Hi guys,

Tried to find some information on dealing with high altitude but couldn't find anything so apologies if I've missed it.

We're currently on 2 '07 XT660R's and have made it to Kashgar having crossed the 3750m Torugart pass. The bikes aren't liking the altitude too much and tend to stall in 1st gear. We're slightly concerned as tomorrow we're heading for the Kunjerab Pass which at 4755m is a full km higher.

We're both running Metal Mule exhausts (one newer with the lamda on it and the other without - we bought the O2 sensor from someone on this forum.) and long ago followed the instructions on here to make the bike run richer.

My question is, what should we be doing to help the engine deal with the altitude?

Any help much appreciated!

get more oxygen into it!or lean the mixture if you can.
try removing part of the airbox????? you need Kevs advise lol, not mine!!

Fit a turbo, that'd get more air in

Seriously though, you've got a choice of either leaning the mixture out to correct the AFR or..
find a way of getting more air into the engine.

Obviously, where you are, you're in no position to fit a stage 2 or anything like that so either snorkal removage or lean out whatever fuel mod you've got fitted.

Failing that, I'd also be inclined to check the main air filter, make sure it's not full of crap because that wouldn't help matters either.

If you're not bothered about noise, remove any DB killers in the exhaust too as they'd help the engine breathe a little better and let more air through it.

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.

Riding in high altitudes, i set the CO� back to factory settings and turn KEV-MOD to 0.
Do run a DNA Stage2 though.
Remove snorkel, check/clean/change airfilter, remove the mesh on the clean side of the filter, re-route engine breather away from airbox (clog the air-box conection)

just 2 weeks ago did about 5.000mtr with pilion - no problems!

http://picasaweb.google.de/torque62/...0km1118082010#
(Fotos 57 -68)

salu2,
Joe

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Saludos,
Joe
http://web538.ypsilon.ibone.ch/index...d=89&Itemid=42

neoprene fork protectors Acerbis / blue Puig wind shield / fork spacers 24mm / snorkel and resonater out / Acerbis hand protectors / 25 mm bar risers / 12 V outlet / "soft throttel mod" / engine protector home made / PC III USB / DNA ST2 / K&N ST 1 / BSM "Future extreme" exhaust / Wilbers "Adjustline" Shock / XTX links / luggage carrier home made / automatic chain oiler home made

thanks guys,

ended up just leaning the CO mix on both bikes and fully loaded they both cruised to 5000m without nissing a beat (unlike the transalp in the group which got towed up the last 500m!

if you hadn't removed lambda sensors you wouldn't have to do a thing.

If you are using more than 20% throttle the closed loop circuit is not in use, so the O2 sensor would have no bearing on the fuel mixture at all.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946