Originally Posted by Kev

(QUOTE)

My 2009 XTX has now passed the 600 mile mark and been throught it's expensive 'free' first service. So as soon as I got her back home I started adding the mods i'd been hoarding over the last few weeks. She now sports a loud and light set of Leovince cans, a DNA stage 2 filter and one of WB's tail tidys. Now my limited technical knowledge suggests that with the cans and air filter installed the bike will suck in and blow out more air True, thus making her run leaner than stock true. Will the lambda sensor adjust this automatically? No it won't, the O2 sensor is a emission control device not a tuning device. The O2 sensor will run the A/F ratio at 14.7:1 in the closed loop ciruit, you need around the 13:1 to get good fuel consumption & HP for your mods.

I think it will, but don't fancy having to replace pistons and valves if it doesn't! We have no reported damage from this set up on any XT over the past 4 years but this set up does run lean. It is best to fit a Power Commander with a custom fuel map made on a dyno There is no money left on the kitty for other mods just at the moment. May be look at a cheap fuel mod.

PCV with AUTO tune. http://www.morepoweracing.com/l97xvp...4-26977-45185/
Power Commander III . http://www.powercommander.com/powerc...b/default.aspx
Power Commander V http://www.motorcycle-exhausts.co.uk...oducts_id=8562
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 > http://www.xt660.com/site/node/136 Made to order for all year & model XT660X/R/Z
G.P.R. http://www.gpr.it/prodotti.php?id=14