Hi guys!

Think I am in the right department, it is about mods.

Need some advice.
Recently bought my Zed model and it is equipped with some tuning devices.
Problem is that I don�t know very much about that stuff. Must learn of course.







Seller told me I could keep the setup as it is even if I of some reason changed
back to original airfilter and silencers. Now I want to replace one of the
silencers with a toolbox and do the tidy tail mod as well.
I have 2 LeoVince SBK�s mounted today. Don�t want to loose any of the power I
have today so my question is, Is it sufficient to keep one of the Leo�s or must
I get another single silencer with bigger outlet replacing the 2?
In last case, what diameter on the outlet?





Thanks,
Tomas

How is the Auto Tune connected does it have a 2nd O2 sensor bung with the Auto Tunes wideband sensor + the OEM O2 sensor still connected? Meaning if correctly installed you should have 2 X O2 sensors installed on the exhaust header, one for the Auto Tune & the other for the bike.

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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

Oh, don�t know that so I have to check. I know how the O2 sensor for Autotune looks like
by looking at this picture. But how does the other one look/mounted, they can�t be at the same place I guess?

You need two O2 sensors connected at all times, one Auto Tune & one OEM O2 senor with a O2 optimizer or one of my O2 controllers connected to the OEM O2 sensor to map these 660 correctly with a Auto Tune.

If there is only one Auto Tune O2 sensor & the OEM O2 sensor has been removed you will not be able to map the A/F ratio correctly in the closed loop areas, you will also need to have the AIS blocked off all the time while running the Auto Tune.

__________________
Click here to join the XT Supporter's scheme

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

Hi Kev!

I got intouch with the seller of the bike asking about the O2 sensors.
He says there is only the Autotunes wideband sensors mounted on the header where the OEM used to be.
He is pretty sure he got the advice from OTR to replace original against the Autotune one and mount
an O2 sensor eliminator on the XT connector which goes to ECU to eliminate the stock O2 sensor.
To the last, the AIS is blocked in a rubber hose belonging to the AIS system.

So, question remains. Can I take one silencer away without loosing power or must I buy another single
silencer with bigger outlet?

Regards,
Tomas

Kev can handle all your fuelling questions but FWIW I just removed one of my Twin Barrett pipes to go with the single and tool tube and it runs away better and sounds awesome as well.

Just remember the XT660Z isn't a twin system, it's has two outlets on the muffler but it's still a single essentially.

Matt.