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Performance Modifications & Enhancements Engine, Fuelling & Throttle performance mods

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  #1  
Old 20-05-06, 14:24
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CaptMoto CaptMoto is offline
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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

Can be bought by PM Kev, payment by PayPal

Last edited by CaptMoto; 31-07-12 at 01:53.
  #2  
Old 23-09-07, 00:35
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Kev Kev is online now
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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
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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a new 2012 KTM990SMR. 130.47 rear wheel HP, mod list below

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

Last edited by Kev; 26-05-10 at 04:11.
  #3  
Old 26-05-10, 04:12
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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
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CLICK HERE ----- For the full index of XT660 Mods


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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a new 2012 KTM990SMR. 130.47 rear wheel HP, mod list below

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946
  #4  
Old 02-06-10, 12:54
zensurf zensurf is offline
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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!
  #5  
Old 02-06-10, 20:08
SelinaXC SelinaXC is offline
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Quote:
Originally Posted by zensurf View Post
while ridding gain a little boost for overtaking and then switch it off afterwards?
I believe this kind of set up can give a little temporary boost if required http://www.nitrous.info/



Sorry. I couldn't resist.
  #6  
Old 02-06-10, 20:09
Onanist Onanist is offline
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Better still.....
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  #7  
Old 03-06-10, 11:09
zensurf zensurf is offline
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Funny sense of humor they have in Chesterfield

Back to the questions that you haven't answered. Could a richer mixture be set while riding? Would that help over 120km/h?
  #8  
Old 03-06-10, 12:16
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Kev Kev is online now
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Quote:
Originally Posted by zensurf View Post
Funny sense of humor they have in Chesterfield

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.
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CLICK HERE ----- For the full index of XT660 Mods


Click here to join the XT Supporter's scheme

Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a new 2012 KTM990SMR. 130.47 rear wheel HP, mod list below

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946
  #9  
Old 05-06-10, 12:45
zensurf zensurf is offline
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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!
  #10  
Old 05-06-10, 13:46
dazmatic dazmatic is offline
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Kev,

I got to ask, in your second video, its only idling at around 1200? whys that?
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CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.
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