As a newbie, maybe this has been asked before, but we intend travelling through Asia and accross to the UK on 2009 XT660r's (fuel injected). We have done Vietnam and some of Thailand on hire scooters, and some of the fuel is a bit dubious in octane rating, and I know parts of India, Pakistan, etc fuel quality is sus. How do others get by using low octane fuel, I know other XT660R riders have been through there. Octane booster? Any help appreciated.

In my trip two years ago across the northern territory in Australia they only sell OPAL (which stands for something or other) but it was developed so that Aboriginals couldn't sniff it to get high and fry their brain cells. The octane rating is something like 90 (or less) and my XT struggled on it (no guts and ran rough), you end up getting about 1/3 less total range than on premium unleaded.

Thanks Wootonboy, that doesn't sound good. I went through there myself in 07 and 08 on a Harley, it didn't like Opal either, but I put some octane booster in the tank when I filled up, it seemed to help, but I was after a more permanent fix, like some way of changing the timing or something to compensate.

I might be wrong in thinking this would help with octane issues.
A kev fuel mod changes the A/F ratio.
It helped me across spain when the engine would run different up in the hills.
A little tweak to make it run leaner and sorted.

I don't know, does changing A/F help with crap fuel?

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PCV REPLACEMENT ECU WITH 04 WIRING LOOM STAGE1&2DNA GEL SEAT INSERT LOWERED 20mm FRONT+REAR CLUTCH ARM MOD
FORKSPRING SPACERS TALLER SCREEN THROTTLE GRIP CAM MOD DISTANZIAS 46TOOTH REAR SPRKT
SPEEDO HEALER 30MM HANDLEBAR RISERS TOPBOX MOUNT 08 XTX SORTED, ALMOST.
...SHEEPSKIN - Because a pain at the rear is not just a moany pillion.

Hey there,
I rode my XTR through central asia 4 years ago, and the fuel wend down to 83 octane if I recall correctly. I was concerned, but the bike never missed a beat, and had no problems afterwards all the way to New Zealand.
Nick

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Fit an adjustable fuel mod + a O2 controller to richen up the closed loop circuit & you will be fine.

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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 /
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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