Hi to Pleiades & "The Guv'nor" and thanks both for the welcome.

Yep, the Kev Mod was already flagged up on my radar of mods to investigate further, but actually there's a bit more background to my bike purchase which I didn't put in my introduction for fear of making it too long-winded...

Both my other bikes have after-market exhausts fitted, and I'm up to speed with the need to sort the fuelling accordingly - I have a Power Commander (III USB) on the GSX1400 and the SEPST on the Harley, both of which can be tweaked on the laptop.

So when I was into my negotiations the salesman before buying the XTX, I made a point of asking what fuelling mods, if any, were on the bike to make the best of the Quill cans and K&N filter mods. He didn't know off-hand, so we went through the paperwork that came with the bike (lots of receipts, always a good sign when buying a secondhand bike).

Well, there in the pack, was a fitting instructions sheet for a Nitro-X module, which I'd never heard of before. As you well know, it was full of bullsh*t about "programming" the module, trying to make out it was some kind of Power Commander-type fuelling device. However, satisfied at that point that the fuelling had been sorted, I went ahead with the purchase, and in the meantime did some hunting on the web for info on the Nitro-X. It was universally slagged off as a load of crap on most forums (always by those who had never tried it, of course!) and the rare occasions when someone who HAD tried it and had some success spoke up in its defence, themselves just got slagged off! Needless to say, I hadn't discovered xt660.com at that point!

Anyway, I bought the bike, and very quickly discovered the fuelling glitches at the low end (there were no issues when I was on the gas a bit more). So, I decided to check the current setting on the Nitro-X and have a play with tweaking it up and down a bit. But I quickly discovered there wasn't even one fitted!

Well, long story short and all that, the dealer agreed to get said Nitro-X for me free-of-charge 'cos it should've been on there as part of the deal, and I duly collected this just two days ago and plan to fit it this weekend. Since it basically works on exactly the same principle as the Kev Mod, I'll give it a whirl and see what it can do for the fuelling. If it's no good, then I'll probably go for the Kev Mod.

I know a Power Commander would probably do a much better job, however I'm a bit reluctant to spend �350 on a PC-V (which is over 10% of the price I paid for the bike!) when it's not actually running that badly anyway at the moment.

This morning I measured the resistances of the 15 different settings on the Nitro-X; it increases in nice steady increments from 1.25 k-ohm to 6.83 k-ohm. (NB: isn't the Kev Mod a 1.0 k-ohm pot?) Anyway - more of that later when I've tried it out.

I've also tried various mods with the snorkel; with it fitted as standard, with it removed; and with it modified by shortening it, in two stages. I can post some pictures of my attempts if you're interested. My local Yamaha dealer technician told me removing the snorkel would make the surge problem worse, but having tried it, I beg to differ; it was the first shortening mod that was worst. In other respects he knew his sh*t, it was his recommendation to increase the TPS.

A bit later, I also want to try the AIS-blocking mod which I've just read about on this forum - sounds similar to blocking off the PAIRS system on my GSX1400. And maybe after that I might go for the DNA Stage 2 airbox mod.

Anyway guys, better wind this up, it's turning into War & Peace!
Thanks again and look forward to exchanging more info.

Cheers!
Dave.

p.s. Not being a "Supporter" yet (gimme a chance!) there are a few links I can't access, including the ones showing how the Kev Mod is fitted. So is the IAT sensor connected in series with the variable pot, or does the pot replace the IAT sensor? Just wondered because it might be nice to retain the ability to sense the change in ambient temperature as well as off-setting the zero, rather than just having a fixed offset as with the Nitro-X. That may also explain the difference in resistance values?