Ais mod works very well. Did mine last week and stops almost all the popping. Block the pipe off at the airbox and re-fit as per Kevs mod' guide. much better - I don't mind an odd pop but it was too much before.


The CO number can be different for each bike and can be anywhere from -128 to +128. I know what mine was originally and have increased the value by 20. I intend to put it back before using the new O2 eliminator.

Made my own Kev mod with a 1k ohm resistor from Maplin. Total cost incl' housing box, knob and wiring was less than �5. Sometimes I think it works and some days not ? I believe you need to control the O2 sensor (not eliminate it) as this senses oxygen level and adjusts at low throttle openings whatever else you do so overrides everything else. I may not be exactly correct but I've thought i'd cured it a couple of times only for it to come back.

I also think that somedays being more confident (sub consciously ?) and opening the throttle earlier and slightly harder going into the middle of a corner might make a difference. Also and I know I've said it before but chain slack and loose cush drive rubbers makes more difference than you'd believe. Several other people have pointed this out to me in the couple of days since I joined the forum.

Good luck.

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White 2009 XTX. MTC Cans, K&N filter stage 1, DNA Stage 2, Kev mod, Co value +25 from std, New Kev O2 Controller, Dunlop Sportmax Mutant.
Montesa 4RT -best bike I've ever had by far !

3 teenage sons, 9 radio control models, Beta Evo 125, 6 push bikes - garage too small ! Not enough time to ride th' XT !

The older I get the better I used to be !!!