hi iv fitted my mtc can 660x
it didn't seem to run as nice so as a quick fix till iv gone the better route remap fueling etc. brought this thing that plugs into lambda plug a base setting thing recomemded for after market cans etc after doing a 18 mile trip its definatly running richer as my jacket stinks exhaust fumes.
so I got home crimped the pipe ais I think and removed snorkel. will try this. failing that running to rich can cause the same damage as to lean cant it ?
mtc said just fit and ride ? but it was awfull if honest
small HELP lol

Those plug in O2 sensor eliminators don't work and is probably why it's now over rich. The ECU needs to receive more complex information than what you get from a simple resistor bridging the connections (which is all these plugs are). Also the heater element connections are bridged too, so the O2 sensor's heater doesn't operate, which will in a fairly short space of time knacker the O2 sensor completely.

Remove it and reconnect the O2 sensor plug.

Quite why fitting the MTC cans made it feel worse, I'm not sure? Could you explain how it felt worse?


Not really. Running rich will just spoil performance, cost you a fortune in fuel and the motor will get particularly "boggy" when warm and stall more easily in hot weather. In rare cases, a very rich mixture can cause "bore wash", where excess fuel washes around the piston rings causing excessive engine wear and the chances of fuel getting into the oil, but it does have to be so rich that neat petrol is coming out the exhaust! Bore wash normally occurs when an injector gets stuck open and you really notice the fuel consumption drop off, sometimes into single figures!

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Andy please ask Kev about his fuel mod / 02 eliminators they have a 100% satisfaction rate in this forum.

will be getting kevs fuel mod for sure.
the cans made it feel lean very hesitant on pull away and it stalled cold and warm when approaching junctions. had to keep blipping throttle

You can help the stalling simply Andy, just look at the throttle body and locate the idleing screw, increase the tickover a little bit ideally between 1450-1550 rpm, this will help keep a small flow of fuel when you shut the throttle, to display the rev counter mode follow this link: http://www.xt660.com/showthread.php?...=Co+adjustment

+1 the plug in resistor O2 eliminators don't work on any XT660, when we proved this a few years ago Dynojet removed all their O2 eliminators off the market.

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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