Hey JMo, cheers for the price guide, yeah that was kinda the plan, not sure it'll happen but I like to muse on these things :)

Thanx Kev,

I'll have to put it on the dyno then. For now I'm running with the standard paper filter again.

Yes indeedy, a good mod. Copied it myself today and had a good ride around, mixing urban commuting with motorway blast. Did a plug chop and the condition looked good, so I dont think that the snorkel removal has had much effect on the mixture, but now the bike is breathing colder air rather than the hot jet it was getting down the snorkel. I'll keep an eye on the condition over the next few days and report back to the forum.
Wimpster

Done about 500 mixed miles since I carried out the snorkel removal, and all seems fine. Mixture unchanged, and seems a bit crisper off the throttle low down. Also, you get a nice induction roar as a bonus!!!! So , it would appear to be happy days all round.!!!

Cold air would be more dense than the heated air, so there would be more in the cylinder, thats why an intercooler is fitted to a turbo vehicle to cool the air charge.

Hi Kev

I came across the below link featuring a K&N filter which they state fits the Tenere - I havn't seen it on any of the threads here so would appreciate your thoughts....

http://www.intobikes.co.uk/products/...latest&sd=DESC

I hope that is just a generic photo, as it certainly isn't the drum type of the new Tenere - although they also have the name of the bike wrong (it is a XT660Z Tenere, not an XTZ - that's the old 90's version) - so maybe they have confused and that is a filter for the earlier bike?

xxx

Hi, yes the picture is a generic one....I have this fitted to my 08 tenere, the part number gives a clue to bike fitment.... YA6608 ( Yamaha 660 2008)

Hi, your local Yamaha dealer should have the diagnostic tool, which includes a Co adjustment, it is the same tool used for Raptor 700s. I used this tool on our demo bike with K&N and Akro pipes, and got quite good results!
.

O2 sensor function
 

[quote=Kev;85073]It will only correct the fuel mixture when the O2 sensor is in the closed loop, that is when you are mostly on the cruise & at lower RPM. Other then that it will run a leaner A/F ratio.

Hi Kev,
1/ I would like to ask what do you mean by "closed loop" function of O2 sensor. I assumed, that O2 sensor (lambda) is functional in ALL engine loads and speeds to correct the right A/F ratio - let say "feedback" from exhaust gasess O2 volume analysis - back to ECU, to correct the amount of injected fuel. Could you advise the limiting of O2 sensor function depending on RPM, etc.?
2/ I suppose that O2 sensor is able to correct slightly changed A/F ratio (for example by snorkel removal), but the main issue for me is unknown "range", in which the O2 sensor is possible right correct the A/F ratio (in case of new cans, etc.)
3/ What wil happen with the catalysator in case, that we will change the A/F ratio due to new cans, DNA, etc. - for example by tricking temperature senzor to run more rich fuel?

Thanks, Jiri