Regarding the XTR snatchy fuelling issue:

I have recently returned to the fold with a 2006 XTR. In 2007, I owned a 2004 model. The 04's low speed fuelling was pretty horrible and probably the only thing to spoil an otherwise excellent bike. The 2006 bike is far better in this regard, although not perfect. I understand that Yamaha have improved the fuelling over the years and got it pretty much right from 2007 on (anyone confirm that?). My question is - if I can get hold of a good ECU from a later bike, would it be a straight swap for the 06 unit? And if so, why isn't everyone doing it?

Not an urgent question, as I am quite happy with the bike as it is, but improvements are always good, and having a 'spare' ECU for longer trips would be peace of mind too.

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XT660R (2006)
XT600E (1994)
Triumph Trident 750 (1992)
My blog: http://goingfastgettingnowhere.blogspot.com/

Need the keys and lock set to match for the immobilizer, at least

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you win some, lose some, crash some
K+N filter, snorkel removed, homemade kev mod (with his blessing), co raised,
Pipeworx cans, r1 led back light, under tray removed, small indicators, handguards, cnc short levers,

2006 & 2007 wiring looms are different, a 2007 ECU will not plug into a 2006 loom as the plugs are completely different.

If you are using a new 2007> ECU it will program to a 2006 immob & keys.

After all that you will still need to control the O2 sensor for the 2007> ECU, to do that you will need Dyno jets O2 optimizer or my 2012 O2 controller.

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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

Ah.

Right.

Game, set and match to Yamaha. Thanks for your learned advice chaps. I knew it couldn't be as simple as I thought. Ah well ...

__________________
XT660R (2006)
XT600E (1994)
Triumph Trident 750 (1992)
My blog: http://goingfastgettingnowhere.blogspot.com/