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- Fuelling and Intake ( https://www.xt660.com/forumdisplay.php?f=207)

- - Fuelling Fix ( https://www.xt660.com/showthread.php?t=55)

Kev thanks, I understand everything!!!!!!!!!!!!!!!

Quote:

Originally Posted by Kev (Post 1159)

Something else I have done is disconnect the engine breather pipe from the airbox. Blocked the airbox side, fitted a L pipe to the existing pipe, connected a new 13mm ID pipe to the L pipe & routed the pipe down between the swinging arm & the motor. You can get a plastic L pipe from the local hardware shop, irrigation section.

This is so you get pure air into the airbox & not rebreathed engine fumes. Better Air more power.

They only do this for emission control.

on all our off road Bike's we lift the engine breather into the air box.
some bike's have been knowen to suck water up this pipe when the engine is stalled when crossing water .

could this be a problemif off roading the XT ?

Quote:

Originally Posted by dazzerrtw (Post 55390)

If you run the pipe to the top of the airbox on the outside of the airbox you will be ok. If water enters the pipe up there the bike would full the airbox anyway.

I am now running a modified pvc valve on mine. So nothing can enter that pipe as it is a one way valve out only. You could use one of these valves if you want.

Hello, this is my first post on this forum, i just bought my xt660x -07 yesterday and was wondering if i can adjust the CO on mine aswell, or is it only before -07?

Thanks, /s

Edit: To clear things up: It got a K&N filter and 2 Leovince slip-ons, and i don't think the previous owner have done this.

Yes the 07/08 can have there CO1 adjustments altered.

http://www.xt660.com/showthread.php?t=630

Also welcome to the forum.

Quote:

Originally Posted by Kev (Post 66560)

Yes the 07/08 can have there CO1 adjustments altered.

http://www.xt660.com/showthread.php?t=630

Also welcome to the forum.

Thank you =)

Quick Question regarding CO1 settings. I bought a second hand 07 xtr. I was wondering how I would tell if someone has already changed the CO setting? Is there a way of finding out what this specific bike was set to out of the factory? (Sorry if this is in the wrong place)

Most are between -5 & 20.

Thanks Kev, yes mine is at 20

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.

what standard adjust co on xtx