The Kev Mod
 

This is a fuelling fix deviced and provided by KEV who has kindly shared this great mod together with pictures and step-by-step guide.

It's an essential must have mod, Enjoy and send your praises to Kev by pm.

Thanks Kev from all of us :041: :041: :041:

Can be bought by PM Kev, payment by PayPal

Kev Mod explained
 

I have been asked this question a few times now & will make a post for it, what is the Kev Fuel mod, how does it work & why did you make it.


Basically the XT660 has a fuel injection set up to run very lean for emission control & this causes a slow running condition on our bikes & makes it uncomfortable to ride at low speeds.

What members have been doing is to richen up the fuel mixture by fit fuelling devices. There are quite a few now on the market, but in the early days 2004 there was none for sale for our bikes, so I made up a very basic one to fit my bike & never intended to sell it, it only fits 04 to 10 models. I was then asked by the forum owner to make them avaliable to members who also had the same fueling problem. So I sent 4 Mods over seas for inderpendant testing in 3 countries & the results came back all postive. The mod has had 4 upgrades over the past 2 years to it's present state. The mods are sold with a 30 day money back guarantee, if don't like it send it back & I will give you back your money. I have sold over 400 fuel mods so far with 99% positive feed back.

How it works is there are a few input sensors to the fuel injection system which tell the engine management the environment conditions, like how cold is the motor, what's the air pressure, what is the air temperature, where is the throttle angle.

What I did is to make up a device that connected to the air temperature sender which sends a false signal to the engine computer. I can adjust any degree I want to make the Engine ECU in to thinking that the air temp is colder then it really is & in doing this the bike thinks its cold so richens up the fuel mixture across the whole fuel map range. There is a CO1 setting in our dash which should be set 10 to 15 above the standard setting so make sure you have done this, what I found on the Dyno that is the CO1 does not adjust the fuel mixture once the throttle has opened it then runs on a map & is cancelled. So adjusting the CO1 will only adjust the fuel mixture at part throttle & not across the whole fuel map range.

As I say this is a very basic device & it uses the Yamaha fuel map, other devices like Power Commander can modify the Yamaha fuel map every 250RPM & is far better device but cost over 10 times more. One thing to remember not even the Power Commander can completely remove the surging but these fuel device do make a improvement to the slow riding conditions.

I keep making these mods to help riders that want an improvement from standard but can not afford a Power Commander & I try to keep the costs down to more of a service then a profit.

My mod is tried & tested on the Dyno with before & after results.

http://www.xt660.com/showpost.php?p=11400&postcount=79

http://xt660.com/showthread.php?t=3215

The story of the Kev Fuel Mod when I first joined the forum.

http://xt660.com/showthread.php?t=55

Other fuelling devices.

Power Commander. http://www.powercommander.com/powerc...b/default.aspx
Rapid Bike. http://rapidbike.dimsport.com/infoprodotto.php?DS=f585e9b5da35e34fc55c5b1c8df558 4c&lang=it
SFI control. http://www.staintune.com.au/sfi_yamaha_xtx660.htm
Dynateck FI Controler. http://www.off-the-road.de/xt660_xt-power.html?&L=1
Remus Powerixer. http://www.remus.at/powerizer/
http://www.britnett-carver.co.uk/tro...prods/277.html
Kev Fuel Mod. http://search.ebay.com.au/xt660x_W0QQfromZR40 >Will only fit 2004 to 2006 models, 2007 model mod can be bought by Pm. http://www.xt660.com/showthread.php?p=46222#post46222
G.P.R. http://www.gpr.it/prodotti.php?id=14

Hope I have answered your questions.

Cheers
Kev

Some more info on my fuel mod if anyone is interested.

http://www.youtube.com/watch?v=glkdBO8aZm0&feature=channel

http://www.youtube.com/watch?v=0OHzpRrZMnA&feature=channel

Hi Kev, I have read a lot of what was written on the subject but it is still not 100% if it could help me with my very specific need. I'm fine...I mean I tolerate the bikes performance for most of its range but I'm not happy when over 120 and need to overtake. Cars are just fine if they are not speeding but it aggravates when I need to overtake buses or lorries specially going uphill. To make this even more tricky I like to favor consumption. So the question is:

Can I with your mod, while ridding gain a little boost for overtaking and then switch it off afterwards?

Cheers!

I believe this kind of set up can give a little temporary boost if required http://www.nitrous.info/

:pjrlaugh_61OD3G:

Sorry. I couldn't resist.

Better still.....
http://i85.photobucket.com/albums/k4.../Random/TB.jpg

Funny sense of humor they have in Chesterfield :072:

Back to the questions that you haven't answered. Could a richer mixture be set while riding? Would that help over 120km/h?

Yes the fuel mixture is increase over the whole rev range, from idle to 7200rpm.

I can can data log the A/F ratio if you want to see to the difference at 4400rpm.

Thanks for the answer Kev. I'm a little short on money now but will get some of your mods in the near future. Cheers!

Kev,

I got to ask, in your second video, its only idling at around 1200? whys that?