Hi,

Just fitted an OTR Akrapovic exhaust.
While I was at it I completly removed the AIS and I also have a Lambda bypass plug.

when testing the bike i noticed the following.

When giving it some throttle the bike cuts out for a second then shoots off.
this happens every time i give it a good amount of throttle.

I've got a feeling that the bike is too lean, am I right???

1 more thing.

I also tried fitting the lambda plug back to the lambda sensor,
bike cut out completely and gave me error 30...

first thing turn ur tick over up to 1500rpm.

have u changed the co2 readout?


have u fitted any air filters?

have u fitted a fuelling mod?

I'm not an expert but you have allow the exhaust fumes exit the engine easier now u need to change or modify the fuelling to suit.

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Plough on

The O2 resistor type eliminators do not work on a XT660's the A/F ratio will be all over the place with one connected. I see you do chip tunning for cars do have you any experance with Yamaha or Kawasiki ECU's?

By the way I posted off the fuel mod for you this morning. On your 2008 with O2 sensor you will need one Dyno Jets O2 Optimizers or one of my O2 controllers to control the closed loop circuit otherwise you will never get the A/F ratio right in the closed loop, controlling the closed loop A/F ratio will smoothen the ride out quite a bit.

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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