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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 :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! |
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: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? |
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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!
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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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99% of dyno tuners do not map below 2000rpm, I have re-mapped my fuel map from 1200rpm to 7200rpm, my bike has a good A/F ratio below 2000rpm & can idle alot lower then the standard Yamaha fuel map without cutting out. |
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Ah, I see... yeah. I haven't had time to lately to ride and build up a map. Should hopefully get a ride in tomorrow if the weather is nice. It's a shame theres no way of hooking up the autotune to a data logger. I can see the AFR in the PCV Software while setup at home but thats about it. I have been tempted to get an AFR gauge though and wire in to my wideband sensor. |
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http://www.dynojetwb2.com/ |
Yeah, I kinda wish I had of done now.
However, what I have noticed, is that without a switch, the autotune wont make any adjustments on the fly, nothing will change untill I go in to accept the trims! If I had a switch, I could set it to sample and build and adjust the map constantly, so I'll look into that later :032: |
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Used an old one off an old triumph vitesse. You have mail by the way. |
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There is one thing about the kev fuel mod I have not fully understood:
Does it set the air temp to a fixed setting, or does it take the air temp reading and remove an offset? The latter would mean that one setting could be used regardless of the weather you are riding in, the first would mean that you must manually adjust the fuel mod knob depending on the air temperature when riding. |
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the Kev fuel mod takes off a % from the temp reported by the sensor. Meaning it is even more flexible than just removing a fixed offset. |
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The kev fuel mod is turning out a more interesting mod for me than a PCIII, especially if it can help some at low revs also for 07 ->, which is still a questionmark. |
You can see how it adjust the A/F ratio here.
http://www.youtube.com/watch?v=glkdBO8aZm0&feature=channel http://www.youtube.com/watch?v=0OHzpRrZMnA&feature=channel My fuel mod self adjusts for all weather conditions as it is wired in series. |
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Thanks Kev!
Just installed the Kev mod. It was really easy to install, really easy to make and it actually gives me the control I needed, not to mention that it cost me 6� to make and even make it neatly (had everything else handy except the box and the resistor).
Current setting is at -5C, but I think the correct one will be around 3-4. I can report the end result here if someone is interested. I also noticed that I have the 5VK-8591A-00 ecu, so I guess surging will never be completely gone. However, the Kev mod and DNA stage 1 has already made the bike a lot better. Next step is dna stage 2 and starting to hunt for the 5VK-8591A-01 ecu. |
Well done mate, thanks for the feed back.
The 01 ECU is money well spent, I have personally paid for 2 of them myself. You cannot use a second hand one as once it has been code to a bike it cannot be swapped over, I know I have a spare one lying on my bench right now I think I will be using it as a door stop. Use this part number when buying the 01 ECU & it will cost half the normal cost. 90891-30032 |
what is final conclusion on this Kev mod ?
first, is it supposed to work with o2 sensor or without ? btw, why should o2 sensor be removed ? second, is it supposed to be mounted only on airtemp sensor or on all 4 sensors (the other temperature sensor, air pressure etc. - i cannot recall all of them) ? i forgot: i have xt660r - 2007. |
[quote=mnb;139735]what is final conclusion on this Kev mod ?
I will let everyone else pass their comments for that question.
first, is it supposed to work with o2 sensor or without ? With O2 sensor connected on your 07. btw, why should o2 sensor be removed ? So we can control the closed loop circuit for full tunning, but the 07/10 XT does not allow to take full control of the closed loop circuit, we are waiting for a new O2 sensor mod, we hope to have a O2 mod soon. second, is it supposed to be mounted only on airtemp sensor or on all 4 sensors (the other temperature sensor, air pressure etc. - i cannot recall all of them) ? You only fit it to the air temp sender. i forgot: i have xt660r - 2007. |
tnx
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Thanks Kev, fitted my mod and fork spacers yesterday, measured the bars before/after and they now sit 25mm higher when freestanding upright :) I hadn't noticed much surging however I had only done 140km's since new in the past week without any slow traffic riding.
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How much would You Kev recommend to lower the air temperature on '07 model with aftermarket exhausts, removed snorkel and drilled holes ?
What are (in general) possible side effects of using this mod - instead of powercommander or similar ? How can one tell if his bike is tunned well with this mod ? By reading the spark plug ? If so, how long has the bike to be ridden, and in what mode ? |
[quote=mnb;140811]How much would You Kev recommend to lower the air temperature on '07 model with aftermarket exhausts, removed snorkel and drilled holes ?
You can go as low as -20 from the actual dash reading.
What are (in general) possible side effects of using this mod - instead of powercommander or similar ? No side effects at all, with a 100% proven track record over 4 years. A Power Commander is always my recommended fuelling device, with a custom made fuel map if you have the funds. How can one tell if his bike is tunned well with this mod ? By reading the spark plug ? If so, how long has the bike to be ridden, and in what mode. All the adjusting information is on the disk that comes with the fuel mod. Otherwise adjust the mod to find the smoothest ride if you made your own. |
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hi kev im mario and i own an xt660x 2007 model. previos owner have fitted the fuel mod but still surging a little bit on low revs maybe it because it has a high speed gear box if i change front sproket will it help make it a bit smaller
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My fuel mod will increase the fueling, with my fuel mod fitted to a 2007 XT660 > with O2 sensor it will reduce the surging but not eliminate it, you need to control the O2 sensor as well to get rid of the surging. To eliminate the surging on 2007 XTX XTR > you need to fit Dynojets PCV + O2 Optimizer or one of my fuel mods + one of my O2 eliminators. If you want to make your own O2 eliminator I explain how to do it & where to buy the parts from in the latest version of my mod book. A few other things to look at are worn rear sprocket rubbers & incorrectly adjust chain or worn chain & sprockets, also do my twist grip mod this will help with small throttle openings. |
2008 Xt660r
hi kev I own an xt660r 2008 model. I have Dna stage 1 and stage 2 airfilter. What size is fuel mod resistor, 1kohm or 10kohm? What is good resistor size my modification, Dna stage 1, stage 2 and stock exhausts. O2 eliminator?
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Clutch lever sensor mod ???
I herd from a Yamaha Mechainic that the clutch lever sensor wires can be bridged for a gain in acceleration or power responce ???
Sounds a bit odd. Perhaps someone with a dyno acn look into it ??? |
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Where can i buy one of kevs fuel mod for 2004 bike?
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scroll to the bottom of the page and click on the PayPal icon, once you are in the paypal website, there is a box when you can live a note and in that box please give Kev the exact model and year of manufacture and he will ship the correct mod to you. All Kev Mods come are now very plug and play, with no soldering required, you get a step by step guide on how to fit them and how to tune the fuelling knob. |
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