Ignore last post !!!!!!!!!!! in my excitement to get the bike back together the run I went on was minus the side cover of the airfilter !!!! :coat::iamwithstupid::iamwithstupid::iamwithstupid :

Therefore after total stoopidity has made way for correct proceedure I am very happy with what the bike now goes like
Im off now to boil my head

Hi being a newbie I would like to do the AIS block and Kevs fuel mod. Have read some of the threads on this site but they spread to 112 pages! I have a Haynes manual coming in the post to help with the AIS block but not sure how to proceed with the fuel mod. Do I need to buy bits from this site? Also I have posted a note about my noisy engine, it maybe normal as I have no previous experience of this engine. I had a F650GS which was much quieter and smoother. The noise occurs constantly when on the gas in 3, 4 and top gear. Stops when off the gas. Sounds to me like valve gear whine at top end but could be gears? Any XTZ owners in Kent I could visit so they can test ride my bike?
Ta
Andrew

My fuel mods can be bought from the forums front page from this link click on the PayPal sign to buy one.

http://www.xt660.com/site/node/136

If you want a 2012 O2 Controller they can be bought from this link.

http://www.ebay.com.au/itm/Yamaha-XT660X-XT660R-XT660Z-XTX-XTR-XTZ-O2-Controller-/130882729808?pt=AU_Motorcycle_Parts_Accessories&ha sh=item1e7937f750

Got all the dna stage filters and lv cans fitted. Anyway, the temp has finally dipped below thirty degrees so i thought i would adjust the fuel mod, as i had previously read that the settings differ according to temp.
However, others have reported significant gains with the mod, but i only really noticed very negligible gains with this mod in the off position, compared to when set to any other position, furthermore, the gains were so small i could in no way tell which point to set the dial.

The way i tested was to lock the throttle at 5000rpm whilst in neutral and then just play with the dial. There was a indeed a difference between on and off. Clearly indicated on the rpm meter thingy dingy. And besides that when set to all the way left the engine seemed to raw but cannot be sure if i imagined that.

I changed the dial when riding that was totally beyond my sensibilities. This may well be down to the fact i never go over 90km.

I ve had the mod fitted about six months and to be honest i felt the same way when i bought it. But did nt want to post on the forum through fear of offending or i was expecting too much.

So basically any feedback would be greatly appreciated.

Am i right in Saying that for someone like me who rides slowly, mainly because i have to but i have gotten used to it. That the o2 sensor would make more... Sense.
Ps thanks guys i get hours of enjoyment from reading through all your experiences.

The Fuel mod corrects a lean A/f ratio, the difference between the mod been turned off & fully adjusted is approx. 1 to 2HP, I made the mod so it can not be over adjusted & can only adjust in a safe A/F range, as in the past I had riders over fuelling the motor which cause problems so I had to re-design the fuel mod.

A fuel mod including a Power Commander is used to correct the A/F ratio it is not a performance mod, performance mods is usually hardware like DNA filters & pipes which make the bike run leaner, then a fuel mod is needed to correct the lean A/F ratio to get the best results from fitting the hardware mods.

The O2 controller mod is there to give you better throttle control, to reduce the surging when on the cruise, allows the ride to ride slower in the same gear.

Thank you for quick reply, so the fuel mod basically allows the rider to get the most from any after market performance modifications, conversely, i had always looked at it completely the opposite to that. Regarding the settings, the higher the dial the greater air mixture and possible performance benefit.

By the way just ordered an o2 controller. I ve read everyones opinion and its just what i need.

Thanks mate all packed up ready for posting in the morning.

95% of riders think a Power Commander or fuel mod is performance device, in real life they don't show any great performance gains, they are there to protect your motor & to make sure the A/F ratio is set so you get the optimum performance from the intake & exhaust mods you added or correct the A/F ratio on a standard bike for optimum performance.

A couple of weeks ago, i received post from Germany & Australia. My kevmod en stage 1&2 dna filters had arrived! Installation of the parts was easy, and didn't took long. I turned the mod at 4 o clock, and went for a test drive. Nice engine sound now, and the bike feels a lot more alive at higher revs. I am happy with the results, now i am curieus if it takes more mpg...

My bike is a 2012 XTZ abs model.

Thnx for all the provided information, an keep up the good work!

Greetz,

Henk

Okay, first impression after the modification. DNA stage 1 + 2; O2 controler and Kev mod. Installation is easy. Quick response on questions. Thanks Kevin!!
After 20 kilometers: Big smile :thumbsup[1]:on my face. I notice a better gasresponse at higher revs. Smooth and stable driving under 3000 rpm. Overall worth the money. I only need to see what the modification does to the tires:toothy10: and fuelconsumption. But that will become clear this weekend in Germany after 3 days in the Westerwald. I will report after this weekend.

Mods have arrived.
 

Co2 & fuel mod has arrived, many thanks Kev, I have just fitted the Yamaha Akrapovic to the bike so iam going to fit my mods in stages. Co2 mod all plugged in and to be honest the bike has changed, nice on tick over, revs cleaner and very little popping, will ride it tomorrow then fit the fuel mod. Filters will be ordered next week then fitted.

Thanks again

Paul