in a lung full of water for the bike.
The snorkel only sits approx. 50mm higher than an intake without, so any of the above will cause the bike to take a drink with the engine running.
If it stops abruptly, it's time to remove the spark plug before touching the starter to avoid the risk of a hydraulic con rod breakage, water won't compress.
Extreme precautions to take are an extension from the front of the snorkel with something similar to vacuum hose to a position above the bars, a system often employed when preparing a bike for the Wild and Woolly motocross where they send you through skips that are filled with water.