Greetings all, I'm new here.
I've just picked up a 2006 single spark and a 2007 twin spark XT660R.
Having avoided the "evils" of EFI for as long as possible, the impending ULEZ in London and the roll out of similar schemes in other Northern cities means I've decided to get rid of my fleet of six RFVC Hondas, with their carburettors and Euro 2 compliance, before the value starts to plummet (as is happening with diesel cars over here).
I use bikes as my sole transport and ride about 18K miles a year. I keep them as standard as possible as I've found that's the way to keep them reliable. That said a nice set of cans goes a long way!

Hello and welcome.
What's twin spark about a 2007 xtr?

Colin J

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2011 xt660z.
Yoshimura cans ,kev mod,Dna 2, Stahlkoffer panniers,Hepco Becker box,Givi crash bars,Mita e07 tyres.

Hello and welcome along

Welcome mate.

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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

Welcome to the wonderfull world of XT'S...Let the fettling and modding begin...you have been warned.

Welcome to the forum! Steve

Well I stand to be corrected, but I thought the 2007 XTR gained an O2 sensor and an extra spark?
I haven't received either machine yet (next Saturday) so I guess I'll find out then!

I'll be hitting the green lanes first thing.

Yes, an 02 sensor was fitted from all 2007 production onward

No, twin spark, not the case.

and to

Oh, right you are.
That's good news then, I'm looking at the 2006 bike as a workhorse to do the commute and high mileage runs and eventually act as spares for the "nice one" (the 2007) bike.
TBH I didn't realise the two were different (should've done more research), so the fewer differences between them the better.

Thanks for all the greets.

In a nutshell, from 06 to 07 the differences are as follows:

1) 02 sensor / Lambda probe fitted to left header
2) redesigned rear swing arm, easier on the eye than the previous box section one and with a better chain tension system, lighter and stiffer than the previous one due to different alloy used instead of S/Steel.
3) redesigned front light cowling
4) new tank plastic panels
5) smaller radiator
6) new black fork legs with a redesigned front attachment due to previous cracking by the axle clamps.

Can't think of anything else, it's been so long