Cold air / dense air / winter temps running leaner etc.....is, I think, the basis of the mod's con The mod kids the ecu into thinking it's colder than it is so the ecu,by default programming, chucks in more gas to compensate, to richen the mixture which is a good thing when running straight through / limited baffled pipes and certainly a faster drawing air filter. Some car types have fitted pretty much the same device but it's a switch over system on the dashboard. I'm almost sure that's the logic of it.

Hi there i've tried all settings and find it makes no difference i have kev mod, O2 controller, stage 1&2, snorkel removed race cans baffles removed. The surging is driving me mad i don't know what to do next, do you have any suggestions?
New cush drives made no difference. Confused..

I'm a bit of a new kid on the block with these, and there are more knowledgeable folk on here, but to smooth mine out I followed the advice in the threads below. My TPS was at 15 so I left it. But I did adjust the CO to 15 as shown in the video. Also block off your AIS as described in the thread.

One other thing, I spent about an hour thoroughly cleaning my filthy chain with a small brush and lashings of oil and that made a big difference to the snatchy throttle response! Good luck and let us know how you get on.


https://www.xt660.com/showthread.php?t=56

https://www.xt660.com/showthread.php?t=11113

https://www.youtube.com/watch?v=3Mg3TaoXDFU

Good advice there...your drive chains condition/adjustment can make a big difference to your ride.

I used a toothbrush to clean mine when I first got the bike..with some degreaser.I had newspaper under the chain area(bike was on a paddock stand).
TBH I jet washed the whole area afterwards and used an airline the dry the chain/rollers.
I was amazed at how much crud came off/out of the chain.

Wurth chain lube is recommended.

How did you get on after replacing your chain & sprockets?