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.: XT660.com - The #1 XT660 Resource :. ( https://www.xt660.com/index.php)
-   Fuelling and Intake ( https://www.xt660.com/forumdisplay.php?f=207)
-   -   Fuelling Fix ( https://www.xt660.com/showthread.php?t=55)

weeksy 05-05-09 23:56
Already have cans mate, filters waiting for payday. Seems I misunderstood parts though. Not to worry.

uncle ricky 20-08-09 16:27
Quote:
Originally Posted by koma (Post 87271)
Hi,
I am new Yamaha 08. Tenere owner and this is my first contact with Yamaha. I ride cross ktm, I had Vstrom before this bike and of course this bike is without power after 1000cc bikes. But I read all this modification and I today put two new open pipes. From first day ( with original cans) it popped a lot when I turn off throtle, on low rpm. Why? Is it bad air/fuel mix? I think It is because it is rich mix, and all I read here with CO1 corection, we make richer mix?!
So what I have to do ?
To make air box modification, put K&N filters?
What CO corection to make?
I read about popping that it is not blocked AIS pipe?! What is AIS pipe?
Do I need to move to corect value TPS sensore and what is good TPS number?




Thanks a lot, I hope that I would like this bike.
Thanks a lot.

No reply to this thread ? I have a 09 Tenere and was going to carry out the mods above, I will wait for a reply 1st

Rick

dazmatic 20-08-09 17:12
Quote:
Originally Posted by uncle ricky (Post 103593)
No reply to this thread ? I have a 09 Tenere and was going to carry out the mods above, I will wait for a reply 1st

Rick
ok, I'm not all to hot on the Tenere, I'm aware they've got a different air box but I know there's still stage 2 filters for them.

That popping is 'backfire' It's when unburnt fuel in the exhaust system meets fresh air the the temperature causes it to burn rapidly in the exhaust. The AIS or Air Induction System is a system where a pipe from the airbox goes into the exhaust side of the engines head and on throttle closing a little valve opens and allows cool air from the airbox directly into the exhaust burning any unburnt fuel to help keep the emissions down.

It's basically a built in backfire system.

Stage 1 and 2 filters will add more HP

Adjusting the CO1 levels up is purely to help smooth out the engine running at small throttle openings (between 16 and 18 on the Throttle position sensor) I believe.

If you've got aftermarket cans then the AIS can be blocked to stop backfire

Generally, I'm led to believe that any value between 15 and 18 is ok for the TPS, the higher the value the richer the mixure will be. The TPS needs to be set with the throttle closed.

From Kevs understanding the best setting he found was 16.

chas 26-09-09 14:35
engine stalling
 
My 06 660x stalled mid way thru a bend and when i let the clutch out it spat me off.HELP me fix this problem PLZ:(.THANX KEV .:):)

Kev 27-09-09 05:13
Quote:
Originally Posted by chas (Post 106528)
My 06 660x stalled mid way thru a bend and when i let the clutch out it spat me off.HELP me fix this problem PLZ:(
First of all welcome.

I have put as much info on all XT660's in one section call the Modification Index. Page to the very bottom of this thread & you will find the info you need.

yamaha 28-09-09 12:03
hello, i put the stock pipes on my xtx with the stage 1 filter, where the C01 number i put ? stock is number 7

thank you

CaptMoto 28-09-09 13:16
try increment of 5 and see which is the set up that suits you, it is a matter of trial an error for all of us, as no two bikes behave in the same way.

Good luck

Kev 28-09-09 13:16
Quote:
Originally Posted by yamaha (Post 106677)
hello, i put the stock pipes on my xtx with the stage 1 filter, where the C01 number i put ? stock is number 7

thank you
What year XTX?

yamaha 28-09-09 14:51
I put today on 12 the CO1 ;) its cool

year 2005 ;)

Kev 28-09-09 23:15
Quote:
Originally Posted by yamaha (Post 106687)
I put today on 12 the CO1 ;) its cool

year 2005 ;)
10 to 20 CO1 for a 05 model.

yamaha 29-09-09 10:57
i put on 15 and testing

thanks kev :D

yamaha 04-10-09 16:00
hello kev, now i put the leovince exaust, the number its 10 to 20 or more ?

now its on 11 to testing

thanks

PRW 11-03-10 00:11
Quote:
Originally Posted by JMC (Post 174)
DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY.

Step 1. Before turning the ignition on press and hold Select and Reset buttons, turn the ignition on and keep holding both buttons until you see the Diag screen appear.

Step 2. Press Select once to toggle to the CO MODE

Step 3. Press both Select and Reset together. Hold for about 3 seconds to enter co mode. The number displayed is the cylinder selected (genereric computer for all Yamahas) You need to select 1, Press select to scroll up and Reset to scroll down.

Step 4. Press both Select and Reset simultaneousley for a few seconds to see the setting for the selected cylinder. This number will be different on every bike and has no relationship to the mixture its just a number it can range from -128 to +128. Write down the number and keep it in a safe place in case you need to return to your original settings.

Step 5. Pressing select will increase the value (richen the mixture), pressing Reset will decrease it.

I initially increased my setting 5 digits from 10 to 15. This smoothed the bike out but still had a little surging. After reading what Alan and others have said it should be safe to increase your original setting by up to 10 digits. I will now adjust mine up another 3 to 18.

Step 6 To exit CO mode, turn off ignition.

Noticed benefits. The bike is now very smooth to ride and on my 1st adjustment took out almost all the surging/jerkiness. This has made the bike much easier to ride through corners where i can now get on the gas earlier in the corner increasing the mid corner speed.


More info can be found on the forum: fueling fix.
Some help please - when I did the above, the number was -5. I increased it to +5 (a change of 10) - is this correct?
cheers
Peter

CaptMoto 11-03-10 00:50
Quote:
Originally Posted by PRW (Post 123000)
Some help please - when I did the above, the number was -5. I increased it to +5 (a change of 10) - is this correct?
cheers
Peter
Yes, you can go up in increments of 10 until you find the ideal setting for your bike, keep checking the spark plug at every change, to see if it's too dry or too wet.

PRW 11-03-10 02:20
excellent, thanks for the info - by "too dry" or "too wet", what would I look for? I have the technical knowledge of a goldfish....

CaptMoto 11-03-10 05:00
Have a good read through that. in fact I'll make this a "sticky" in a new thread for the rest of the members to use as a reference

http://www.ngksparkplugs.com/tech_su...qs/faqread.asp

PRW 11-03-10 07:03
this site is brilliant - thanks!

Kev 11-03-10 09:35
You are safe to go up by 30, more then that & the bike will be to rich.

Just a reminder this CO adjustment is for idle & part throttle only, it does not adjust the fuelling once the throttle is past 19 on the Throttle Position Sender. To adjust the fuelling across the whole fuel range you need a fuelling device.

PRW 11-03-10 10:01
thanks Kev...
do you know anyone in Darwin who could do your fuel mod if I get it off Ebay? I wouldn't be able to do it myself.. (yes, I realise it is easy, but....!)
Also, the adjustment to the CO has sorted out 90% of the issues.

Adventure Boy 06-04-10 20:45
Was in the city allday today and the surging and harsh throttle responce was very much there and I felt the bike would be a pig offroad looked at the CO and it was at 11
I started increasing it by 5 at a time im now up to 41 an increase of 30 which ive read by Kev thats abouts as much as you can go the bike is better but still not as good as the XT660Z I had that was sooo much better
going to get a Kev mod next for sure

CaptMoto 06-04-10 22:13
Yes that can be a solution but please make sure you consult Kev fully as there are many items at play that determine surging and snatchy behaviour, the four main culprits usually are:

1) incorrect idle speed (tickover) which should be set between 1450 to 1500 rpm.

2) incorrect TPS angle, too close and it will shut the fuel prematurely, too open and it would flood the engine.

3) the least suspected one and often one of the main causes is: the level of wear in your rear hub dampers, otherwise known as cush drive rubbers, when they are worn they allow too much play and with that I would also check for a correct chain tension and wear of both chain and sprocket.

4) the one which nobody bothers to check is the side stand switch, if yours is mucky and dusty, it may causes it to stay in the open position or flick between open and close and makes the engine cut off automatically at random, so it's always worth keeping it clean and protected with WD40 or similar preserving lube.

Razerback 12-07-10 06:20
2009 Xt660r
 
Thought I would post my observations.
Just bought a new 2009 XTR.
No obvious surging but very jerky/lumpy? at low revs.
Factory CO 13
Increased CO to 20 - no change
Increased CO to 25 - much smoother
Experimented by 5's up to 40 with very slight changes and have settled on 38.

cca 11-09-10 15:17
My observations too (changing CO and effect on RPM at idle):
TPS 16 , CO 11 (from factory)
CO RPM idle
11 1240-1270
15 1240-1270 much healthier sound, smooth low end
18 1350-1390 less pops
19 1310-1350 less pops
21 1310-1350 no pops at all
For now, I left it at 18, planning to rise RPM up to 1400 and read plug for final decision.
And maybe changing TPS to 17.

williamtell 24-09-10 21:13
Effect of altitude on standard C01 setting
 
I have a 2008 XTR. The standard C01 setting on my particular bike is 12. I assume that this setting is based on the assumption that the bike will be run at sea level. I live at 1600m above sea level, should I reduce the C01 setting to compensate?
Also, I have had issues the engine stalling at idle speeds when trying to accelerate. Would lowering the C01 also remedy this issue?

gixxerjacko 24-09-10 22:25
Cutting out and running rough!
 
I have just done the hold select and reset thing on my XT660X and bumped the CO level from 6 to 15 and what a difference, no surging, no cutting out and much smoother running. How many people have sold the bike because of this problem or Yamaha agents made ripping owners off for a simple 60 second fix?

Cheers for the fix.:eusa_dance:

simon m 13-04-11 10:17
Free advice off likeminded individuals! Brilliant. Adjusted my xt sumo from 8 to 16. Stunning difference when plodding around town. This bike is perfect for 90% of the roads where i live on the isle of man. Wearing my boots out is the next issue.

bigTrev 15-04-11 16:30
Quote:
Originally Posted by JMC (Post 174)
DISCLAIMER: YOU DO THIS AT YOUR OWN RISK AND MAY VOID THE MANUFACTURERS WARRANTY.

Step 1. Before turning the ignition on press and hold Select and Reset buttons, turn the ignition on and keep holding both buttons until you see the Diag screen appear.

Step 2. Press Select once to toggle to the CO MODE

Step 3. Press both Select and Reset together. Hold for about 3 seconds to enter co mode. The number displayed is the cylinder selected (genereric computer for all Yamahas) You need to select 1, Press select to scroll up and Reset to scroll down.

Step 4. Press both Select and Reset simultaneousley for a few seconds to see the setting for the selected cylinder. This number will be different on every bike and has no relationship to the mixture its just a number it can range from -128 to +128. Write down the number and keep it in a safe place in case you need to return to your original settings.

Step 5. Pressing select will increase the value (richen the mixture), pressing Reset will decrease it.

I initially increased my setting 5 digits from 10 to 15. This smoothed the bike out but still had a little surging. After reading what Alan and others have said it should be safe to increase your original setting by up to 10 digits. I will now adjust mine up another 3 to 18.

Step 6 To exit CO mode, turn off ignition.

Noticed benefits. The bike is now very smooth to ride and on my 1st adjustment took out almost all the surging/jerkiness. This has made the bike much easier to ride through corners where i can now get on the gas earlier in the corner increasing the mid corner speed.


More info can be found on the forum: fueling fix.
Hi, can this fuelling fix be used on o7 xtx models with the exhaust sensor? deffo want try it as my bike is almost unrideable at speeds of 30mph and below.

Kev 15-04-11 23:33
Quote:
Originally Posted by bigTrev (Post 153803)
Hi, can this fuelling fix be used on o7 xtx models with the exhaust sensor? deffo want try it as my bike is almost unrideable at speeds of 30mph and below.
These XT's are very lean for emission control. Up your CO & fit one of my fuel mods, this will help with the surging. The CO can only adjust the fueling at part throttle, my fuel mod can adjust the fueling across the rev range.

bigTrev 16-04-11 20:46
Well i experimented today with the co level, standard setting was 13 so i upped to 19. didnt notice any difference, so upped again to 23 and still cant see any improvement. Next step, remove snorkle?? or "the Kev mod" or both?

Kev 17-04-11 00:54
Quote:
Originally Posted by bigTrev (Post 153864)
Well i experimented today with the co level, standard setting was 13 so i upped to 19. didnt notice any difference, so upped again to 23 and still cant see any improvement. Next step, remove snorkle?? or "the Kev mod" or both?
The results would differ depending on what ECU you have on your bike.

http://www.xt660.com/showthread.php?t=8546

bigTrev 17-04-11 19:51
its an 07 model, so i gather i will need a 2010 mod with 02 eliminator & a power commander. How much would these cost ? cheers

Kev 17-04-11 23:23
Quote:
Originally Posted by bigTrev (Post 153898)
its an 07 model, so i gather i will need a 2010 mod with 02 eliminator & a power commander. How much would these cost ? cheers
O2 eliminator

http://cgi.ebay.co.uk/XT660X-XT660R-XTX-XT660-O2-Eliminator-Yamaha-/130509780623?pt=AU_Motorcycle_Parts_Accessories&ha sh=item1e62fd368f

There are a few second hand PCIII running around from 150 Pounds upwards. Send simon-c a PM & he can give you a good price on a new one.

bigTrev 18-04-11 12:32
Thanks for the help Kev, I,ll have a think about getting these.

masgra 19-10-11 14:06
hi guys, does this CO mod work on the Ten? on my 09 Ten holding the buttons in and switching the ignition on only allows me to change Miles/Km and the Time :102:

Kev 19-10-11 23:30
Quote:
Originally Posted by masgra (Post 163689)
hi guys, does this CO mod work on the Ten? on my 09 Ten holding the buttons in and switching the ignition on only allows me to change Miles/Km and the Time :102:

Yes the new O2 eliminator does work on the Zed, you can't enter the dash throught the buttons on your Zed you need the Yamaha fault code read tool to do this.

XT660Z O2 mod installation instructions.

To download any of these links below copy & paste the links to a URL & click DOWNLOAD NOW wait for the counter to count down, then click DOWNLOAD file now save the files to a folder on your desktop.

http://www.4shared.com/document/S3SyRIeE/The_Kev_XT660Z_O2_Eliminator_M.html

Landton 09-11-12 07:17
I,am a little bit confused, is this without PC5 & much more. How come I only got 42hp with my mod 2-1 system, O2 optimizer, KN filter, PC5?

http://www.sporthoj.com/forum/attach...0&d=1344283504 My dyno

Kev 09-11-12 10:41
I never look at one off dyno runs as they don't really tell you much as every Dyno in the world reads differently, some to high & some to low & very rarely read the same.

What I always look at is the before & after gains of Dyno runs on the same Dyno, this is the only way to measure the true gains from mods. Always ask for a before & after dyno sheet.

A few questions, was your AIS blocked off during the dyno tune?
I see from your Dyno sheet they set the A/F ratio to between 12.5 & 12.8:1, the 660 motor produces the best torque & HP with an A/F ratio around the 13.2:1 mark. Did the Dyno tunner tune for A/F ratio or max HP & Torque? As 12.5:1 will not produce the MAX HP & Torque.

Leave_it_alone! 14-11-12 19:15
Hi guys, first post and a very happy xtx owner of two days

I have an 04 with micron race cans, decnt filters and a pc111 which has been dyno tuned.

This was all done before i bought the bike second hand


Co was 20, tried 25 which made the surge worse!

Dropping to 18 has made it better, can i go leaner much? No one seems to drop the co, only raise?




Cheers, vince

k.blythe 16-12-12 23:59
i am struggling to find these pictures can anyone help

Kev 17-12-12 22:00
Which pictures are you after?


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